Training Manual
This document was uploaded by user and they confirmed that they have the permission to share it. If you are author or own the copyright of this book, please report to us by using this DMCA report form. Report DMCA
Overview
Download & View Training Manual as PDF for free.
More details
- Words: 8,469
- Pages: 54
Training Manual
KLV-32M1 KLV-26HG2
LCD Direct-View Televisions Theory of Operation and Troubleshooting Course: CTV-35
KDL-32/42XBR950
Table of Contents Introduction .......................................................................... 1
Chapter 3 - KLV-26HG2 Troubleshooting Flowcharts..... 14
Course Overview ............................................................. 1
Initial Contact Flowchart A ............................................. 14 Power-ON Troubleshooting Flowchart B ....................... 15 Protection Mode Troubleshooting Flowchart C1............ 16 Protection Mode Troubleshooting Flowchart C2............ 17 No Video Troubleshooting Flowchart D ......................... 18 Video Distortion Troubleshooting Flowchart E ............... 19 No Audio Troubleshooting Flowchart F.......................... 20
Chapter 1 - Basic LCD Display Theory ............................. 2 Basic Operation of an LCD Projection Television ............ 2 Overview.......................................................................... 2 Liquid Crystal Technology ................................................ 2 Light Polarization ................................................................. 2 Liquid Crystals ..................................................................... 3 Creating Color With Liquid Crystals ..................................... 4 Direct-View LCD .................................................................. 5
Chapter 2 - LCD Display Troubleshooting ........................ 6 Introduction ...................................................................... 6 Video Abnormalities Troubleshooting .............................. 7 No video .......................................................................... 7 Backlighting ......................................................................... 7 No Video with Backlighting .................................................. 7
Distorted Video ................................................................ 8 Rows or Columns of Pixels Lit or Unlit................................. 8 Digital Distortion Entire Screen .......................................... 10 Improper Video Level..........................................................11
White Balance ................................................................11 Adjusting White Balance .....................................................11 Adjusting White Balance Without a Color Analyzer ........... 12
CTV-33
Chapter 4 - KLV-32M1 Troubleshooting Flowcharts ....... 21 Initial Contact Flowchart A ............................................. 21 Power-ON Troubleshooting Flowchart B ....................... 22 Protection Mode Troubleshooting Flowchart C1............ 23 Protection Mode Troubleshooting Flowchart C2............ 24 No Video Troubleshooting Flowchart D ......................... 25 Video Distortion Troubleshooting Flowchart E ............... 26 No Audio Troubleshooting Flowchart F.......................... 27 Chapter 5 - KDL-32/42XBR950 Troubleshooting Flowcharts .............................................................................. 28 Initial Contact Flowchart A ............................................. 28 No Power Troubleshooting Flowchart B ........................ 29 Protection Mode Troubleshooting Flowchart C.............. 30 Video Troubleshooting Flowchart D ............................... 31 Audio Troubleshooting Flowchart E ............................... 32
i
Table of Contents
Appendix............................................................................... 1
Overall System Block Diagram .......................................... 16
KLV-26HG2 LCD Panel & Board Part# per Unit Serial Number ........................................................................ 1 KLV-26HG2 LCD Panel & Board Part# per Unit Serial Number Cont. .............................................................. 2 KLV-26HG2 Board Location ............................................ 3 KLV-32M1 Board Location ............................................... 4 KDL-32/42XBR950 Panel Board Location....................... 5 KLV-26HG2 Protection Mode Indications and Failure Areas ............................................................................... 6 KLV-32M1 Protection Mode Indications and Failure Areas 6 KDL-32/42XBR950 Protection Mode Indications and Failure Areas ..................................................................... 7 KLV-26HG2 Block Diagrams ........................................... 8
LCD Panel Power Supply .................................................. 17 Audio Processing .............................................................. 18
Power Supply....................................................................... 8 Protection Circuits................................................................ 9 Video Processing ............................................................... 10 Audio Processing ................................................................11
KLV-32M1 Block Diagrams ............................................ 12 Power Supply..................................................................... 12 Protection Circuits.............................................................. 13 Video Processing ............................................................... 14 Audio Processing ............................................................... 15
KDV-32/42XBR950 Block Diagrams.............................. 16
CTV-33
ii
Introduction Course Overview The main concept behind this course is to develop a working (or basic) understanding of the Liquid Crystal Display (LCD) technology, and combine this knowledge with the simplified flowchart type troubleshooting procedures to effectively and efficiently service and repair Sony LCD direct view television products. With this concept in mind the sequence of this training manual is laid out as follows. The training manual starts with Chapter 1 providing the basic explanations and illustrations of the LCD technology. The theoretical knowledge gained from this information will prove to be extremely helpful in understanding why and how possible defects can occur. Chapter 2 is a natural extension of chapter 1, in that it provides descriptions and illustrations of real life defects that can occur in LCD base products. These are general (not model specific) defects that can occur in any LCD base product. Chapters 3, 4, and 5 provide model specific flowchart type troubleshooting procedures. These flowcharts are base on board level troubleshooting. However, in some cases they will direct the troubleshooter to a possible defective component. Keep in mind while reading this training manual that if a particular defect scenario is not covered, there is detailed training manuals developed for each model cover in this manual. Go to the Sony ESI web site and search the training web page for the model specific training manual for detailed component and board level troubleshooting procedures. Models Cover in this manual: KLV-26HG2
KDL-32XBR950
KLV-32M1
KDL-42XBR950
CTV-35
1
Chapter 1 - Basic LCD Display Theory Basic Operation of Liquid Crystal Display (LCD)
Liquid Crystal Technology Three items are required for and LCD display to function: A backlight source, polarizing of the light source, and liquid crystals to manipulate the polarizations of this light.
Overview Projection television displays utilizing LCD technology have been around on mass production scale for about 16 years. During most of this time period the devices were front-type projection units. The display unit was mounted on a table or hung from a ceiling to be projected to a wall or screen. This sufficed for most commercial applications and in some home use. Recent years have seen an explosion in the number of rear-type LCD projection televisions. Their all-in-one design eliminates the need for unsightly equipment and wires normally found in front projection setups. Advances in screen design have allowed the new rear-projection televisions to generate bright, crisp video with improved viewing angles that rivals front projection devices. Geometric distortion and convergence issues are virtually non-existent.
Light Polarization In Figure 1-1, an example of how light is affected by polarizing filters is shown. Normal light can be transmitted anywhere along a 360-degree plane. This is especially true for scattered light being reflected off of random surfaces. This is why polarizing sunglasses are so effective. In this example, a polarizing filter that only allows light on a vertical plane is used to filter the incoming backlight. If another filter is placed in front, allowing only horizontal phased light to pass, the light is effectively blocked. LCD devices use this basic principle to control the amount of light passing through.
This chapter will cover the basics of the LCD display technology used in today’s products. All of the items discussed can be applied to Front Projection, Rear Projection, and Direct-View LCD display units. The video process circuits and light box assemblies function the same way. The only difference between the two is how the generated image is projected. Since most homes will have the rear projection unit, the descriptions to follow will focus on them.
FIGURE 1-1 PLOARIZING FILTERS CTV-35
2
1. Basic LCD Television
Liquid Crystals Although liquid crystals come in many different forms, the key difference between the types is the arrangement of the crystals. Some have randomly arranged crystals while others are arranged in a specific pattern. Other differences include how they react to temperature, pressure, magnetic fields, and electrical current. The crystals used in LCD display devices are know as “chiral nematic”. As the crystals are arranged in layers, the crystals naturally twist slightly with each subsequent layer. Layers can be added until the crystals complete a 90-degree “twist”. This twist in the crystalline structure can be used to take a certain polarized light and shift its phase accordingly. The other characteristic of a nematic-type crystal is it ability to react to an electric potential. If an electrical potential is applied to the crystal layers, the twisted crystals will begin to “un-twist” in an amount proportionate to electrical potential until, when enough potential is reached, they line up perfectly. This is how liquid crystals are used to control light and generate images on a display device.
FIGURE 1-2 LIQUID CRYSTAL EFFECT ON POLARIZED LIGHT
Figure 1-2 illustrates how the naturally occurring twist in the crystalline layer rotates the incoming polarized light to match the polarized plane of the second filter. In this normal state, the crystals rotate the polarized light 90-degrees to match the plane of the outgoing polarizing filter allowing the backlight to pass through. In Figure 1-3, an electrical potential is applied to fully “un-twist” the crystals. The polarized backlight is now perpendicular to the outgoing filter and no light will pass. By varying this electrical potential, the amount of effect on the twisted crystals can be altered to a point where linear control of light output is achieved.
FIGURE 1-3 VOLTAGE EFFECT ON LIQUID CRYSTALS
CTV-35
3
1. Basic LCD Television
Creating Color With Liquid Crystals All that is required for LCD pixels to create color is to place a color filter in front of each pixel. By using red, green, and blue color filters, the required primary colors are generated to produce the millions of color variations needed for graphics and video display. Modern LCD technology uses what is known as Thin-Film Transistor (TFT) technology. Each pixel has its own transistor and capacitor, which increase the contrast rating of the LCD due to the increased retention of charge. This helps to dramatically increase the response time for each pixel as they are scanned. Control of each pixel is simply a matter of addressing a particular column and individually activating each pixel in that row with a properly timed address pulse on the horizontal plane. The higher the pulse level, the more the crystals align, producing a lower light output. Figure 1-4 illustrates how color filters and TFT devices are used.
FIGURE 1-4 TFT/LCD TECHNOLOGY CTV-35
4
1. Basic LCD Television
Direct-View LCD This type of display device uses the methods described previously to generate video by placing vertical columns of red, green, and blue filters over a liquid crystal layer. Thin-Film Transistors control the amount of light passing through each pixel. The light source is generated behind the LCD array. Fluorescent lamps are the most common to use. A diffuser plate distributes the light from the lamps to provide uniform brightness to all areas of the screen. A polarizing sheet is installed next to allow only one plane of light to pass. This light enters the LCD structure and is twisted 90degrees. Another polarizing sheet is placed in front of the pixels at exactly 90 degrees. With no voltage present to “twist” the crystals into alignment, full passage of the backlighting is allowed. Control of the light output from each pixel is now possible by scanning the matrix of pixels using carefully timed pulses at the horizontal and vertical planes of the columns and rows. Figure 1-5 illustrates a typical LCD panel.
FIGURE 1-4 TYPICAL DIRECT-VIEW LCD PANEL CTV-35
5
Chapter 2 - LCD Display Troubleshooting Introduction This chapter will cover issues that are unique to LCD display designs. The troubleshooting procedures will be structured so as to provide the best generic approach to isolating the cause of the failure. Most repairs are performed by replacing circuit boards. This is especially true for units that are in warranty since the service policies forbid component level servicing in almost all cases. The video and audio processing circuits are virtually identical to those used in other display devices (e.g. CRT and Plasma). Particular attention will be given to the circuits that control and drive the panel. The Key components common to all LCD displays include the LCD panel assembly (there will be 3 of them in a projection unit), a method of passing back lighting through the LCD crystals, and circuits to scale the incoming video data to the resolution of the panel. Regardless of the signal source, the video signal is in a digital format. All analog signal sources are digitized by the initial video process circuits. LCD panels can only accept digital signals. Most designs accept the individual RGB components in an 8 or 10-bit word size. The RGB signal will have been scaled to meet the fixed resolution of the panel. This digital RGB data is allocated to the correct pixel position on the panel by the panel logic circuit.
lighting on the panel. Tips will be provided later in this chapter to point out some of the unique symptoms of panel-caused distortions versus those that are usually seen when the video process circuits are at fault. Other failures can occur such as a unit that will not turn on or turns its self off for protection purposes. The latter will usually generate a diagnostic indication that may help in determining what the cause is. Failure of the audio processing and amplifying circuits must also be considered. All of the previously mentioned items are diagnosed in different ways that are unique to the chassis/model design. This chapter is geared towards generic approaches to servicing LCD televisions. Additional chapters in this manual will contain troubleshooting flowcharts specifically tailored for a model or group of models. Diagnostics procedures that are unique to specific models are best followed with troubleshooting flowcharts specific to them. This manual will contain such charts located in individual chapters labeled with the model or chassis they are designed for.
Failures occurring with the LCD panel itself or the above mentioned circuits usually manifest themselves in an easily recognizable symptom. The most common are: •
No picture
•
Missing or fully lit horizontal lines (individually or in groups)
•
Missing or fully lit vertical lines (individually or in groups)
•
Distortion in the displayed video
This last bullet can be more difficult to discern since the distortion can be caused by the video process circuits rather than those used to control pixel
CTV-35
6
2. LCD Television Troubleshooting
Video Abnormalities Troubleshooting
Backlighting
Video abnormalities can be anything from no video at all, missing lines or sections, unwanted pixel lighting, and severe to subtle distortions. The different scenarios that might be encountered will be classified and practical approaches applied.
All LCD televisions, whether a direct-view or projection type, require a light source be present to pass through the LCD crystals and out to the viewer. In direct-view units the current choice is multiple fluorescent tube lamps whose light output is spread by a diffuser panel. Projection units utilize a high-intensity lamp. In Sony LCD projection units, the lamp light is split into red, green, and blue light components. These light components are sent to individual LCD panels for pixel control and recombined for projection to a screen.
No video
A true “no video” condition assumes that none of the various inputs or tuner sources are displaying a picture. As mentioned earlier, it is important to immediately isolate the cause and determine if it lies within the video process or the panel control circuits. All Sony televisions generate what is known as “On Screen Display” graphics (OSD). Any display of on-screen graphics (such as channel, video input numbers, or customer setup menus) immediately disqualifies the panel and the drive circuits as the cause. On-screen graphics can be a powerful troubleshooting tool but its use is unique to the design of the unit. A flowchart specific to that chassis/ model should be used.
Since current LCD technology is unable to completely block backlighting, a small amount of light passes through the LCD crystals and can be seen as a dark gray raster. Ambient room lighting will determine how easy this is to see. In most cases it is easier to watch the screen as the unit is being turned off to see if the raster becomes slightly darker. All Sony LCD televisions contain protection circuits to monitor the circuits driving the backlight lamps. If the ballast control circuits or the lamp(s) fail, the unit will usually shut down and display a diagnostics indication. How this is done is unique to each model. Utilizing a troubleshooting flowchart for that specific model is the best way to isolate the cause. Verification of backlighting should always be the first step in isolating a “no video” condition regardless of the presence of protection circuits.
No Video with Backlighting If backlighting is confirmed, the next step is to observe for the presence of any on-screen display (OSD) graphics. These are generated by the main microprocessor or video process circuits. The presence of OSD is a clear indicator that the LCD panel and its associated drive circuits are functioning. The focus of attention is now in the video input and process circuits. Use a troubleshooting flowchart for the specific model to assist in isolating the problem.
CTV-35
7
2. LCD Television Troubleshooting
Distorted Video
Rows or Columns of Pixels Lit or Unlit
Distortions in the video can be a difficult challenge since it can manifest itself in many ways. Fortunately, many of the distortion issues that are caused by the panel control and driver circuits are unique and usually easy to identify. Distortions can be classified into the following groups:
Fully lit rows or columns of pixels are more common in LCD panels than ones that are not lit at all. The horizontal and vertical address lines are controlled by drive circuits that are linked to the panel via flexible PC cables. These cables are bonded to the outer edge of the panel. If the bond is lost at one or more of the lines, the control voltage will be lost. This allows the liquid crystals to twist to their normal position and allow full light to pass through. Since an entire line is affected all of the red, green, or blue pixels will light. This is a clear indication of a panel failure since very expensive and specialized equipment is needed to repair the bond. Any unit under warranty will need to have the panel replaced. Figure 2-1 illustrates and example of this failure.
•
Unlit or fully lit rows or columns of pixels
•
Digital distortion across the screen
•
Improper video level
•
Dark or colored spots on the screen
Current Sony policy dictates the entire unit be exchanged for direct-view models. On larger LCD panels, policy changes may occur, allowing the replacement of the defective panel in the field. Always review the current service policy for a particular model by visiting the ESI website.
CTV-35
8
2. LCD Television Troubleshooting
FIGURE 2-1 SAMPLE OF LCD PANEL FAILURES CTV-35
9
2. LCD Television Troubleshooting
Digital Distortion Entire Screen Unless the LCD panel has been damaged in any way, this type of distortion is usually caused by the process circuits for the video signal. The proper step is to isolate the cause to a particular board. The two key circuits for processing video are the initial circuits to perform analog to digital conversion, and another to scale the incoming video data to the panel resolution and allocate that information to the proper pixels. Distortions caused by digital process circuits are unique and, in most cases, easy to identify as to the source. Random points of pixel lighting and loss of detail in the displayed image are examples of distortion caused by the initial video process stages. If this happens, using the OSD functions of the unit can help to verify this. OSD is usually inserted near the end of the digital processing, before it enters the panel scaling circuits. Figure 22 illustrates an example of a digital process failure in the front end of the process circuits. Note how the OSD is unaffected. The OSD has made it clear that there is nothing wrong with the panel or the scaling and drive circuits. Distortions caused by the scaling and panel drive circuits usually generate symmetrical patterns. Erroneous highlight and black level can also occur here since gamma correction is performed at this stage.
FIGURE 2-2 DIC2 CIRCUIT FAILURE
CTV-35
10
2. LCD Television Troubleshooting
Improper Video Level
White Balance
Video level issues can affect one or all of the primary colors. The panel scaling and control circuits are reliant on the initial video process stages to properly reproduce brightness and contrast levels. If an overall picture level problem occurs with white balance appearing normal, suspect the failure in the initial video stages. It is not likely that a failure in the gamma correction or LCD drive circuits will affect all three colors.
White balance adjustments are provided to vary the output level of the red, green, and blue LCD panels to achieve proper gray-scale of the displayed image. In a direct-view LCD television, the level of each red, green, and blue pixels are varied. Most Sony televisions have more than one white balance setting. Three are most common. They are: Cool, Neutral, and Warm.
In situations where one color is at a level so as to affect white balance, the problem can be in the initial video stages or in the panel. White balance shifts on direct-LCD units are not common. If the entire range of a particular color has increased or decreased suspect a problem in the initial video stages since this is where these adjustments are located and stored on to non-volatile memory. Gamma shifts or failures usually cause white balance problems at the extreme low or highlight areas of a particular color.
Neutral is a “true” white balance. If a test pattern were to be displayed using a “stair-step” pattern from full white to black, all of the brightness levels of the scale would be true black, white and gray. The “Cool” setting adds a small amount of blue to give the picture a “hot” look. “Warm” contains a small amount of red to soften the intensity of the picture.
White balance issues with a projection LCD unit are approached in an entirely different manner. Since 3 separate LCD panels are used, it is possible for white balance issues to occur that is not electrical in nature. If drive to one LCD panel were to fail, the symptom would be an extreme white balance shift towards the particular color of the panel that lost drive. Likewise, damage, dust or aging of polarizing filters could cause a drop in one or more of the primary colors.
Adjusting of white balance is only required if the unit has had a board replacement in which the circuits controlling the balance are located. Other situations where white balance will require adjustment include aging of the unit through time, or when someone else has changed the settings.
Adjusting White Balance The proper procedure for adjusting white balance is covered in the service manual for each model. A color analyzer is required to properly set the X and Y values of each of the color temperature settings. The steps required to perform this adjustment varies from model to model. It also varies between a direct-view and projection unit. Because of this, it would be impossible to cover the requirements in a general sense. Each type of unit has a unique procedure for the initial setting of brightness, contrast, and what color temperature to start with. Some direct-view LCD models have an adjustable backlight that must be set to a certain level. The procedure for reading color balance from the screen also varies for a projection or direct-view model. Many technicians will not have the luxury of carrying a color analyzer. They are expensive ($4000 and up) and require training to use properly. In cases where color balance must be adjusted and an analyzer is simply
CTV-35
11
2. LCD Television Troubleshooting not available, there is a procedure that can be performed that will produce satisfactory results. Although not nearly as accurate, it is better that not doing the adjustment at all. This procedure should only be done if it is absolutely necessary and a color analyzer cannot be acquired.
Adjusting White Balance Without a Color Analyzer In cases where a color analyzer is not available, white balance can be aligned by eye. Technicians who are experienced with adjusting CRTbased displays will be familiar with this procedure. They are similar except that CRT’s require that the G2 grid (screen) be adjusted to the point of stopping the electron emissions from the cathode at reference black. Drive controls are then adjusted to make each cathode emit the proper level of electrons at high brightness to achieve a white raster. When adjusting an LCD display, there are no cutoff adjustments. In this particular model, the Sub-Contrast adjustments are used to adjust white balance for the bright areas of the screen. The Sub-Brightness adjustments are set for the low-level brightness areas. The best test pattern to use when visually adjusting white balance is a monochrome stair-step pattern versus a 100IRE white screen. This provides a view throughout the range of brightness levels the display will generate. Another significant difference in the adjustment procedure is starting with the “Neutral” picture setting. The “Warm” setting shifts the white balance towards the red end of the scale whereas the “Cool” setting shifts towards the blue spectrum. By using “Neutral”, the white balance can be adjusted visually. This provides a reference for the eye so that the “Cool” mode can be set with the Blue Sub-Brightness and Contrast increased slightly to boost the color temperature to around 9300K. The “Warm” setting will have more Red Sub-Brightness and Contrast levels to create a white balance in the 6500K range. “Neutral” should fall into the 8000K level. Be certain to leave the low-bit data settings for the Green Sub-Brightness
CTV-35
and Contrast to zero. The high-bit data should be in the mid range. Adjust the Blue and Red data to achieve white by adding these colors to the green. The following procedure can be used for a unit when the white balance is significantly off: 1. With the unit in “Neutral”, set the brightness level to one-third and the picture level to two-thirds. Input a monochrome stair-step pattern with at least 75IRE at the highest white level. 2. Check that the Green Sub-Contrast and Brightness levels are set to mid-range for the upper-bit data and zero for the lower-bit data. 3. Set the Red upper-bit data for Sub-Contrast and Brightness to mid-range and the lower-bit data to mid-range. 4. Set the Blue upper-bit and lower-bit data for Sub-Contrast and Brightness to zero. The picture will now be a yellowish/green. 5. Adjust the Red Sub-Contrast Low to generate a yellow color at the brightest portion of the test pattern. If you find that you are reaching the extreme end of the data range (0 – 255), set the Red Sub-Contrast High up or down one number and try again. 6. Once the bright video level is closest to yellow as possible, repeat the above procedure for the Red Sub-brightness adjustments. 7. When satisfactory yellow is achieved throughout the video range, set the high-bit data for Blue Sub-Contrast and Brightness to midrange. Adjust the low-bit data for each to change the yellow screen to white. If you are at either of the extreme ends of the data ranges (0 – 255), set the upper-bit data up or down accordingly. 8. Once the “Neutral” white balance is satisfactory, adjust the “Warm” white balance in the same way. Add a small amount of extra Red Sub-Contrast and Brightness. “Cool” is adjusted adding a small amount of extra Blue Sub-Contrast and Brightness data. Although the above procedure can be somewhat subjective, it has worked
12
2. LCD Television Troubleshooting rather well for CRT-based consumer televisions for many years. It is a viable alternative when a color analyzer is impossible to acquire.
CTV-35
13
Chapter 3 - KLV-26HG2 Troubleshooting Flowcharts Initial Contact Flowchart A
KLV-26HG2 Index Troubleshooting Flowchart A
A Start Initial Analysis
Does unit Turn ON?
No
GO TO Power-ON Troubleshooting Flowchart B
Yes
Is RED LED Flashing? Red LED ON in Standby Green LED flashes and Glows Steady
Yes
GO TO Protection Mode Troubleshooting Flowchart C1, 2, 3
No
Is Video Present? Yes
Is Video Distorted?
Yes
GO TO Video Distortion Troubleshooting Flowchart E
No
No
GO TO No Video Troubleshooting Flowchart D
Is Audio Present?
No
GO TO No Audio Troubleshooting Flowchart F
Yes
GO HOME No Problem Found Unit Fully Operational
CTV-35
14
3. KLV-26HG2 Troubleshooting Flowcharts
Power-ON Troubleshooting Flowchart B KLV-26HG2 Power-ON Troubleshooting Flowchart B B Unit will Not Turn- ON (No Power)
Is RED LED ON?
Press TV POWER Button (Not RemoteControl)
G1-Board
Check Voltage at CN6006/ Pin 1
Press TV or RemoteConrol POWER Button
Does GREEN LED light?
Replace B-Board
Replace G1-Board
No
Yes
Does GREEN LED remain ON?
A1-Board Yes
Check voltage at CN4603/Pin 11
G1-Board
RED LED is Flashing 1.5sec. ON 0.5sec. OFF
Replace B-Board
Is voltage Panel 12V Present?
Yes
Initial Power OK Troubleshoot Video, Panel, or Audio Problem
No
No
IMPORTANT LCD Panel and Board part numbers are serial number dependent. Go to appendix and reference serial number range for proper part number of component .
Yes
No
No
Yes
Is voltage STBY 5V Present?
Check Voltage at CN6006/Pin 3
No
Is voltage 3.2V Present? Yes
Check Voltage at CN2801/Pin 23
Is voltage 3.2V Present?
A1-Board
Replace B-Board
Replace A1-Board
Replace G1-Board
CTV-35
15
3. KLV-26HG2 Troubleshooting Flowcharts
Protection Mode Troubleshooting Flowchart C1
KLV-26HG2 Protection Mode Troubleshooting Flowchart C-1 C-1 Unit Shuts OFF RED LED Flashing
NOTE: All voltages are measured prior to unit shutdown
2sec. ON 2sec . OFF LCD Drive
0.5sec. ON 1.5sec . OFF LCD Panel
G1-Board
Check Voltage At CN6003/ Pins 13
Is Voltage 16.5V Present?
B-Board
Yes
Check Voltage At CN4603/ Pin 24
Check Voltages At CN1003/Pins 18 & 22-25
Are voltages Pin 18 - 5V Pins 22-25 - 3.3V Present?
A1-Board
No
Replace G1-Board
IMPORTANT LCD Panel and Board part numbers are serial number dependent. Go to appendix and reference serial number range for proper part number of component.
Yes Is Voltage 3.3V Present?
No
Replace B-Board
Replace B-Board
No
Replace A1-Board NOTE: Confirm Power Supply operation on both the G1 & A1 boards reference Flowchart B
Yes
Replace LCD Panel Assembly
CTV-35
16
3. KLV-26HG2 Troubleshooting Flowcharts
Protection Mode Troubleshooting Flowchart C2 IMPORTANT LCD Panel and Board part numbers are serial number dependent. Go to appendix and reference serial number range for proper part number of component .
NOTE: Check that the TV is not near other devices that may cause a rise in temperature. Such as, home heating systems.
KLV-26HG2 Protection Mode Troubleshooting Flowchart C-2
C-2 Unit Shuts OFF RED LED Flashing
NOTE: All voltages are measured prior to unit shutdown
1sec. ON 1sec. OFF Temperature
1.5sec . ON 0.5sec. OFF Power Supply
Confirm acceptable local external environment temperature
Check Voltage at CN6003/ Pin 13
Is temperature < 75 degrees Celsius Present?
G1-Board
No
Move TV into an acceptable environment and Re-Test
Is Voltage 16.5V Present?
Normal temperature to Yes the touch
Replace B-Board
No
Replace G1-Board
A1-Board
Check Voltage at CN4601/ Pins 5-7
Is voltage 6.8V Present? Yes
CTV-35
Is voltage 3V Present?
Yes
Yes Excessive temperature to the touch Is Replace Temperature No of LCD Panel LCD Panel only warm to the Assembly touch?
Check Voltage at CN4603/ Pin 20
Replace G1-Board
No
Replace A1-Board
Yes Check Voltage at CN4603/ Pin 19
Is voltage 2.75V Present? No
A1-Board
A1-Board
No
Replace A1-Board
Yes
Replace B-Board
17
3. KLV-26HG2 Troubleshooting Flowcharts
No Video Troubleshooting Flowchart D
D
KLV-26HG2 No Video Troubleshooting Flowchart D
No Video
Is Video Missing on All Inputs ? 1,2,3 etc.
Check Memory Stick Input
Yes
Is Voltage 12V Present?
No
Is Video or Pictures Displayed?
Check External Device and Separate Connections Swap Devices and Connections
Yes
Replace A1-Board
Are External Devices and Connections OK?
Does User Menu Display?
No
G1-Board
Check Voltage at CN6003/ Pins 5-7
No
B-Board
Replace A1-Board
CTV-35
Yes
Is Voltage 6V Present?
No
Check Voltage at CN5801/ Pins 1&2
No
Replace A1-Board
Yes
Check LVDS Cable Connections between B Board & LCD Panel Assb.
No
Turn ON User Menu TV OK Repair External Yes Devices or Connections and Re-Test
IMPORTANT LCD Panel and Board part numbers are serial number dependent. Go to appendix and reference serial number range for proper part number of component.
Yes
Replace B-Board
LVDS Cable Connections OK?
No
Repair LVDS Cable Connection and Re-Test
Yes
Replace LCD Panel Assembly
Replace G1-Board
18
3. KLV-26HG2 Troubleshooting Flowcharts
Video Distortion Troubleshooting Flowchart E
KLV-26HG2 Video Distortion Troubleshooting Flowchart E E Video Distorted
Check Memory Stick Input
Is Distortion on All Video Inputs ? 1,2,3 etc.
Yes
Replace A1-Board
No
TV OK Repair External Bad Devices or Connections
No
Is Memory Stick Video or Pictures Distorted? Yes
Turn ON USER MENU
Check External Device and Connections Swap Devices and connections
Replace B-Board
Good
No
Is Distortion in USER MENU?
Yes Video 1, 2 Distorted Video 3, 4 OK
Replace B-Board
CTV-35
Video 1, 2 OK Video 3, 4 Distorted
Replace A1-Board
Is Distortion Stationary Missing Horizontal or Vertical Lines. Or Missing Pixels?
No
Replace B-Board
Yes
Replace LCD Panel Assembly
IMPORTANT LCD Panel and Board part numbers are serial number dependent. Go to appendix and reference serial number range for proper part number of component.
19
3. KLV-26HG2 Troubleshooting Flowcharts
No Audio Troubleshooting Flowchart F
KLV-26HG2 No Audio Troubleshooting Flowchart F
F NOTE: Confirm all DC Voltages to circuit boards before replacing
No Audio (Speaker Outputs)
Is Audio Missing on All Inputs ? 1,2,3 etc.
No
Check External Devices and Connections Swap Devices and connections
Bad
TV OK Repair External Devices or Connections
No Audio Tuner Input **ONLY**
Replace TU-Board
No Audio Memory Stick Input **ONLY**
Replace MSX & MSBoard
Yes
Check Voltage at CN4601/ Pins 1&2
Replace G1-Board
No
Is Voltage 12V Present? Yes
Check Speaker Connections on A1-Board
Replace A1-Board
Yes
Connections OK? No
Repair Speaker Connections
CTV-35
Good
Check Individual Audio Inputs
No Audio Inputs 1 **ONLY**
Replace U1-Board
No Audio Input 2 **ONLY**
Replace H2-Board
No Audio Inputs 3 **ONLY**
Replace A1-Board
No Audio Input 4 **ONLY**
Replace UD-Board
IMPORTANT LCD Panel and Board part numbers are serial number dependent. Go to appendix and reference serial number range for proper part number of component .
20
Chapter 4 - KLV-32M1 Troubleshooting Flowcharts Initial Contact Flowchart A
KLV-32M1 Index Troubleshooting Flowchart A
A Start Initial Analysis
Does unit Turn ON?
No
GO TO Power-ON Troubleshooting Flowchart B
Yes
Is RED LED Flashing? Red LED ON in Standby Green LED flashes and Glows Steady
Yes
GO TO Protection Mode Troubleshooting Flowchart C1 & 2
No
Is Video Present? Yes
Is Video Distorted?
Yes
GO TO Video Distortion Troubleshooting Flowchart E
No
No
GO TO No Video Troubleshooting Flowchart D
Is Audio Present?
No
GO TO No Audio Troubleshooting Flowchart F
Yes
GO HOME No Problem Found Unit Fully Operational
CTV-35
21
4. KLV-32M1 Troubleshooting Flowcharts
Power-ON Troubleshooting Flowchart B
KLV-32M1 Power-ON Troubleshooting Flowchart B
B
Press TV POWER Button (Not RemoteControl)
Unit will Not Turn- ON (No Power)
Is RED LED ON?
No
Does GREEN LED light?
No
Yes
How many Initial Relay Clicks are heard? 0 or 1
AU-Board
Check Voltage at CN651/Pin 14
Check connections CN7000 & CN5504
Is voltage STBY 5V Present?
Yes
No
Yes
Press TV or RemoteControl POWER Button
GL-Board
Connections OK?
No
Repair connections
Yes
Replace BL-Board A-1052-703-A
Replace GL-Board A-1052-705-A 1
0 GL-Board
Check Voltage at CN651/Pin 15
Does GREEN LED remain ON?
Yes
Check voltage at CN5504/Pin A 43
No
Replace GL-Board A-1052-705-A
Yes
Is voltage 3.2V Present?
RED LED is Flashing 1.5sec. ON 0.5sec. OFF
No
Replace BL-Board A-1052-703-A
CTV-35
Is voltage Panel 5V Present?
Yes
Initial Power OK Troubleshoot Video, Panel, or Audio Problem
No
Replace AU-Board A-1071-844-A
Replace BL-Board A-1052-703-A
22
4. KLV-32M1 Troubleshooting Flowcharts
Protection Mode Troubleshooting Flowchart C1 KLV-32M1 Protection Mode Troubleshooting Flowchart C-1 C-1 Unit Shuts OFF RED LED Flashing
NOTE: All voltages are measured prior to unit shutdown
2sec. ON 2sec. OFF LCD Drive
0.5sec. ON 1.5sec. OFF LCD Panel
GL-Board
Check Voltage At CN652/ Pins 1-5
Is Voltage 16.5V Present?
BL-Board
Yes
Check Voltage At CN652/ Pin 12
GL-Board
No
Replace GL-Board A-1052-705-A
Check Voltages At CN1001/Pins B45 & A47
Are voltages B45 - 5V A47 - 3.3V Present? Yes
Is Voltage 3.3V Present?
No
Replace BL-Board A-1052-703-A
Replace BL-Board A-1052-703-A
No
Replace AU-Board A-1071-844-A NOTE: Confirm Power Supply operation on both the GL & AU boards reference Flowchart B
Yes
Replace LCD Panel 1-805-640-11 Assembly
CTV-35
23
4. KLV-32M1 Troubleshooting Flowcharts
Protection Mode Troubleshooting Flowchart C2
KLV-32M1 Protection Mode Troubleshooting Flowchart C-2
C-2
NOTE: All voltages are measured prior to unit shutdown
Unit Shuts OFF RED LED Flashing
NOTE: Check that the TV is not near other devices that may cause a rise in temperature. Such as, home heating systems.
1sec . ON 1sec. OFF Temperature
1.5sec. ON 0.5sec. OFF Power Supply
Confirm acceptable local external environment temperature
Check Voltage at CN651/ Pins 5-8
Is temperature < 75 degrees Celsius Present?
GL-Board
No
Move TV into an acceptable environment and Re-Test
Is Voltage 10.5V Present?
Normal temperature to Yes the touch
Replace BL-Board A-1052-703-A
CTV-35
Is voltage 8.5V Present? No
Replace GL-Board A-1052-705-A
Yes
Yes Excessive temperature to the touch Is Replace Temperature No LCD Panel of LCD Panel 1-805-640-11 only warm to the Assembly touch?
Check Voltage at CN1001/ pin A47
BL-Board
Check Voltage at CN1001/ Pin B40
Is voltage 8.5V Present? Yes
No
Replace AU-Board A-1071-844-A
BL-Board
No
Replace AU-Board A-1071-844-A
Yes Check Voltage at CN652/ Pins 1-5
GL-Board
Does voltage Increase to 20V before shutdown?
No
Replace BL-Board A-1052-703-A
Yes
Replace GL-Board A-1052-705-A
24
4. KLV-32M1 Troubleshooting Flowcharts
No Video Troubleshooting Flowchart D KLV-32M1 No Video Troubleshooting D Flowchart D No Video
Is Video Missing on All Inputs ? 1,2,3 etc.
Check Voltage at CN9302/ Pin 25
Yes
ULU-Board
Is Voltage 9V Present?
Check External Devices and Separate Connections Swap Devices and Connections
No
Replace ULU-Board A-1052-705-A
CTV-35
Yes
Replace AU-Board A-1071-844-A
Check Voltage at CN4501/ Pins 26-30
Is Voltage 5V Present?
Check for analog component signals on CN9303/ Pins 1,3,5
Are External Devices and Connections OK?
Are signals Present?
Check Voltage at CN9302/ Pins 17-18
Is Voltage 5V Present?
Replace BL-Board A-1052-703-A
Yes
Yes
No
Replace AU-Board A-1071-844-A
Turn ON USER MENU
No
Replace AU-Board A-1071-844-A
Yes
No
ULU-Board
Yes
No
No
TV OK Repair External Yes Devices or Connections and Re-Test
Does USER MENU Display?
No
Replace ULU-Board A-1052-705-A
Check LVDS Cable Connections between BL Board & LCD Panel Assb.
LVDS Cable Connections OK?
No
Repair LVDS Cable Connection and Re-Test
Yes
Replace LCD Panel 1-805-640-11 Assembly
25
4. KLV-32M1 Troubleshooting Flowcharts
Video Distortion Troubleshooting Flowchart E KLV-32M1 Video Distortion Troubleshooting Flowchart E
E Video Distorted
Is Distortion on All Video Inputs ? 1,2,3 etc.
Turn ON USER MENU
Yes
No
Replace BL-Board A-1052-703-A
Yes
No
TV OK Repair External Bad Devices or Connections
Is Distortion in USER MENU?
Check External Devices and Connections Swap Devices and connections
Is Distortion Stationary Missing Horizontal or Vertical Lines. Or Missing Pixels?
No
Replace BL-Board A-1052-703-A
Good Yes
Video 1,2,3, Distorted Video 4, 5 OK
Replace BL-Board A-1052-703-A
CTV-35
Video 1,2,3, OK Video 4, 5 Distorted
Replace LCD Panel 1-805-640-11 Assembly
Replace ULU-Board A-1052-705-A
26
4. KLV-32M1 Troubleshooting Flowcharts
No Audio Troubleshooting Flowchart F
KLV-32M1 No Audio Troubleshooting Flowchart F
F No Audio (Speaker Outputs)
NOTE: Confirm all DC Voltages to circuit boards before replacing No
Is Audio Missing on All Inputs ? 1,2,3 etc.
Check External Devices and Connections Swap Devices and connections
Bad
TV OK Repair External Devices or Connections
Yes Good
Check Center Speaker Input
Is Audio Present at Speakers? No
Check Speaker Connections on AU-Board
Yes
Check Voltage at CN9302/ Pin 25
Is Voltage 9V Present? No
Replace AU-Board A-1071-844-A
Yes
Connections OK? No
Repair Speaker Connections
CTV-35
Check Individual Audio Inputs
Replace AU-Board A-1071-844-A
Yes
Replace ULU-Board A-1052-705-A
No Audio Inputs 1 & 2 **ONLY**
Replace ULU-Board A-1052-705-A
No Audio Input 3 **ONLY**
Replace H3-Board A-1073-555-A
No Audio Inputs 4 **ONLY**
Replace ULU-Board A-1052-705-A
No Audio Input 5 **ONLY**
Replace P-Board A-1052-776-A
No Audio Tuner Input **ONLY**
Replace TUNER 8-598-593-60
27
Chapter 5 - KDL-32/42XBR950 Troubleshooting Flowcharts Initial Contact Flowchart A
KDL32/42XBR950 Initial Contact Flowchart A
A START
Does Unit Turn On?
No
Go To No Power Yes Troubleshooting Flowchart B
Is Video Normal?
No
Go To Video Troubleshooting Flowchart D
Yes
Does Timer LED Ever Flash Red?
Yes
No
No
Does Video Appear ?
Go To Protect Troubleshooting Flowchart C
No
Go To Video Troubleshooting Flowchart D
Audio Present ?
No
Go To Audio Troubleshooting Flowchart E
Yes
FINISHED
Yes
CTV-35
28
5. KDL-32/42XBR950 Troubleshooting Flowcharts
No Power Troubleshooting Flowchart B
KDL32/42XBR950 “No Power” Troubleshooting Flowchart B
B Unit Does Not Turn On
Standby LED Lit on Media Box ? No
Replace Media Receiver Unit
Yes
Flashing Orange ?
Turn Unit On
Yes
Standby LED on Panel Lit ?
No
Check Panel Has AC Power Replace G Board
Yes
Communication Error . Check A/V Cables
CTV-35
Go to Diagnostics Troubleshooting Flowchart B
Steady Green A/10 Seconds?
>10sec
HDCP Key Error Media Receiver or DES Board on Panel
Yes
No
Flashing Red?
Led Flashing ? GREEN
Yes
Flashing Orange ?
RED
Yes
Go to Diagnostics Troubleshooting Flowchart B
Power Circuits OK
29
5. KDL-32/42XBR950 Troubleshooting Flowcharts
Protection Mode Troubleshooting Flowchart C
C
KDL32/42XBR950 “Protect Mode” Troubleshooting Flowchart C
Protect Mode
Standby LED Flashing Red?
Unit Not In Protect Moded No
Yes See Diagnostics Table
KDL32/42XBR950 SELF-DIAGNOSTICS DISPLAY
CTV-35
MEDIA RECEIVER STEADY RED STEADY GREEN
DISPLAY UNIT STEADY RED STEADY GREEN
POSSIBLE CAUSE NORMAL - UNIT IN STANDBY NORMAL - UNIT POWERED ON
NONE NONE
REMEDY
RED FLASHING 9X RED FLASHING 9X RED FLASHING 9X RED FLASHING 9X RED FLASHING 10X RED FLASHING 8X RED FLASHING 6X RED FLASHING 4X ORANGE FLASHING ORANGE FLASHING NO LIGHT
RED/GREEN FLASHING RED FLASHING 7X RED FLASHING 6X RED FLASHING 4X STEADY RED STEADY RED STEADY RED STEADY RED ORANGE FLASHING NO LIGHT ORANGE FLASHING
LCD BACKLIGHT OR INVERTER FAILURE DC DETECT ON SPEAKER LINES LOW B+ DETECT EXCESSIVE PANEL TEMPERATURE OVER-VOLTAGE DETECT OVER-VOLTGE DETECT LOW-VOLTAGE DETECT FAN ROTATION ERROR MEDIA CABLES UNPLUGGED NO POWER TO DISPLAY NO POWER TO MEDIA RECEIVER
REPLACE LCD PANEL K BOARD (32") K1 BOARD (42") REPLACE G BOARD REPLACE G BOARD REPLACE MEDIA RECEIVER REPLACE MEDIA RECEIVER REPLACE MEDIA RECEIVER REPLACE MEDIA RECEIVER CHECK MEDIA CABLES GO TO NO POWER FLOWCHART REPLACE MEDIA RECEIVER
30
5. KDL-32/42XBR950 Troubleshooting Flowcharts
Video Troubleshooting Flowchart D
KDL32/42XBR950 Video Troubleshooting Flowchart D
D
NOTE: The backlight should be on . The unit normally shuts down and goes into panel alarm protect .
Video Problem
Video Present ?
No
Yes
Panel Backlight ON?
No
Replace Panel PN T99861283 (32") T99861284 (42")
Distortion In Video?
Yes
Can OSD Be Displayed?
No
DES Board PN A1302861 A or Media Receiver
Yes
Media Receiver Unit PN T99861282
Yes
No
DONE
CTV-35
31
5. KDL-32/42XBR950 Troubleshooting Flowcharts
Audio Troubleshooting Flowchart E
KDL32/42XBR950 Audio Troubleshooting Flowchart E
E
Audio Problem
Audio Heard ?
No
Standby LED Blinking 7X?
Yes
Yes
K Board (32") PN A1405907 C K1 Board (42") PN A1410280 A
No
Audio Problem All Inputs?
Yes
DES Board PN a1302861 A K Board (32") PN A1405907 C K1 Board (42") PN A1410280 A
No
Media Receiver Unit PN T99861282
Yes
Distorted?
No
DONE
CTV-35
32
Appendix KLV-26HG2 LCD Panel & Board Part# per Unit Serial Number
CTV-35
1
Appendix
KLV-26HG2 LCD Panel & Board Part# per Unit Serial Number Cont.
CTV-35
2
Appendix
KLV-26HG2 Board Location LCD Logic Board (under G1-Board; Under sheild)
G1-Board
Backlight Inverter Board (under Sheild) H1-Board
A1-Board U1-Board
TU-Board
MSB-Board MSX-Board
H3-Board
MS-Board
B-Board
UD-Board
H2-Board
Backlight Return Lines KLV-26HG2 Board Location CTV-35
3
Appendix
KLV-32M1 Board Location LCD Logic Board (under shield )
BL-Board
Backlight Inverter Board (under shield )
Backlight Return Lines (under shield )
GL-Board AU-Board
ULU-Board H1-Board
H3-Board H2-Board (behind ULU -Board)
P-Board (under shield )
KLV-32M1 Board Location CTV-35
4
Appendix
KDL-32/42XBR950 Panel Board Location
KDL-32/42XBR950 Board Location
CTV-35
5
Appendix
KLV-26HG2 Protection Mode Indications and Failure Areas
KLV-32M1 Protection Mode Indications and Failure Areas
CTV-35
6
Appendix
KDL-32/42XBR950 Protection Mode Indications and Failure Areas
CTV-35
7
Appendix
KLV-26HG2 Block Diagrams Power Supply
G1 Board
A1 Board
CN6004
1 \ 16.5V 5
To Inverter Board
13
AC Input
F601
CN6003 16.5V 13
D6000 IC6002 Primary Power Supply
6.8V 17V 33V
17V STBY 5V
Q6007
3.3V Reg
PS4601
Power 3 3.2V 24 from B-Board 3.2V 25 Power 4 from B-Board CN2801
CN4603 IC4601 Secondary Power Supply
PS4602
5 \ 7 1 \ 2
5 \ 7
3.3V to B-Board Memory Stick
1
D3.3V to B-Board
11
12V Panel Volage to Logic Board
CN2801 23
Q4606
3.2V
Power 2 from B-Board
9
9V to B-Board
8
D5V to B-Board
5V Reg
1 \ 2
11
Q4605
9V Reg
CN4601
9V Reg
Audio Circuits
CN4603
Audio
PH6001
PS7001 Amplifier 11
Q6007 IC6001 Standby 5V Power Supply
MSB Board
CN4601
3 1
CN6006
3.2V
Power 1 (ON) from B-Board
PS6450
STBY 5V to B-Board Main Micro
30V Reg
Tuner Board
KLV-26HG2 Power Supply Overall Block
CTV-35
8
Appendix
Protection Circuits G1-Board
LCD Panel Assemble
IC6002 Primary Power Supply UNREG 6V
Backlight Inverter Board
16.5V
CN6003 5 - 7
13
CN4601 5 - 7
13
CN4604 4
D4607
B-Board
3
4V
3.1V
Q4604
13V
CN4603 25
CN1003 1 Panel Detect
3.3V
24
2
16.5V
21
5
Backlight DC IN_ALERT
IC4603 5V Reg
IC1006 Main Micro
R4644 Drive 16 Output
IC4601 Scondary Power Supply
Q4603 12V Reg
Q4605 Panel 12V Switch
D4611
IC4602 9V Reg
D4612
R4642
3V
19
7
5V ALERT
R4643
A1-Board KLV-26HG2 Protection Circuits
CTV-35
6
R4645
2.75V
Power 12 Good
20
3.3V ALERT
I2C
IC1002 Temp
UART
IC7503 Scan Converter
9
Appendix
Video Processing 9V
A1-Board
B-Board
VID
Video 1
U1-Board
Video 2
H2-Board
RF
IC2803 Switcher
V-Chip
9V
Y/CV C
R
TU-Board
IC2511
IC2505 Switcher
Component
V-Chip OSD
B
CCP2
CB CR
5V
Memory Stick Interface
Scan Converter UART
I2C (MS) Digital Component Signal
MS Board Memory Stick Processing
3.3V 2.5V User & Service Mode OSD Generator X5801 33MHz
IC5802
IC1006 Main Micro
X5001 14.32MHz
IC7503
I2C CCP_SW
MSX Board
DRC
MS
MS
J3307 B-Y J3308 R-Y J3309 Y
IC3302
3.3V 2.5V
IC3007
CR
NOTE: DRC 1.8V & 3.3V
1080i, 720p, 480p
480i
C/CB
Y
UD-Board
G
Y/CV
Switcher
DVI
3.3V
IC3600
VID
LCD Drive
X5802 100MHz
3.3V
IC5804
LVDS TX
2.5V 3.3V
Memory Stick OSD Generator
LCD Panel Assemble KLV-26HG2 Video Processing
CTV-35
10
Appendix
Audio Processing H2Board Headphone Output
HP-Mute From B-Board
A1-Board Q7001 Q7002
5V
Video 1
U1-Board
Video 2
H2-Board
RF
DVI
L/R L/R L/R
TU-Board UD-Board
R
9V
IC2803
R R R
IC2801
MS Board
L L
Switcher
R
L
IC7002 Audio Control
IC2802 Switcher
Memory Stick Interface
CTV-35
9V
IC7011
Audio Processor
Q7018 Q7019
9V 12V
12V R L
R L PS7001
J7004 Audio Var/Fix Output
IC7007 Audio Amplifier
Q7007
P-Mute From Secondary Power Supply IC4601
9V L
Memory Stick Processing
MSX Board
L
IC7400 Comparato r
Switcher
L
Component
Q7005 9V Q7006
R
IC7002 HP Amp
SP-Mute From B-Board
KLV-26HG2 Audio Processing
11
Appendix
KLV-32M1 Block Diagrams Power Supply
GL-Board
CN652
RY601
16.5V D6000
AC Input
IC621 10.5V Primary Power Supply 30V
F601 TH601 17V
33V
AU-Board
To Inverter Board
1 \ 5
3.2V
Power 4 from B-Board
3.2V A38
5 \ 8
B38
9V Reg
12
PS7000 1 PS8500 \ 2
IC661 Standby 5V Power Supply
15
3.2V
12
A47
Q7003
A43
Q7002
B39 3.2V B45
1 \ 2
PH662 Q681
IC7002 Secondary Power Supply
5 \ 8
Q661 STBY 5V
CN5504
CN5504
Power 3 from B-Board
PS7001
9V Reg
AU9V (Audio)
B44 17
5V Reg
CN5500
CN651
STBY 5V
30V Reg
Reg 9V to BL -Board Reg 5V to ULU -Board
Tuner
15
A39
14
A50
CN7000
Power 2 from B-Board D5V to BL -Board
Audio Amplifier
CN5504
14
D3.3V to BL -Board 5V Panel Voltage
Power 1 (ON) from BL-Board STBY 5V to BL-Board Main Micro
KLV-32M1 Power Supply Overall Block
CTV-35
12
Appendix
Protection Circuits GL-Board IC621 Primary Power Supply UNREG 10.5V
CN651
CN652
Backlight Inverter Board
11
D702 6.2V CN653 1
5-8
LCD Panel Assemble
12
BL-Board
2
3.2V 4.8V
IC7001 9V Reg IC7000 9V Reg
PS7000
19
IC7002 17 Scondary Power Supply 29 27
Q7001 D5VV SW
Q7000 D3.3V SW
9V R5583 D5504
AU9V
IC7003 5V Reg
IC7005 5V Reg
D5505 R5581 D7003 5.6V
8.5V
R5582
Panel Detect
CN1001 DC-IN ALERT B40
R5580
3V
A41
IC1002 Main Micro
5V ALERT
R5505
Q7003 Panel 5V SW
D7002 3.9V
AU-Board
CTV-35
1
D1002 5.6V
4.9V
3.3V
KLV-32M1 Protection Circuits
CN1004 Backlight 2
A43
A47
Panel 5V
3.3V ALERT I2C
IC1002 Temp
UART
IC7503 Scan Converter
13
Appendix
Video Processing 9V
Video 1 Video 2 Video 3
H3-Board
ULU-Board
BL-Board VID
VID
IC9602 Switcher
Y/CV
9V
C
RF
V-Chip
R
G
IC9801
CR
B
1080i, 720p, 480p
CCP2
Scan Converter
IC9800 Switcher
Component Input
UART
Y
P-Board
CCP_SW
CB
X4001 14.32MHz
IC4007
I2C
HDMI
DRC
3.3V 2.5V
IC2006
J3007 B-Y J3008 R-Y J3009 Y
IC3002
480i
Switcher
Tuner
NOTE: DRC 1.8V & 3.3V
V-Chip OSD
Y/CV C/CB
AU-Board
3.3V
IC2003
Main Micro
5V
X4501 33MHz
LCD Drive
X4502 100MHz
3.3V
IC4504
I2C
User & Service Mode OSD Generator
IC4502
IC1002
CR
3.3V 2.5V
LVDS TX
2.5V 3.3V
LCD Panel Assemble KLV-32M1 Video Processing
CTV-35
14
Appendix
Audio Processing EQ SW From BL-Board
HP-Mute From BL-Board
ULU-Board
AU-Board 9V
Headphone Out Video 3
HDMI
H3-Board
L/R
Q8601 Q8602
L/R 9V
IC9602 Switcher
R R
IC9600
Component
Audio Var/Fix Output Center Speaker Input
Switcher
R L
9V
9V
9V 9V
9V
IC8001
IC800 2 Amp
Audio Selector R L
L
IC9601
L
9V
IC830 0 EQ
IC8100
IC830 1 Amp
Audio Processor
IC8302 Switch IC8303 Switch
R
Switcher
L
R
IC8601 HP Amp Mute
L/R
TU-Board P-Board
Q8603 Q8604
L/R
Video 1 Video 2 RF
Mute
Q8002
Center Speaker SW1
Q8001
Center Speaker SW2
9V
Q8300
IC850 0 Amp
9V
9V L
J9302 TB9300
Mute
IC8602 Amp
IC8600 Switch
9V
9V
IC8501
Audio Q8700 Amplifier PS8500 30V SP-Mute From BLBoard
KLV-32M1 Audio Processing
CTV-35
15
Appendix
KDV-32/42XBR950 Block Diagrams Overall System Block Diagram
MEMORY STICK INPUT
G BOARD
QH BOARD
G1 BOARD (32") G2 BOARD (42")
QT BOARD COMPOSITE VIDEO 1~3 COMPONENT VIDEO 5 & 6
QM BOARD A BOARD
K BOARD (32") K1 BOARD (42") DIC2 BOARD AUDIO DATA (BLACK CONNECTOR)
DVI INPUT FRONT AND REAR iLINK
UD BOARD
DES BOARD M BOARD
MDB-XBR950L MEDIA RECEIVER BOX
VIDEO DATA (WHITE CONNECTOR)
TO LCD PANEL LDM32/4210 LCD DISPLAY
FIGURE 1-1 - KDL32/42XBR950 OVERALL BLOCK DIAGRAM CTV34.1-1
CTV-35
2/10/05
16
Appendix
LCD Panel Power Supply 1
16.5V T6200 D6300 RY6001
RY6000
D6000
AC IN
STBY 6V
SW 24V
PFC CIRCUIT
T6201 D6302 D6303
PFC LVP PROT
RELAY LATCH Q6402 , Q6403
3 4 5
D6301
CONVERTER IC6200 , Q6200 , Q6201
2
CN6300
24V
1 2 3
CN6301
24V OVP T6202 D6304
24V LVP
D6305 KDL42XBR950 ONLY 1
PWR_ON H CONV IC6500 D6500
STBY 6.5V
T6500
2 3 4 4
D6504 TH6000
9
CN6302 G1 BOARD (32") G2 BOARD (42")
FIGURE 1-3 - DISPLAY POWER SUPPLY
CTV-35
CTV34.1-3
7/11/05
17
Appendix
Audio Processing CN5005 CENTER SPEAKER IN RELAY
K2 BOARD
RELAY
(42" ONLY)
AUDIO DATA FROM MEDIA RECEIVER
IC3102 IC3103 LVDS RX SPDIF TX
IC5001 SPDIF TO PCM CONVERTER
DES BOARD IC5002 PCM TO PWM PROOCESS
K BOARD (32") K1 BOARD 42")
IC5003 AUDIO AMPLIFIER
Q5004 ~ 5007 DC DETECT
FIGURE 1-5 - AUDIO PROCESSING
CTV-35
CTV34.1-5
7/11/05
18
and i.Link are trademarks of Sony Electronics
CTV-35
2005 Sony Electronics, Inc. EMCSA - A Service Company 1 Sony Drive Park Ridge, New Jersey 07656 Reproduction in whole or part without written permission is prohibited. All rights reserved
6/29/05
KLV-32M1 KLV-26HG2
LCD Direct-View Televisions Theory of Operation and Troubleshooting Course: CTV-35
KDL-32/42XBR950
Table of Contents Introduction .......................................................................... 1
Chapter 3 - KLV-26HG2 Troubleshooting Flowcharts..... 14
Course Overview ............................................................. 1
Initial Contact Flowchart A ............................................. 14 Power-ON Troubleshooting Flowchart B ....................... 15 Protection Mode Troubleshooting Flowchart C1............ 16 Protection Mode Troubleshooting Flowchart C2............ 17 No Video Troubleshooting Flowchart D ......................... 18 Video Distortion Troubleshooting Flowchart E ............... 19 No Audio Troubleshooting Flowchart F.......................... 20
Chapter 1 - Basic LCD Display Theory ............................. 2 Basic Operation of an LCD Projection Television ............ 2 Overview.......................................................................... 2 Liquid Crystal Technology ................................................ 2 Light Polarization ................................................................. 2 Liquid Crystals ..................................................................... 3 Creating Color With Liquid Crystals ..................................... 4 Direct-View LCD .................................................................. 5
Chapter 2 - LCD Display Troubleshooting ........................ 6 Introduction ...................................................................... 6 Video Abnormalities Troubleshooting .............................. 7 No video .......................................................................... 7 Backlighting ......................................................................... 7 No Video with Backlighting .................................................. 7
Distorted Video ................................................................ 8 Rows or Columns of Pixels Lit or Unlit................................. 8 Digital Distortion Entire Screen .......................................... 10 Improper Video Level..........................................................11
White Balance ................................................................11 Adjusting White Balance .....................................................11 Adjusting White Balance Without a Color Analyzer ........... 12
CTV-33
Chapter 4 - KLV-32M1 Troubleshooting Flowcharts ....... 21 Initial Contact Flowchart A ............................................. 21 Power-ON Troubleshooting Flowchart B ....................... 22 Protection Mode Troubleshooting Flowchart C1............ 23 Protection Mode Troubleshooting Flowchart C2............ 24 No Video Troubleshooting Flowchart D ......................... 25 Video Distortion Troubleshooting Flowchart E ............... 26 No Audio Troubleshooting Flowchart F.......................... 27 Chapter 5 - KDL-32/42XBR950 Troubleshooting Flowcharts .............................................................................. 28 Initial Contact Flowchart A ............................................. 28 No Power Troubleshooting Flowchart B ........................ 29 Protection Mode Troubleshooting Flowchart C.............. 30 Video Troubleshooting Flowchart D ............................... 31 Audio Troubleshooting Flowchart E ............................... 32
i
Table of Contents
Appendix............................................................................... 1
Overall System Block Diagram .......................................... 16
KLV-26HG2 LCD Panel & Board Part# per Unit Serial Number ........................................................................ 1 KLV-26HG2 LCD Panel & Board Part# per Unit Serial Number Cont. .............................................................. 2 KLV-26HG2 Board Location ............................................ 3 KLV-32M1 Board Location ............................................... 4 KDL-32/42XBR950 Panel Board Location....................... 5 KLV-26HG2 Protection Mode Indications and Failure Areas ............................................................................... 6 KLV-32M1 Protection Mode Indications and Failure Areas 6 KDL-32/42XBR950 Protection Mode Indications and Failure Areas ..................................................................... 7 KLV-26HG2 Block Diagrams ........................................... 8
LCD Panel Power Supply .................................................. 17 Audio Processing .............................................................. 18
Power Supply....................................................................... 8 Protection Circuits................................................................ 9 Video Processing ............................................................... 10 Audio Processing ................................................................11
KLV-32M1 Block Diagrams ............................................ 12 Power Supply..................................................................... 12 Protection Circuits.............................................................. 13 Video Processing ............................................................... 14 Audio Processing ............................................................... 15
KDV-32/42XBR950 Block Diagrams.............................. 16
CTV-33
ii
Introduction Course Overview The main concept behind this course is to develop a working (or basic) understanding of the Liquid Crystal Display (LCD) technology, and combine this knowledge with the simplified flowchart type troubleshooting procedures to effectively and efficiently service and repair Sony LCD direct view television products. With this concept in mind the sequence of this training manual is laid out as follows. The training manual starts with Chapter 1 providing the basic explanations and illustrations of the LCD technology. The theoretical knowledge gained from this information will prove to be extremely helpful in understanding why and how possible defects can occur. Chapter 2 is a natural extension of chapter 1, in that it provides descriptions and illustrations of real life defects that can occur in LCD base products. These are general (not model specific) defects that can occur in any LCD base product. Chapters 3, 4, and 5 provide model specific flowchart type troubleshooting procedures. These flowcharts are base on board level troubleshooting. However, in some cases they will direct the troubleshooter to a possible defective component. Keep in mind while reading this training manual that if a particular defect scenario is not covered, there is detailed training manuals developed for each model cover in this manual. Go to the Sony ESI web site and search the training web page for the model specific training manual for detailed component and board level troubleshooting procedures. Models Cover in this manual: KLV-26HG2
KDL-32XBR950
KLV-32M1
KDL-42XBR950
CTV-35
1
Chapter 1 - Basic LCD Display Theory Basic Operation of Liquid Crystal Display (LCD)
Liquid Crystal Technology Three items are required for and LCD display to function: A backlight source, polarizing of the light source, and liquid crystals to manipulate the polarizations of this light.
Overview Projection television displays utilizing LCD technology have been around on mass production scale for about 16 years. During most of this time period the devices were front-type projection units. The display unit was mounted on a table or hung from a ceiling to be projected to a wall or screen. This sufficed for most commercial applications and in some home use. Recent years have seen an explosion in the number of rear-type LCD projection televisions. Their all-in-one design eliminates the need for unsightly equipment and wires normally found in front projection setups. Advances in screen design have allowed the new rear-projection televisions to generate bright, crisp video with improved viewing angles that rivals front projection devices. Geometric distortion and convergence issues are virtually non-existent.
Light Polarization In Figure 1-1, an example of how light is affected by polarizing filters is shown. Normal light can be transmitted anywhere along a 360-degree plane. This is especially true for scattered light being reflected off of random surfaces. This is why polarizing sunglasses are so effective. In this example, a polarizing filter that only allows light on a vertical plane is used to filter the incoming backlight. If another filter is placed in front, allowing only horizontal phased light to pass, the light is effectively blocked. LCD devices use this basic principle to control the amount of light passing through.
This chapter will cover the basics of the LCD display technology used in today’s products. All of the items discussed can be applied to Front Projection, Rear Projection, and Direct-View LCD display units. The video process circuits and light box assemblies function the same way. The only difference between the two is how the generated image is projected. Since most homes will have the rear projection unit, the descriptions to follow will focus on them.
FIGURE 1-1 PLOARIZING FILTERS CTV-35
2
1. Basic LCD Television
Liquid Crystals Although liquid crystals come in many different forms, the key difference between the types is the arrangement of the crystals. Some have randomly arranged crystals while others are arranged in a specific pattern. Other differences include how they react to temperature, pressure, magnetic fields, and electrical current. The crystals used in LCD display devices are know as “chiral nematic”. As the crystals are arranged in layers, the crystals naturally twist slightly with each subsequent layer. Layers can be added until the crystals complete a 90-degree “twist”. This twist in the crystalline structure can be used to take a certain polarized light and shift its phase accordingly. The other characteristic of a nematic-type crystal is it ability to react to an electric potential. If an electrical potential is applied to the crystal layers, the twisted crystals will begin to “un-twist” in an amount proportionate to electrical potential until, when enough potential is reached, they line up perfectly. This is how liquid crystals are used to control light and generate images on a display device.
FIGURE 1-2 LIQUID CRYSTAL EFFECT ON POLARIZED LIGHT
Figure 1-2 illustrates how the naturally occurring twist in the crystalline layer rotates the incoming polarized light to match the polarized plane of the second filter. In this normal state, the crystals rotate the polarized light 90-degrees to match the plane of the outgoing polarizing filter allowing the backlight to pass through. In Figure 1-3, an electrical potential is applied to fully “un-twist” the crystals. The polarized backlight is now perpendicular to the outgoing filter and no light will pass. By varying this electrical potential, the amount of effect on the twisted crystals can be altered to a point where linear control of light output is achieved.
FIGURE 1-3 VOLTAGE EFFECT ON LIQUID CRYSTALS
CTV-35
3
1. Basic LCD Television
Creating Color With Liquid Crystals All that is required for LCD pixels to create color is to place a color filter in front of each pixel. By using red, green, and blue color filters, the required primary colors are generated to produce the millions of color variations needed for graphics and video display. Modern LCD technology uses what is known as Thin-Film Transistor (TFT) technology. Each pixel has its own transistor and capacitor, which increase the contrast rating of the LCD due to the increased retention of charge. This helps to dramatically increase the response time for each pixel as they are scanned. Control of each pixel is simply a matter of addressing a particular column and individually activating each pixel in that row with a properly timed address pulse on the horizontal plane. The higher the pulse level, the more the crystals align, producing a lower light output. Figure 1-4 illustrates how color filters and TFT devices are used.
FIGURE 1-4 TFT/LCD TECHNOLOGY CTV-35
4
1. Basic LCD Television
Direct-View LCD This type of display device uses the methods described previously to generate video by placing vertical columns of red, green, and blue filters over a liquid crystal layer. Thin-Film Transistors control the amount of light passing through each pixel. The light source is generated behind the LCD array. Fluorescent lamps are the most common to use. A diffuser plate distributes the light from the lamps to provide uniform brightness to all areas of the screen. A polarizing sheet is installed next to allow only one plane of light to pass. This light enters the LCD structure and is twisted 90degrees. Another polarizing sheet is placed in front of the pixels at exactly 90 degrees. With no voltage present to “twist” the crystals into alignment, full passage of the backlighting is allowed. Control of the light output from each pixel is now possible by scanning the matrix of pixels using carefully timed pulses at the horizontal and vertical planes of the columns and rows. Figure 1-5 illustrates a typical LCD panel.
FIGURE 1-4 TYPICAL DIRECT-VIEW LCD PANEL CTV-35
5
Chapter 2 - LCD Display Troubleshooting Introduction This chapter will cover issues that are unique to LCD display designs. The troubleshooting procedures will be structured so as to provide the best generic approach to isolating the cause of the failure. Most repairs are performed by replacing circuit boards. This is especially true for units that are in warranty since the service policies forbid component level servicing in almost all cases. The video and audio processing circuits are virtually identical to those used in other display devices (e.g. CRT and Plasma). Particular attention will be given to the circuits that control and drive the panel. The Key components common to all LCD displays include the LCD panel assembly (there will be 3 of them in a projection unit), a method of passing back lighting through the LCD crystals, and circuits to scale the incoming video data to the resolution of the panel. Regardless of the signal source, the video signal is in a digital format. All analog signal sources are digitized by the initial video process circuits. LCD panels can only accept digital signals. Most designs accept the individual RGB components in an 8 or 10-bit word size. The RGB signal will have been scaled to meet the fixed resolution of the panel. This digital RGB data is allocated to the correct pixel position on the panel by the panel logic circuit.
lighting on the panel. Tips will be provided later in this chapter to point out some of the unique symptoms of panel-caused distortions versus those that are usually seen when the video process circuits are at fault. Other failures can occur such as a unit that will not turn on or turns its self off for protection purposes. The latter will usually generate a diagnostic indication that may help in determining what the cause is. Failure of the audio processing and amplifying circuits must also be considered. All of the previously mentioned items are diagnosed in different ways that are unique to the chassis/model design. This chapter is geared towards generic approaches to servicing LCD televisions. Additional chapters in this manual will contain troubleshooting flowcharts specifically tailored for a model or group of models. Diagnostics procedures that are unique to specific models are best followed with troubleshooting flowcharts specific to them. This manual will contain such charts located in individual chapters labeled with the model or chassis they are designed for.
Failures occurring with the LCD panel itself or the above mentioned circuits usually manifest themselves in an easily recognizable symptom. The most common are: •
No picture
•
Missing or fully lit horizontal lines (individually or in groups)
•
Missing or fully lit vertical lines (individually or in groups)
•
Distortion in the displayed video
This last bullet can be more difficult to discern since the distortion can be caused by the video process circuits rather than those used to control pixel
CTV-35
6
2. LCD Television Troubleshooting
Video Abnormalities Troubleshooting
Backlighting
Video abnormalities can be anything from no video at all, missing lines or sections, unwanted pixel lighting, and severe to subtle distortions. The different scenarios that might be encountered will be classified and practical approaches applied.
All LCD televisions, whether a direct-view or projection type, require a light source be present to pass through the LCD crystals and out to the viewer. In direct-view units the current choice is multiple fluorescent tube lamps whose light output is spread by a diffuser panel. Projection units utilize a high-intensity lamp. In Sony LCD projection units, the lamp light is split into red, green, and blue light components. These light components are sent to individual LCD panels for pixel control and recombined for projection to a screen.
No video
A true “no video” condition assumes that none of the various inputs or tuner sources are displaying a picture. As mentioned earlier, it is important to immediately isolate the cause and determine if it lies within the video process or the panel control circuits. All Sony televisions generate what is known as “On Screen Display” graphics (OSD). Any display of on-screen graphics (such as channel, video input numbers, or customer setup menus) immediately disqualifies the panel and the drive circuits as the cause. On-screen graphics can be a powerful troubleshooting tool but its use is unique to the design of the unit. A flowchart specific to that chassis/ model should be used.
Since current LCD technology is unable to completely block backlighting, a small amount of light passes through the LCD crystals and can be seen as a dark gray raster. Ambient room lighting will determine how easy this is to see. In most cases it is easier to watch the screen as the unit is being turned off to see if the raster becomes slightly darker. All Sony LCD televisions contain protection circuits to monitor the circuits driving the backlight lamps. If the ballast control circuits or the lamp(s) fail, the unit will usually shut down and display a diagnostics indication. How this is done is unique to each model. Utilizing a troubleshooting flowchart for that specific model is the best way to isolate the cause. Verification of backlighting should always be the first step in isolating a “no video” condition regardless of the presence of protection circuits.
No Video with Backlighting If backlighting is confirmed, the next step is to observe for the presence of any on-screen display (OSD) graphics. These are generated by the main microprocessor or video process circuits. The presence of OSD is a clear indicator that the LCD panel and its associated drive circuits are functioning. The focus of attention is now in the video input and process circuits. Use a troubleshooting flowchart for the specific model to assist in isolating the problem.
CTV-35
7
2. LCD Television Troubleshooting
Distorted Video
Rows or Columns of Pixels Lit or Unlit
Distortions in the video can be a difficult challenge since it can manifest itself in many ways. Fortunately, many of the distortion issues that are caused by the panel control and driver circuits are unique and usually easy to identify. Distortions can be classified into the following groups:
Fully lit rows or columns of pixels are more common in LCD panels than ones that are not lit at all. The horizontal and vertical address lines are controlled by drive circuits that are linked to the panel via flexible PC cables. These cables are bonded to the outer edge of the panel. If the bond is lost at one or more of the lines, the control voltage will be lost. This allows the liquid crystals to twist to their normal position and allow full light to pass through. Since an entire line is affected all of the red, green, or blue pixels will light. This is a clear indication of a panel failure since very expensive and specialized equipment is needed to repair the bond. Any unit under warranty will need to have the panel replaced. Figure 2-1 illustrates and example of this failure.
•
Unlit or fully lit rows or columns of pixels
•
Digital distortion across the screen
•
Improper video level
•
Dark or colored spots on the screen
Current Sony policy dictates the entire unit be exchanged for direct-view models. On larger LCD panels, policy changes may occur, allowing the replacement of the defective panel in the field. Always review the current service policy for a particular model by visiting the ESI website.
CTV-35
8
2. LCD Television Troubleshooting
FIGURE 2-1 SAMPLE OF LCD PANEL FAILURES CTV-35
9
2. LCD Television Troubleshooting
Digital Distortion Entire Screen Unless the LCD panel has been damaged in any way, this type of distortion is usually caused by the process circuits for the video signal. The proper step is to isolate the cause to a particular board. The two key circuits for processing video are the initial circuits to perform analog to digital conversion, and another to scale the incoming video data to the panel resolution and allocate that information to the proper pixels. Distortions caused by digital process circuits are unique and, in most cases, easy to identify as to the source. Random points of pixel lighting and loss of detail in the displayed image are examples of distortion caused by the initial video process stages. If this happens, using the OSD functions of the unit can help to verify this. OSD is usually inserted near the end of the digital processing, before it enters the panel scaling circuits. Figure 22 illustrates an example of a digital process failure in the front end of the process circuits. Note how the OSD is unaffected. The OSD has made it clear that there is nothing wrong with the panel or the scaling and drive circuits. Distortions caused by the scaling and panel drive circuits usually generate symmetrical patterns. Erroneous highlight and black level can also occur here since gamma correction is performed at this stage.
FIGURE 2-2 DIC2 CIRCUIT FAILURE
CTV-35
10
2. LCD Television Troubleshooting
Improper Video Level
White Balance
Video level issues can affect one or all of the primary colors. The panel scaling and control circuits are reliant on the initial video process stages to properly reproduce brightness and contrast levels. If an overall picture level problem occurs with white balance appearing normal, suspect the failure in the initial video stages. It is not likely that a failure in the gamma correction or LCD drive circuits will affect all three colors.
White balance adjustments are provided to vary the output level of the red, green, and blue LCD panels to achieve proper gray-scale of the displayed image. In a direct-view LCD television, the level of each red, green, and blue pixels are varied. Most Sony televisions have more than one white balance setting. Three are most common. They are: Cool, Neutral, and Warm.
In situations where one color is at a level so as to affect white balance, the problem can be in the initial video stages or in the panel. White balance shifts on direct-LCD units are not common. If the entire range of a particular color has increased or decreased suspect a problem in the initial video stages since this is where these adjustments are located and stored on to non-volatile memory. Gamma shifts or failures usually cause white balance problems at the extreme low or highlight areas of a particular color.
Neutral is a “true” white balance. If a test pattern were to be displayed using a “stair-step” pattern from full white to black, all of the brightness levels of the scale would be true black, white and gray. The “Cool” setting adds a small amount of blue to give the picture a “hot” look. “Warm” contains a small amount of red to soften the intensity of the picture.
White balance issues with a projection LCD unit are approached in an entirely different manner. Since 3 separate LCD panels are used, it is possible for white balance issues to occur that is not electrical in nature. If drive to one LCD panel were to fail, the symptom would be an extreme white balance shift towards the particular color of the panel that lost drive. Likewise, damage, dust or aging of polarizing filters could cause a drop in one or more of the primary colors.
Adjusting of white balance is only required if the unit has had a board replacement in which the circuits controlling the balance are located. Other situations where white balance will require adjustment include aging of the unit through time, or when someone else has changed the settings.
Adjusting White Balance The proper procedure for adjusting white balance is covered in the service manual for each model. A color analyzer is required to properly set the X and Y values of each of the color temperature settings. The steps required to perform this adjustment varies from model to model. It also varies between a direct-view and projection unit. Because of this, it would be impossible to cover the requirements in a general sense. Each type of unit has a unique procedure for the initial setting of brightness, contrast, and what color temperature to start with. Some direct-view LCD models have an adjustable backlight that must be set to a certain level. The procedure for reading color balance from the screen also varies for a projection or direct-view model. Many technicians will not have the luxury of carrying a color analyzer. They are expensive ($4000 and up) and require training to use properly. In cases where color balance must be adjusted and an analyzer is simply
CTV-35
11
2. LCD Television Troubleshooting not available, there is a procedure that can be performed that will produce satisfactory results. Although not nearly as accurate, it is better that not doing the adjustment at all. This procedure should only be done if it is absolutely necessary and a color analyzer cannot be acquired.
Adjusting White Balance Without a Color Analyzer In cases where a color analyzer is not available, white balance can be aligned by eye. Technicians who are experienced with adjusting CRTbased displays will be familiar with this procedure. They are similar except that CRT’s require that the G2 grid (screen) be adjusted to the point of stopping the electron emissions from the cathode at reference black. Drive controls are then adjusted to make each cathode emit the proper level of electrons at high brightness to achieve a white raster. When adjusting an LCD display, there are no cutoff adjustments. In this particular model, the Sub-Contrast adjustments are used to adjust white balance for the bright areas of the screen. The Sub-Brightness adjustments are set for the low-level brightness areas. The best test pattern to use when visually adjusting white balance is a monochrome stair-step pattern versus a 100IRE white screen. This provides a view throughout the range of brightness levels the display will generate. Another significant difference in the adjustment procedure is starting with the “Neutral” picture setting. The “Warm” setting shifts the white balance towards the red end of the scale whereas the “Cool” setting shifts towards the blue spectrum. By using “Neutral”, the white balance can be adjusted visually. This provides a reference for the eye so that the “Cool” mode can be set with the Blue Sub-Brightness and Contrast increased slightly to boost the color temperature to around 9300K. The “Warm” setting will have more Red Sub-Brightness and Contrast levels to create a white balance in the 6500K range. “Neutral” should fall into the 8000K level. Be certain to leave the low-bit data settings for the Green Sub-Brightness
CTV-35
and Contrast to zero. The high-bit data should be in the mid range. Adjust the Blue and Red data to achieve white by adding these colors to the green. The following procedure can be used for a unit when the white balance is significantly off: 1. With the unit in “Neutral”, set the brightness level to one-third and the picture level to two-thirds. Input a monochrome stair-step pattern with at least 75IRE at the highest white level. 2. Check that the Green Sub-Contrast and Brightness levels are set to mid-range for the upper-bit data and zero for the lower-bit data. 3. Set the Red upper-bit data for Sub-Contrast and Brightness to mid-range and the lower-bit data to mid-range. 4. Set the Blue upper-bit and lower-bit data for Sub-Contrast and Brightness to zero. The picture will now be a yellowish/green. 5. Adjust the Red Sub-Contrast Low to generate a yellow color at the brightest portion of the test pattern. If you find that you are reaching the extreme end of the data range (0 – 255), set the Red Sub-Contrast High up or down one number and try again. 6. Once the bright video level is closest to yellow as possible, repeat the above procedure for the Red Sub-brightness adjustments. 7. When satisfactory yellow is achieved throughout the video range, set the high-bit data for Blue Sub-Contrast and Brightness to midrange. Adjust the low-bit data for each to change the yellow screen to white. If you are at either of the extreme ends of the data ranges (0 – 255), set the upper-bit data up or down accordingly. 8. Once the “Neutral” white balance is satisfactory, adjust the “Warm” white balance in the same way. Add a small amount of extra Red Sub-Contrast and Brightness. “Cool” is adjusted adding a small amount of extra Blue Sub-Contrast and Brightness data. Although the above procedure can be somewhat subjective, it has worked
12
2. LCD Television Troubleshooting rather well for CRT-based consumer televisions for many years. It is a viable alternative when a color analyzer is impossible to acquire.
CTV-35
13
Chapter 3 - KLV-26HG2 Troubleshooting Flowcharts Initial Contact Flowchart A
KLV-26HG2 Index Troubleshooting Flowchart A
A Start Initial Analysis
Does unit Turn ON?
No
GO TO Power-ON Troubleshooting Flowchart B
Yes
Is RED LED Flashing? Red LED ON in Standby Green LED flashes and Glows Steady
Yes
GO TO Protection Mode Troubleshooting Flowchart C1, 2, 3
No
Is Video Present? Yes
Is Video Distorted?
Yes
GO TO Video Distortion Troubleshooting Flowchart E
No
No
GO TO No Video Troubleshooting Flowchart D
Is Audio Present?
No
GO TO No Audio Troubleshooting Flowchart F
Yes
GO HOME No Problem Found Unit Fully Operational
CTV-35
14
3. KLV-26HG2 Troubleshooting Flowcharts
Power-ON Troubleshooting Flowchart B KLV-26HG2 Power-ON Troubleshooting Flowchart B B Unit will Not Turn- ON (No Power)
Is RED LED ON?
Press TV POWER Button (Not RemoteControl)
G1-Board
Check Voltage at CN6006/ Pin 1
Press TV or RemoteConrol POWER Button
Does GREEN LED light?
Replace B-Board
Replace G1-Board
No
Yes
Does GREEN LED remain ON?
A1-Board Yes
Check voltage at CN4603/Pin 11
G1-Board
RED LED is Flashing 1.5sec. ON 0.5sec. OFF
Replace B-Board
Is voltage Panel 12V Present?
Yes
Initial Power OK Troubleshoot Video, Panel, or Audio Problem
No
No
IMPORTANT LCD Panel and Board part numbers are serial number dependent. Go to appendix and reference serial number range for proper part number of component .
Yes
No
No
Yes
Is voltage STBY 5V Present?
Check Voltage at CN6006/Pin 3
No
Is voltage 3.2V Present? Yes
Check Voltage at CN2801/Pin 23
Is voltage 3.2V Present?
A1-Board
Replace B-Board
Replace A1-Board
Replace G1-Board
CTV-35
15
3. KLV-26HG2 Troubleshooting Flowcharts
Protection Mode Troubleshooting Flowchart C1
KLV-26HG2 Protection Mode Troubleshooting Flowchart C-1 C-1 Unit Shuts OFF RED LED Flashing
NOTE: All voltages are measured prior to unit shutdown
2sec. ON 2sec . OFF LCD Drive
0.5sec. ON 1.5sec . OFF LCD Panel
G1-Board
Check Voltage At CN6003/ Pins 13
Is Voltage 16.5V Present?
B-Board
Yes
Check Voltage At CN4603/ Pin 24
Check Voltages At CN1003/Pins 18 & 22-25
Are voltages Pin 18 - 5V Pins 22-25 - 3.3V Present?
A1-Board
No
Replace G1-Board
IMPORTANT LCD Panel and Board part numbers are serial number dependent. Go to appendix and reference serial number range for proper part number of component.
Yes Is Voltage 3.3V Present?
No
Replace B-Board
Replace B-Board
No
Replace A1-Board NOTE: Confirm Power Supply operation on both the G1 & A1 boards reference Flowchart B
Yes
Replace LCD Panel Assembly
CTV-35
16
3. KLV-26HG2 Troubleshooting Flowcharts
Protection Mode Troubleshooting Flowchart C2 IMPORTANT LCD Panel and Board part numbers are serial number dependent. Go to appendix and reference serial number range for proper part number of component .
NOTE: Check that the TV is not near other devices that may cause a rise in temperature. Such as, home heating systems.
KLV-26HG2 Protection Mode Troubleshooting Flowchart C-2
C-2 Unit Shuts OFF RED LED Flashing
NOTE: All voltages are measured prior to unit shutdown
1sec. ON 1sec. OFF Temperature
1.5sec . ON 0.5sec. OFF Power Supply
Confirm acceptable local external environment temperature
Check Voltage at CN6003/ Pin 13
Is temperature < 75 degrees Celsius Present?
G1-Board
No
Move TV into an acceptable environment and Re-Test
Is Voltage 16.5V Present?
Normal temperature to Yes the touch
Replace B-Board
No
Replace G1-Board
A1-Board
Check Voltage at CN4601/ Pins 5-7
Is voltage 6.8V Present? Yes
CTV-35
Is voltage 3V Present?
Yes
Yes Excessive temperature to the touch Is Replace Temperature No of LCD Panel LCD Panel only warm to the Assembly touch?
Check Voltage at CN4603/ Pin 20
Replace G1-Board
No
Replace A1-Board
Yes Check Voltage at CN4603/ Pin 19
Is voltage 2.75V Present? No
A1-Board
A1-Board
No
Replace A1-Board
Yes
Replace B-Board
17
3. KLV-26HG2 Troubleshooting Flowcharts
No Video Troubleshooting Flowchart D
D
KLV-26HG2 No Video Troubleshooting Flowchart D
No Video
Is Video Missing on All Inputs ? 1,2,3 etc.
Check Memory Stick Input
Yes
Is Voltage 12V Present?
No
Is Video or Pictures Displayed?
Check External Device and Separate Connections Swap Devices and Connections
Yes
Replace A1-Board
Are External Devices and Connections OK?
Does User Menu Display?
No
G1-Board
Check Voltage at CN6003/ Pins 5-7
No
B-Board
Replace A1-Board
CTV-35
Yes
Is Voltage 6V Present?
No
Check Voltage at CN5801/ Pins 1&2
No
Replace A1-Board
Yes
Check LVDS Cable Connections between B Board & LCD Panel Assb.
No
Turn ON User Menu TV OK Repair External Yes Devices or Connections and Re-Test
IMPORTANT LCD Panel and Board part numbers are serial number dependent. Go to appendix and reference serial number range for proper part number of component.
Yes
Replace B-Board
LVDS Cable Connections OK?
No
Repair LVDS Cable Connection and Re-Test
Yes
Replace LCD Panel Assembly
Replace G1-Board
18
3. KLV-26HG2 Troubleshooting Flowcharts
Video Distortion Troubleshooting Flowchart E
KLV-26HG2 Video Distortion Troubleshooting Flowchart E E Video Distorted
Check Memory Stick Input
Is Distortion on All Video Inputs ? 1,2,3 etc.
Yes
Replace A1-Board
No
TV OK Repair External Bad Devices or Connections
No
Is Memory Stick Video or Pictures Distorted? Yes
Turn ON USER MENU
Check External Device and Connections Swap Devices and connections
Replace B-Board
Good
No
Is Distortion in USER MENU?
Yes Video 1, 2 Distorted Video 3, 4 OK
Replace B-Board
CTV-35
Video 1, 2 OK Video 3, 4 Distorted
Replace A1-Board
Is Distortion Stationary Missing Horizontal or Vertical Lines. Or Missing Pixels?
No
Replace B-Board
Yes
Replace LCD Panel Assembly
IMPORTANT LCD Panel and Board part numbers are serial number dependent. Go to appendix and reference serial number range for proper part number of component.
19
3. KLV-26HG2 Troubleshooting Flowcharts
No Audio Troubleshooting Flowchart F
KLV-26HG2 No Audio Troubleshooting Flowchart F
F NOTE: Confirm all DC Voltages to circuit boards before replacing
No Audio (Speaker Outputs)
Is Audio Missing on All Inputs ? 1,2,3 etc.
No
Check External Devices and Connections Swap Devices and connections
Bad
TV OK Repair External Devices or Connections
No Audio Tuner Input **ONLY**
Replace TU-Board
No Audio Memory Stick Input **ONLY**
Replace MSX & MSBoard
Yes
Check Voltage at CN4601/ Pins 1&2
Replace G1-Board
No
Is Voltage 12V Present? Yes
Check Speaker Connections on A1-Board
Replace A1-Board
Yes
Connections OK? No
Repair Speaker Connections
CTV-35
Good
Check Individual Audio Inputs
No Audio Inputs 1 **ONLY**
Replace U1-Board
No Audio Input 2 **ONLY**
Replace H2-Board
No Audio Inputs 3 **ONLY**
Replace A1-Board
No Audio Input 4 **ONLY**
Replace UD-Board
IMPORTANT LCD Panel and Board part numbers are serial number dependent. Go to appendix and reference serial number range for proper part number of component .
20
Chapter 4 - KLV-32M1 Troubleshooting Flowcharts Initial Contact Flowchart A
KLV-32M1 Index Troubleshooting Flowchart A
A Start Initial Analysis
Does unit Turn ON?
No
GO TO Power-ON Troubleshooting Flowchart B
Yes
Is RED LED Flashing? Red LED ON in Standby Green LED flashes and Glows Steady
Yes
GO TO Protection Mode Troubleshooting Flowchart C1 & 2
No
Is Video Present? Yes
Is Video Distorted?
Yes
GO TO Video Distortion Troubleshooting Flowchart E
No
No
GO TO No Video Troubleshooting Flowchart D
Is Audio Present?
No
GO TO No Audio Troubleshooting Flowchart F
Yes
GO HOME No Problem Found Unit Fully Operational
CTV-35
21
4. KLV-32M1 Troubleshooting Flowcharts
Power-ON Troubleshooting Flowchart B
KLV-32M1 Power-ON Troubleshooting Flowchart B
B
Press TV POWER Button (Not RemoteControl)
Unit will Not Turn- ON (No Power)
Is RED LED ON?
No
Does GREEN LED light?
No
Yes
How many Initial Relay Clicks are heard? 0 or 1
AU-Board
Check Voltage at CN651/Pin 14
Check connections CN7000 & CN5504
Is voltage STBY 5V Present?
Yes
No
Yes
Press TV or RemoteControl POWER Button
GL-Board
Connections OK?
No
Repair connections
Yes
Replace BL-Board A-1052-703-A
Replace GL-Board A-1052-705-A 1
0 GL-Board
Check Voltage at CN651/Pin 15
Does GREEN LED remain ON?
Yes
Check voltage at CN5504/Pin A 43
No
Replace GL-Board A-1052-705-A
Yes
Is voltage 3.2V Present?
RED LED is Flashing 1.5sec. ON 0.5sec. OFF
No
Replace BL-Board A-1052-703-A
CTV-35
Is voltage Panel 5V Present?
Yes
Initial Power OK Troubleshoot Video, Panel, or Audio Problem
No
Replace AU-Board A-1071-844-A
Replace BL-Board A-1052-703-A
22
4. KLV-32M1 Troubleshooting Flowcharts
Protection Mode Troubleshooting Flowchart C1 KLV-32M1 Protection Mode Troubleshooting Flowchart C-1 C-1 Unit Shuts OFF RED LED Flashing
NOTE: All voltages are measured prior to unit shutdown
2sec. ON 2sec. OFF LCD Drive
0.5sec. ON 1.5sec. OFF LCD Panel
GL-Board
Check Voltage At CN652/ Pins 1-5
Is Voltage 16.5V Present?
BL-Board
Yes
Check Voltage At CN652/ Pin 12
GL-Board
No
Replace GL-Board A-1052-705-A
Check Voltages At CN1001/Pins B45 & A47
Are voltages B45 - 5V A47 - 3.3V Present? Yes
Is Voltage 3.3V Present?
No
Replace BL-Board A-1052-703-A
Replace BL-Board A-1052-703-A
No
Replace AU-Board A-1071-844-A NOTE: Confirm Power Supply operation on both the GL & AU boards reference Flowchart B
Yes
Replace LCD Panel 1-805-640-11 Assembly
CTV-35
23
4. KLV-32M1 Troubleshooting Flowcharts
Protection Mode Troubleshooting Flowchart C2
KLV-32M1 Protection Mode Troubleshooting Flowchart C-2
C-2
NOTE: All voltages are measured prior to unit shutdown
Unit Shuts OFF RED LED Flashing
NOTE: Check that the TV is not near other devices that may cause a rise in temperature. Such as, home heating systems.
1sec . ON 1sec. OFF Temperature
1.5sec. ON 0.5sec. OFF Power Supply
Confirm acceptable local external environment temperature
Check Voltage at CN651/ Pins 5-8
Is temperature < 75 degrees Celsius Present?
GL-Board
No
Move TV into an acceptable environment and Re-Test
Is Voltage 10.5V Present?
Normal temperature to Yes the touch
Replace BL-Board A-1052-703-A
CTV-35
Is voltage 8.5V Present? No
Replace GL-Board A-1052-705-A
Yes
Yes Excessive temperature to the touch Is Replace Temperature No LCD Panel of LCD Panel 1-805-640-11 only warm to the Assembly touch?
Check Voltage at CN1001/ pin A47
BL-Board
Check Voltage at CN1001/ Pin B40
Is voltage 8.5V Present? Yes
No
Replace AU-Board A-1071-844-A
BL-Board
No
Replace AU-Board A-1071-844-A
Yes Check Voltage at CN652/ Pins 1-5
GL-Board
Does voltage Increase to 20V before shutdown?
No
Replace BL-Board A-1052-703-A
Yes
Replace GL-Board A-1052-705-A
24
4. KLV-32M1 Troubleshooting Flowcharts
No Video Troubleshooting Flowchart D KLV-32M1 No Video Troubleshooting D Flowchart D No Video
Is Video Missing on All Inputs ? 1,2,3 etc.
Check Voltage at CN9302/ Pin 25
Yes
ULU-Board
Is Voltage 9V Present?
Check External Devices and Separate Connections Swap Devices and Connections
No
Replace ULU-Board A-1052-705-A
CTV-35
Yes
Replace AU-Board A-1071-844-A
Check Voltage at CN4501/ Pins 26-30
Is Voltage 5V Present?
Check for analog component signals on CN9303/ Pins 1,3,5
Are External Devices and Connections OK?
Are signals Present?
Check Voltage at CN9302/ Pins 17-18
Is Voltage 5V Present?
Replace BL-Board A-1052-703-A
Yes
Yes
No
Replace AU-Board A-1071-844-A
Turn ON USER MENU
No
Replace AU-Board A-1071-844-A
Yes
No
ULU-Board
Yes
No
No
TV OK Repair External Yes Devices or Connections and Re-Test
Does USER MENU Display?
No
Replace ULU-Board A-1052-705-A
Check LVDS Cable Connections between BL Board & LCD Panel Assb.
LVDS Cable Connections OK?
No
Repair LVDS Cable Connection and Re-Test
Yes
Replace LCD Panel 1-805-640-11 Assembly
25
4. KLV-32M1 Troubleshooting Flowcharts
Video Distortion Troubleshooting Flowchart E KLV-32M1 Video Distortion Troubleshooting Flowchart E
E Video Distorted
Is Distortion on All Video Inputs ? 1,2,3 etc.
Turn ON USER MENU
Yes
No
Replace BL-Board A-1052-703-A
Yes
No
TV OK Repair External Bad Devices or Connections
Is Distortion in USER MENU?
Check External Devices and Connections Swap Devices and connections
Is Distortion Stationary Missing Horizontal or Vertical Lines. Or Missing Pixels?
No
Replace BL-Board A-1052-703-A
Good Yes
Video 1,2,3, Distorted Video 4, 5 OK
Replace BL-Board A-1052-703-A
CTV-35
Video 1,2,3, OK Video 4, 5 Distorted
Replace LCD Panel 1-805-640-11 Assembly
Replace ULU-Board A-1052-705-A
26
4. KLV-32M1 Troubleshooting Flowcharts
No Audio Troubleshooting Flowchart F
KLV-32M1 No Audio Troubleshooting Flowchart F
F No Audio (Speaker Outputs)
NOTE: Confirm all DC Voltages to circuit boards before replacing No
Is Audio Missing on All Inputs ? 1,2,3 etc.
Check External Devices and Connections Swap Devices and connections
Bad
TV OK Repair External Devices or Connections
Yes Good
Check Center Speaker Input
Is Audio Present at Speakers? No
Check Speaker Connections on AU-Board
Yes
Check Voltage at CN9302/ Pin 25
Is Voltage 9V Present? No
Replace AU-Board A-1071-844-A
Yes
Connections OK? No
Repair Speaker Connections
CTV-35
Check Individual Audio Inputs
Replace AU-Board A-1071-844-A
Yes
Replace ULU-Board A-1052-705-A
No Audio Inputs 1 & 2 **ONLY**
Replace ULU-Board A-1052-705-A
No Audio Input 3 **ONLY**
Replace H3-Board A-1073-555-A
No Audio Inputs 4 **ONLY**
Replace ULU-Board A-1052-705-A
No Audio Input 5 **ONLY**
Replace P-Board A-1052-776-A
No Audio Tuner Input **ONLY**
Replace TUNER 8-598-593-60
27
Chapter 5 - KDL-32/42XBR950 Troubleshooting Flowcharts Initial Contact Flowchart A
KDL32/42XBR950 Initial Contact Flowchart A
A START
Does Unit Turn On?
No
Go To No Power Yes Troubleshooting Flowchart B
Is Video Normal?
No
Go To Video Troubleshooting Flowchart D
Yes
Does Timer LED Ever Flash Red?
Yes
No
No
Does Video Appear ?
Go To Protect Troubleshooting Flowchart C
No
Go To Video Troubleshooting Flowchart D
Audio Present ?
No
Go To Audio Troubleshooting Flowchart E
Yes
FINISHED
Yes
CTV-35
28
5. KDL-32/42XBR950 Troubleshooting Flowcharts
No Power Troubleshooting Flowchart B
KDL32/42XBR950 “No Power” Troubleshooting Flowchart B
B Unit Does Not Turn On
Standby LED Lit on Media Box ? No
Replace Media Receiver Unit
Yes
Flashing Orange ?
Turn Unit On
Yes
Standby LED on Panel Lit ?
No
Check Panel Has AC Power Replace G Board
Yes
Communication Error . Check A/V Cables
CTV-35
Go to Diagnostics Troubleshooting Flowchart B
Steady Green A/10 Seconds?
>10sec
HDCP Key Error Media Receiver or DES Board on Panel
Yes
No
Flashing Red?
Led Flashing ? GREEN
Yes
Flashing Orange ?
RED
Yes
Go to Diagnostics Troubleshooting Flowchart B
Power Circuits OK
29
5. KDL-32/42XBR950 Troubleshooting Flowcharts
Protection Mode Troubleshooting Flowchart C
C
KDL32/42XBR950 “Protect Mode” Troubleshooting Flowchart C
Protect Mode
Standby LED Flashing Red?
Unit Not In Protect Moded No
Yes See Diagnostics Table
KDL32/42XBR950 SELF-DIAGNOSTICS DISPLAY
CTV-35
MEDIA RECEIVER STEADY RED STEADY GREEN
DISPLAY UNIT STEADY RED STEADY GREEN
POSSIBLE CAUSE NORMAL - UNIT IN STANDBY NORMAL - UNIT POWERED ON
NONE NONE
REMEDY
RED FLASHING 9X RED FLASHING 9X RED FLASHING 9X RED FLASHING 9X RED FLASHING 10X RED FLASHING 8X RED FLASHING 6X RED FLASHING 4X ORANGE FLASHING ORANGE FLASHING NO LIGHT
RED/GREEN FLASHING RED FLASHING 7X RED FLASHING 6X RED FLASHING 4X STEADY RED STEADY RED STEADY RED STEADY RED ORANGE FLASHING NO LIGHT ORANGE FLASHING
LCD BACKLIGHT OR INVERTER FAILURE DC DETECT ON SPEAKER LINES LOW B+ DETECT EXCESSIVE PANEL TEMPERATURE OVER-VOLTAGE DETECT OVER-VOLTGE DETECT LOW-VOLTAGE DETECT FAN ROTATION ERROR MEDIA CABLES UNPLUGGED NO POWER TO DISPLAY NO POWER TO MEDIA RECEIVER
REPLACE LCD PANEL K BOARD (32") K1 BOARD (42") REPLACE G BOARD REPLACE G BOARD REPLACE MEDIA RECEIVER REPLACE MEDIA RECEIVER REPLACE MEDIA RECEIVER REPLACE MEDIA RECEIVER CHECK MEDIA CABLES GO TO NO POWER FLOWCHART REPLACE MEDIA RECEIVER
30
5. KDL-32/42XBR950 Troubleshooting Flowcharts
Video Troubleshooting Flowchart D
KDL32/42XBR950 Video Troubleshooting Flowchart D
D
NOTE: The backlight should be on . The unit normally shuts down and goes into panel alarm protect .
Video Problem
Video Present ?
No
Yes
Panel Backlight ON?
No
Replace Panel PN T99861283 (32") T99861284 (42")
Distortion In Video?
Yes
Can OSD Be Displayed?
No
DES Board PN A1302861 A or Media Receiver
Yes
Media Receiver Unit PN T99861282
Yes
No
DONE
CTV-35
31
5. KDL-32/42XBR950 Troubleshooting Flowcharts
Audio Troubleshooting Flowchart E
KDL32/42XBR950 Audio Troubleshooting Flowchart E
E
Audio Problem
Audio Heard ?
No
Standby LED Blinking 7X?
Yes
Yes
K Board (32") PN A1405907 C K1 Board (42") PN A1410280 A
No
Audio Problem All Inputs?
Yes
DES Board PN a1302861 A K Board (32") PN A1405907 C K1 Board (42") PN A1410280 A
No
Media Receiver Unit PN T99861282
Yes
Distorted?
No
DONE
CTV-35
32
Appendix KLV-26HG2 LCD Panel & Board Part# per Unit Serial Number
CTV-35
1
Appendix
KLV-26HG2 LCD Panel & Board Part# per Unit Serial Number Cont.
CTV-35
2
Appendix
KLV-26HG2 Board Location LCD Logic Board (under G1-Board; Under sheild)
G1-Board
Backlight Inverter Board (under Sheild) H1-Board
A1-Board U1-Board
TU-Board
MSB-Board MSX-Board
H3-Board
MS-Board
B-Board
UD-Board
H2-Board
Backlight Return Lines KLV-26HG2 Board Location CTV-35
3
Appendix
KLV-32M1 Board Location LCD Logic Board (under shield )
BL-Board
Backlight Inverter Board (under shield )
Backlight Return Lines (under shield )
GL-Board AU-Board
ULU-Board H1-Board
H3-Board H2-Board (behind ULU -Board)
P-Board (under shield )
KLV-32M1 Board Location CTV-35
4
Appendix
KDL-32/42XBR950 Panel Board Location
KDL-32/42XBR950 Board Location
CTV-35
5
Appendix
KLV-26HG2 Protection Mode Indications and Failure Areas
KLV-32M1 Protection Mode Indications and Failure Areas
CTV-35
6
Appendix
KDL-32/42XBR950 Protection Mode Indications and Failure Areas
CTV-35
7
Appendix
KLV-26HG2 Block Diagrams Power Supply
G1 Board
A1 Board
CN6004
1 \ 16.5V 5
To Inverter Board
13
AC Input
F601
CN6003 16.5V 13
D6000 IC6002 Primary Power Supply
6.8V 17V 33V
17V STBY 5V
Q6007
3.3V Reg
PS4601
Power 3 3.2V 24 from B-Board 3.2V 25 Power 4 from B-Board CN2801
CN4603 IC4601 Secondary Power Supply
PS4602
5 \ 7 1 \ 2
5 \ 7
3.3V to B-Board Memory Stick
1
D3.3V to B-Board
11
12V Panel Volage to Logic Board
CN2801 23
Q4606
3.2V
Power 2 from B-Board
9
9V to B-Board
8
D5V to B-Board
5V Reg
1 \ 2
11
Q4605
9V Reg
CN4601
9V Reg
Audio Circuits
CN4603
Audio
PH6001
PS7001 Amplifier 11
Q6007 IC6001 Standby 5V Power Supply
MSB Board
CN4601
3 1
CN6006
3.2V
Power 1 (ON) from B-Board
PS6450
STBY 5V to B-Board Main Micro
30V Reg
Tuner Board
KLV-26HG2 Power Supply Overall Block
CTV-35
8
Appendix
Protection Circuits G1-Board
LCD Panel Assemble
IC6002 Primary Power Supply UNREG 6V
Backlight Inverter Board
16.5V
CN6003 5 - 7
13
CN4601 5 - 7
13
CN4604 4
D4607
B-Board
3
4V
3.1V
Q4604
13V
CN4603 25
CN1003 1 Panel Detect
3.3V
24
2
16.5V
21
5
Backlight DC IN_ALERT
IC4603 5V Reg
IC1006 Main Micro
R4644 Drive 16 Output
IC4601 Scondary Power Supply
Q4603 12V Reg
Q4605 Panel 12V Switch
D4611
IC4602 9V Reg
D4612
R4642
3V
19
7
5V ALERT
R4643
A1-Board KLV-26HG2 Protection Circuits
CTV-35
6
R4645
2.75V
Power 12 Good
20
3.3V ALERT
I2C
IC1002 Temp
UART
IC7503 Scan Converter
9
Appendix
Video Processing 9V
A1-Board
B-Board
VID
Video 1
U1-Board
Video 2
H2-Board
RF
IC2803 Switcher
V-Chip
9V
Y/CV C
R
TU-Board
IC2511
IC2505 Switcher
Component
V-Chip OSD
B
CCP2
CB CR
5V
Memory Stick Interface
Scan Converter UART
I2C (MS) Digital Component Signal
MS Board Memory Stick Processing
3.3V 2.5V User & Service Mode OSD Generator X5801 33MHz
IC5802
IC1006 Main Micro
X5001 14.32MHz
IC7503
I2C CCP_SW
MSX Board
DRC
MS
MS
J3307 B-Y J3308 R-Y J3309 Y
IC3302
3.3V 2.5V
IC3007
CR
NOTE: DRC 1.8V & 3.3V
1080i, 720p, 480p
480i
C/CB
Y
UD-Board
G
Y/CV
Switcher
DVI
3.3V
IC3600
VID
LCD Drive
X5802 100MHz
3.3V
IC5804
LVDS TX
2.5V 3.3V
Memory Stick OSD Generator
LCD Panel Assemble KLV-26HG2 Video Processing
CTV-35
10
Appendix
Audio Processing H2Board Headphone Output
HP-Mute From B-Board
A1-Board Q7001 Q7002
5V
Video 1
U1-Board
Video 2
H2-Board
RF
DVI
L/R L/R L/R
TU-Board UD-Board
R
9V
IC2803
R R R
IC2801
MS Board
L L
Switcher
R
L
IC7002 Audio Control
IC2802 Switcher
Memory Stick Interface
CTV-35
9V
IC7011
Audio Processor
Q7018 Q7019
9V 12V
12V R L
R L PS7001
J7004 Audio Var/Fix Output
IC7007 Audio Amplifier
Q7007
P-Mute From Secondary Power Supply IC4601
9V L
Memory Stick Processing
MSX Board
L
IC7400 Comparato r
Switcher
L
Component
Q7005 9V Q7006
R
IC7002 HP Amp
SP-Mute From B-Board
KLV-26HG2 Audio Processing
11
Appendix
KLV-32M1 Block Diagrams Power Supply
GL-Board
CN652
RY601
16.5V D6000
AC Input
IC621 10.5V Primary Power Supply 30V
F601 TH601 17V
33V
AU-Board
To Inverter Board
1 \ 5
3.2V
Power 4 from B-Board
3.2V A38
5 \ 8
B38
9V Reg
12
PS7000 1 PS8500 \ 2
IC661 Standby 5V Power Supply
15
3.2V
12
A47
Q7003
A43
Q7002
B39 3.2V B45
1 \ 2
PH662 Q681
IC7002 Secondary Power Supply
5 \ 8
Q661 STBY 5V
CN5504
CN5504
Power 3 from B-Board
PS7001
9V Reg
AU9V (Audio)
B44 17
5V Reg
CN5500
CN651
STBY 5V
30V Reg
Reg 9V to BL -Board Reg 5V to ULU -Board
Tuner
15
A39
14
A50
CN7000
Power 2 from B-Board D5V to BL -Board
Audio Amplifier
CN5504
14
D3.3V to BL -Board 5V Panel Voltage
Power 1 (ON) from BL-Board STBY 5V to BL-Board Main Micro
KLV-32M1 Power Supply Overall Block
CTV-35
12
Appendix
Protection Circuits GL-Board IC621 Primary Power Supply UNREG 10.5V
CN651
CN652
Backlight Inverter Board
11
D702 6.2V CN653 1
5-8
LCD Panel Assemble
12
BL-Board
2
3.2V 4.8V
IC7001 9V Reg IC7000 9V Reg
PS7000
19
IC7002 17 Scondary Power Supply 29 27
Q7001 D5VV SW
Q7000 D3.3V SW
9V R5583 D5504
AU9V
IC7003 5V Reg
IC7005 5V Reg
D5505 R5581 D7003 5.6V
8.5V
R5582
Panel Detect
CN1001 DC-IN ALERT B40
R5580
3V
A41
IC1002 Main Micro
5V ALERT
R5505
Q7003 Panel 5V SW
D7002 3.9V
AU-Board
CTV-35
1
D1002 5.6V
4.9V
3.3V
KLV-32M1 Protection Circuits
CN1004 Backlight 2
A43
A47
Panel 5V
3.3V ALERT I2C
IC1002 Temp
UART
IC7503 Scan Converter
13
Appendix
Video Processing 9V
Video 1 Video 2 Video 3
H3-Board
ULU-Board
BL-Board VID
VID
IC9602 Switcher
Y/CV
9V
C
RF
V-Chip
R
G
IC9801
CR
B
1080i, 720p, 480p
CCP2
Scan Converter
IC9800 Switcher
Component Input
UART
Y
P-Board
CCP_SW
CB
X4001 14.32MHz
IC4007
I2C
HDMI
DRC
3.3V 2.5V
IC2006
J3007 B-Y J3008 R-Y J3009 Y
IC3002
480i
Switcher
Tuner
NOTE: DRC 1.8V & 3.3V
V-Chip OSD
Y/CV C/CB
AU-Board
3.3V
IC2003
Main Micro
5V
X4501 33MHz
LCD Drive
X4502 100MHz
3.3V
IC4504
I2C
User & Service Mode OSD Generator
IC4502
IC1002
CR
3.3V 2.5V
LVDS TX
2.5V 3.3V
LCD Panel Assemble KLV-32M1 Video Processing
CTV-35
14
Appendix
Audio Processing EQ SW From BL-Board
HP-Mute From BL-Board
ULU-Board
AU-Board 9V
Headphone Out Video 3
HDMI
H3-Board
L/R
Q8601 Q8602
L/R 9V
IC9602 Switcher
R R
IC9600
Component
Audio Var/Fix Output Center Speaker Input
Switcher
R L
9V
9V
9V 9V
9V
IC8001
IC800 2 Amp
Audio Selector R L
L
IC9601
L
9V
IC830 0 EQ
IC8100
IC830 1 Amp
Audio Processor
IC8302 Switch IC8303 Switch
R
Switcher
L
R
IC8601 HP Amp Mute
L/R
TU-Board P-Board
Q8603 Q8604
L/R
Video 1 Video 2 RF
Mute
Q8002
Center Speaker SW1
Q8001
Center Speaker SW2
9V
Q8300
IC850 0 Amp
9V
9V L
J9302 TB9300
Mute
IC8602 Amp
IC8600 Switch
9V
9V
IC8501
Audio Q8700 Amplifier PS8500 30V SP-Mute From BLBoard
KLV-32M1 Audio Processing
CTV-35
15
Appendix
KDV-32/42XBR950 Block Diagrams Overall System Block Diagram
MEMORY STICK INPUT
G BOARD
QH BOARD
G1 BOARD (32") G2 BOARD (42")
QT BOARD COMPOSITE VIDEO 1~3 COMPONENT VIDEO 5 & 6
QM BOARD A BOARD
K BOARD (32") K1 BOARD (42") DIC2 BOARD AUDIO DATA (BLACK CONNECTOR)
DVI INPUT FRONT AND REAR iLINK
UD BOARD
DES BOARD M BOARD
MDB-XBR950L MEDIA RECEIVER BOX
VIDEO DATA (WHITE CONNECTOR)
TO LCD PANEL LDM32/4210 LCD DISPLAY
FIGURE 1-1 - KDL32/42XBR950 OVERALL BLOCK DIAGRAM CTV34.1-1
CTV-35
2/10/05
16
Appendix
LCD Panel Power Supply 1
16.5V T6200 D6300 RY6001
RY6000
D6000
AC IN
STBY 6V
SW 24V
PFC CIRCUIT
T6201 D6302 D6303
PFC LVP PROT
RELAY LATCH Q6402 , Q6403
3 4 5
D6301
CONVERTER IC6200 , Q6200 , Q6201
2
CN6300
24V
1 2 3
CN6301
24V OVP T6202 D6304
24V LVP
D6305 KDL42XBR950 ONLY 1
PWR_ON H CONV IC6500 D6500
STBY 6.5V
T6500
2 3 4 4
D6504 TH6000
9
CN6302 G1 BOARD (32") G2 BOARD (42")
FIGURE 1-3 - DISPLAY POWER SUPPLY
CTV-35
CTV34.1-3
7/11/05
17
Appendix
Audio Processing CN5005 CENTER SPEAKER IN RELAY
K2 BOARD
RELAY
(42" ONLY)
AUDIO DATA FROM MEDIA RECEIVER
IC3102 IC3103 LVDS RX SPDIF TX
IC5001 SPDIF TO PCM CONVERTER
DES BOARD IC5002 PCM TO PWM PROOCESS
K BOARD (32") K1 BOARD 42")
IC5003 AUDIO AMPLIFIER
Q5004 ~ 5007 DC DETECT
FIGURE 1-5 - AUDIO PROCESSING
CTV-35
CTV34.1-5
7/11/05
18
and i.Link are trademarks of Sony Electronics
CTV-35
2005 Sony Electronics, Inc. EMCSA - A Service Company 1 Sony Drive Park Ridge, New Jersey 07656 Reproduction in whole or part without written permission is prohibited. All rights reserved
6/29/05
Related Documents
Training Manual
August 2019 33
Training Manual
May 2020 14
Training Manual
July 2020 16
Training Manual
June 2020 14
Smartboard 10 Training Manual
May 2020 23