lcd training ctv35

LCD Direct-View Televisions

Theory of Operation and Troubleshooting

Course: CTV-35

Training Manual

KLV-26HG2

KLV-32M1

KDL-32/42XBR950

CTV-33 i

Chapter 3 - KLV-26HG2 Troubleshooting Flowcharts ..... 14Initial Contact Flowchart A ............................................. Flowchart A ............................................. Flowchart A 14Power-ON Troubleshooting Flowchart B ....................... 15Protection Mode Troubleshooting Flowchart C1 ............ 16Protection Mode Troubleshooting Flowchart C2 ............ 17No Video Troubleshooting Flowchart D ......................... 18Video Distortion Troubleshooting Flowchart E ............... 19No Audio Troubleshooting Flowchart F .......................... 20

Chapter 4 - KLV-32M1 Troubleshooting Flowcharts ....... 21Initial Contact Flowchart A ............................................. Flowchart A ............................................. Flowchart A 21Power-ON Troubleshooting Flowchart B ....................... 22Protection Mode Troubleshooting Flowchart C1 ............ 23Protection Mode Troubleshooting Flowchart C2 ............ 24No Video Troubleshooting Flowchart D ......................... 25Video Distortion Troubleshooting Flowchart E ............... 26No Audio Troubleshooting Flowchart F .......................... 27

Chapter 5 - KDL-32/42XBR950 Troubleshooting Flow-charts .............................................................................. 28

Initial Contact Flowchart A ............................................. Flowchart A ............................................. Flowchart A 28No Power TroubleshootinNo Power TroubleshootinNo Power g Flowchart B ........................ 29Protection Mode Troubleshooting Flowchart C .............. 30Video Troubleshooting Flowchart D ............................... 31Audio Troubleshooting Flowchart E ............................... 32

Introduction .......................................................................... 1Course Overview ............................................................. 1

Chapter 1 - Basic LCD Display Theory ............................. 2

Basic Operation of an LCD Projection Television ............ 2Overview .......................................................................... 2Liquid Crystal Technology ................................................ 2

Light Polarization ................................................................. 2

Liquid Crystals ..................................................................... 3

Creating Color With Liquid Crystals ..................................... 4

Direct-View LCD .................................................................. 5

Chapter 2 - LCD Display Troubleshooting ........................ 6Introduction ...................................................................... 6Video Abnormalities Troubleshooting .............................. 7No video .......................................................................... 7

Backlighting ......................................................................... 7

No Video with Backlighting .................................................. 7

Distorted Video ................................................................ 8Rows or Columns of Pixels Lit or Unlit ................................. 8

Digital Distortion Entire Screen .......................................... 10

Improper Video Level ..........................................................11

White Balance ................................................................11Adjusting White Balance .....................................................11

Adjusting White Balance Without a Color Analyzer ...........Adjusting White Balance Without a Color Analyzer ...........Adjusting White Balance Without a Color Analyzer 12

Table of Contents

CTV-33 ii

Table of Contents

Appendix ............................................................................... 1KLV-26HG2 LCD Panel & Board Part# per Unit Serial

Number ........................................................................Number ........................................................................Number 1KLV-26HG2 LCD Panel & Board Part# per Unit Serial

Number Cont. .............................................................. 2KLV-26HG2 Board Location ............................................ 3KLV-32M1 Board Location ............................................... 4KDL-32/42XBR950 Panel Board Location ....................... 5KLV-26HG2 Protection Mode Indications and Failure Ar-

eas ............................................................................... 6KLV-32M1 Protection Mode Indications and Failure Areas

6KDL-32/42XBR950 Protection Mode Indications and Fail-

ure Areas ..................................................................... 7KLV-26HG2 Block Diagrams ........................................... 8

Power Supply ....................................................................... 8

Protection Circuits ................................................................ 9

Video Processing ............................................................... 10

Audio Processing ................................................................11

KLV-32M1 Block Diagrams ............................................ 12Power Supply ..................................................................... 12

Protection Circuits .............................................................. 13

Video Processing ............................................................... 14

Audio Processing ............................................................... 15

KDV-32/42XBR950 Block Diagrams .............................. 16

Overall System Block Diagram .......................................... 16

LCD Panel Power Supply .................................................. 17

Audio Processing .............................................................. 18

CTV-35 1

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 simpli ed owchart type troubleshooting procedures to effectively and ef ciently 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 speci c) defects that can occur in any LCD base product.

Chapters 3, 4, and 5 provide model speci c owchart type troubleshooting procedures. These owcharts 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 speci c 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 2

Chapter 1 - Basic LCD Display Theory

Basic Operation of Liquid Crystal Display (LCD)

OverviewProjection 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 suf ced 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.

This chapter will cover the basics of the LCD display technology used in todays 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.

Liquid Crystal TechnologyThree 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.

Light PolarizationIn Figure 1-1, an example of how light is affected by polarizing lters is shown. Normal light can be transmitted anywhere along a 360-degree plane. This is especially true for scattered light being re ected off of random surfaces. This is why polarizing sunglasses are so effective.

In this example, a polarizing lter that only allows light on a vertical plane is used to lter the incoming backlight. If another lter 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.

FIGURE 1-1PLOARIZING FILTERS

1. Basic LCD Television

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Liquid CrystalsAlthough 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 speci c pattern. Other differences include how they react to temperature, pressure, magnetic elds, 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 illustrates how the naturally occurring twist in the crystalline layer rotates the incoming polarized light to match the polarized plane of the second lter. In this normal state, the crystals rotate the polarized light 90-degrees to match the plane of the outgoing polarizing lter 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 lter 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 1-2LIQUID CRYSTAL EFFECT ON POLARIZED LIGHT

FIGURE 1-3VOLTAGE EFFECT ON LIQUID CRYSTALS


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Creating Color With Liquid CrystalsAll that is required for LCD pixels to create color is to place a color lter in front of each pixel. By using red, green, and blue color lters, 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 lters and TFT devices are used.

FIGURE 1-4TFT/LCD TECHNOLOGY


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Direct-View LCDThis type of display device uses the methods described previously to generate video by placing vertical columns of red, green, and blue lters 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 90-degrees. 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 1-4TYPICAL DIRECT-VIEW LCD PANEL

CTV-35 6

Chapter 2 - LCD Display Troubleshooting

IntroductionThis 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 xed resolution of the panel. This digital RGB data is allocated to the correct pixel position on the panel by the panel logic circuit.

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 dif cult to discern since the distortion can be caused by the video process circuits rather than those used to control pixel

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 owcharts speci cally tailored for a model or group of models.

Diagnostics procedures that are unique to speci c models are best followed with troubleshooting owcharts speci c to them. This manual will contain such charts located in individual chapters labeled with the model or chassis they are designed for.

2. LCD Television Troubleshooting

CTV-35 7

Video Abnormalities TroubleshootingVideo 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 classi ed and practical approaches applied.

No videoA 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 disquali es 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 owchart speci c to that chassis/model should be used.

BacklightingAll 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 uorescent 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.

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 owchart for that speci c model is the best way to isolate the cause. Veri cation of backlighting should always be the rst step in isolating a no video condition regardless of the presence of protection circuits.

No Video with BacklightingIf backlighting is con rmed, 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 owchart for the speci c model to assist in isolating the problem.


CTV-35 8

Distorted VideoDistortions in the video can be a dif cult 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 classi ed into the following groups:

Unlit or fully lit rows or columns of pixels

Digital distortion across the screen

Improper video level

Dark or colored spots on the screen

Rows or Columns of Pixels Lit or UnlitFully 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 exible 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.

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 eld. Always review the current service policy for a particular model by visiting the ESI website.


CTV-35 9

FIGURE 2-1SAMPLE OF LCD PANEL FAILURES


CTV-35 10

Digital Distortion Entire ScreenUnless 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 2-2 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 2-2DIC2 CIRCUIT FAILURE


CTV-35 11

Improper Video LevelVideo 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.

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.

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 lters could cause a drop in one or more of the primary colors.

White BalanceWhite 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.

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.

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 BalanceThe 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 12

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 CRT-based displays will be familiar with this procedure. They are similar except that CRTs 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 signi cant 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

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 signi cantly 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 nd 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 mid-range. 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


CTV-35 13

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 14

Chapter 3 - KLV-26HG2 Troubleshooting Flowcharts

KLV-26HG2 Index Troubleshooting Flowchart A

StartInitial Analysis

Does unit Turn ON?

Is Video Present?

No

Yes

Is Video Distorted?

Is Audio Present?

Is RED LED Flashing?

No

No

No

No

Yes

Yes

Yes

Yes

Red LED ON in StandbyGreen LED flashes and

Glows Steady

GO TOPower-ON

TroubleshootingFlowchart B

GO TOProtection Mode TroubleshootingFlowchart C1, 2, 3

GO TONo Video

TroubleshootingFlowchart D

GO TOVideo Distortion Troubleshooting

Flowchart E

GO TONo Audio

TroubleshootingFlowchart F

GO HOMENo Problem

FoundUnit Fully

Operational

A

Initial Contact Flowchart A

CTV-35 15

3. KLV-26HG2 Troubleshooting Flowcharts

Power-ON Troubleshooting Flowchart BKLV-26HG2 Power-ON Troubleshooting

Flowchart B

Unit will Not Turn- ON

(No Power)

Is RED LED ON?

No

Yes

Press TV or Remote-Conrol POWER

Button

B

Press TV POWER

Button (Not Remote-

Control)

Does GREEN LED

light?

No

Yes

Check Voltage at CN6006/

Pin 1

Is voltage STBY 5VPresent?

No

Yes

RED LED is Flashing

1.5sec. ON 0.5sec. OFF

G1-Board

Initial Power OK Troubleshoot Video,

Panel, or Audio Problem

Check voltage at CN4603/Pin 11

Is voltage Panel 12VPresent?

No

YesDoes GREEN LEDremain ON?

Yes

No

G1-Board

Check Voltage at

CN6006/Pin 3

Is voltage 3.2V

Present?

Replace G1-Board

Yes

No

Replace G1-Board

Replace B-Board

Check Voltage at

CN2801/Pin 23

Replace B-BoardReplace

B-Board

Is voltage 3.2V

Present?

Replace A1-Board

A1-Board

A1-BoardIMPORTANTLCD Panel and Board part numbers are serial number dependent. Go

to appendix and reference serial number

range for proper part number of component.

CTV-35 16


Protection Mode Troubleshooting Flowchart C1KLV-26HG2 Protection Mode Troubleshooting

Flowchart C-1

Unit Shuts OFFRED LED Flashing

2sec. ON2sec . OFFLCD Drive

Check Voltages At

CN1003/Pins 18 & 22-25

NOTE: All voltages are measured prior to unit shutdown

C-1

0.5sec. ON1.5sec . OFFLCD Panel

Check Voltage

At CN6003/Pins 13

Is Voltage 16.5V

Present?

Replace G1-Board

Replace LCD Panel Assembly

Yes

No

Check Voltage

At CN4603/Pin 24

Is Voltage 3.3V

Present?

Replace B-Board

Yes

No

Are voltages

Pin 18 - 5VPins 22-25 - 3.3V

Present?

Replace A1-Board

Replace B-Board

Yes

No

NOTE: Confirm Power Supply operation on

both the G1 & A1 boards reference

Flowchart B

G1-Board

A1-Board

B-Board

IMPORTANTLCD Panel and Board part numbers are serial number dependent. Go



CTV-35 17


Protection Mode Troubleshooting Flowchart C2

1.5sec . ON0.5sec. OFF

Power Supply

1sec. ON1sec. OFF

Temperature

Confirm acceptable local

external environment temperature

Check Voltage

at CN6003/Pin 13

Is Voltage 16.5V

Present?

Check Voltage

at CN4601/Pins 5-7

Is voltage 6.8V

Present?

Replace G1-Board

A1-Board

No

Yes

Yes

No

G1-Board


C-2KLV-26HG2 Protection Mode Troubleshooting

Flowchart C-2


Is temperature

< 75 degrees CelsiusPresent?

Is Temperature of LCD Panel

only warm to the touch?

Move TV into an acceptable environment and Re-Test

NOTE: Check that the TV is not near other

devices that may cause a rise in temperature.

Such as, home heating systems.

No

Yes


Replace B-Board

No

Excessive temperature to the touch

YesNormal temperature to the touch

Replace G1-Board

Check Voltage

at CN4603/Pin 20

Is voltage 3V

Present?

Replace A1-Board

No

Yes

Check Voltage

at CN4603/Pin 19

Is voltage2.75V

Present?

Replace A1-Board

Replace B-Board

No

Yes

A1-Board

A1-Board




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No Video Troubleshooting Flowchart D

KLV-26HG2 No Video Troubleshooting Flowchart D

No Video

Is Video Missing on All Inputs ?

1,2,3 etc.

No

Yes

D

Check External Device

and Separate ConnectionsSwap Devices

and Connections

Are External Devices and Connections

OK?

TV OKRepair External

Devices orConnections and

Re-Test

Check Voltage at CN6003/Pins 5-7

Replace A1-Board

Replace G1-Board

Is Voltage

6VPresent?

G1-Board

Yes No

Yes

No

Check Memory Stick

Input

Is Video or Pictures

Displayed?

No

Turn ON User Menu

Yes

Does User Menu

Display?

Replace B-Board

No

Check Voltage at CN5801/Pins 1&2

Yes

Is Voltage

12VPresent?

Replace A1-Board

No

Yes


Repair LVDS Cable

Connection and Re-Test

LVDS Cable

Connections OK?

No

Yes

Replace A1-Board

B-Board

Check LVDS Cable Connections between B

Board & LCD Panel Assb.

IMPORTANTLCD Panel and Board

part numbers are serial number dependent. Go



CTV-35 19


Video Distortion Troubleshooting Flowchart E

KLV-26HG2 Video Distortion Troubleshooting Flowchart E

Video Distorted

Is Distortion on All Video Inputs ?

1,2,3 etc.

Yes

No

Check External Device

and Connections

Swap Devices and connections

Bad

Good

Video 1, 2 DistortedVideo 3, 4 OK

Video 1, 2 OKVideo 3, 4 Distorted

Is Distortion in USER MENU?

Yes


Devices orConnections

Replace B-Board

Replace A1-Board

Replace B-Board

No

E

Turn ON USER MENU

IsDistortion Stationary

Missing Horizontal or Vertical Lines. Or Missing Pixels?


Replace B-Board

No

Yes

Check Memory Stick

Input

Is Memory Stick

Video or PicturesDistorted?

Replace A1-Board

No

Yes

IMPORTANTLCD Panel and Board

part numbers are serial number dependent. Go



CTV-35 20


No Audio Troubleshooting Flowchart F

KLV-26HG2 No Audio Troubleshooting Flowchart F

Is Voltage12V

Present?

Check Voltage at CN4601/Pins 1&2

No

No Audio(Speaker Outputs)

Is Audio Missing on All Inputs ?

1,2,3 etc.

No

Yes

NOTE: Confirm all DC Voltages to circuit boards

before replacing

Connections OK?

Replace A1-Board

No

Yes

Check Speaker

Connections on A1-Board

Check Individual

Audio Inputs

Check External Devices

and Connections


No Audio Inputs 1 **ONLY**

Replace U1-Board

No Audio Input 2

**ONLY**

Replace H2-Board

Replace A1-Board

No Audio Inputs 3**ONLY**

No Audio Tuner Input **ONLY**

Replace TU-Board

No Audio Input 4

**ONLY**



Good

Bad

Yes

F

Repair Speaker Connections

Replace UD-Board

Replace G1-Board

No Audio Memory Stick

Input **ONLY**

Replace MSX & MS-

Board




CTV-35 21

Chapter 4 - KLV-32M1 Troubleshooting Flowcharts

KLV-32M1 Index Troubleshooting Flowchart A

StartInitial Analysis

Does unit Turn ON?

Is Video Present?

No

Yes

Is Video Distorted?

Is Audio Present?

Is RED LED Flashing?

No

No

No

No

Yes

Yes

Yes

Yes

Red LED ON in StandbyGreen LED flashes and

Glows Steady

GO TOPower-ON

TroubleshootingFlowchart B

GO TOProtection Mode TroubleshootingFlowchart C1 & 2

GO TONo Video

TroubleshootingFlowchart D

GO TOVideo Distortion Troubleshooting

Flowchart E

GO TONo Audio

TroubleshootingFlowchart F

GO HOMENo Problem

FoundUnit Fully

Operational

A


CTV-35 22

4. KLV-32M1 Troubleshooting Flowcharts

KLV-32M1 Power-ON Troubleshooting Flowchart B

Unit will Not Turn- ON

(No Power)

Is RED LED ON?

No

Yes

Press TV or Remote-

Control POWER Button

B

Press TV POWER

Button (Not Remote-

Control)

Does GREEN LED

light?

No

Yes

1

0

How manyInitial

Relay Clicksare heard?

0 or 1

Check Voltage at

CN651/Pin 14

Is voltage STBY 5VPresent?

No

Check connections CN7000 & CN5504

Connections OK?

AU-Board

NoYes

Yes

Repair connections

RED LED is Flashing

1.5sec. ON 0.5sec. OFF

GL-Board

Initial Power OK Troubleshoot Video,

Panel, or Audio Problem

Check voltage at CN5504/Pin A43

Is voltage Panel 5VPresent?

No

Yes

Does GREEN LEDremain ON?

Yes

No

GL-Board

Check Voltage at

CN651/Pin 15

Is voltage 3.2V

Present?

Replace BL-Board

A-1052-703-A

Replace GL-Board

A-1052-705-A

Yes

No

Replace AU-Board

A-1071-844-A

Replace GL-Board

A-1052-705-A

Replace BL-Board

A-1052-703-A

Replace BL-Board

A-1052-703-A

Power-ON Troubleshooting Flowchart B

CTV-35 23


Replace AU-Board

A-1071-844-A

KLV-32M1 Protection Mode Troubleshooting Flowchart C-1


2sec. ON2sec. OFFLCD Drive

Check Voltages At

CN1001/Pins B45 & A47


C-1

0.5sec. ON1.5sec. OFFLCD Panel

Check Voltage

At CN652/Pins 1-5

Is Voltage 16.5V

Present?

Replace LCD Panel

1-805-640-11 Assembly

Yes

No

Check Voltage

At CN652/Pin 12

Is Voltage 3.3V

Present?

Yes

No

Are voltages B45 - 5V

A47 - 3.3VPresent?

Yes

No

NOTE: Confirm Power Supply operation on both the GL & AU boards reference

Flowchart B

GL-Board

GL-Board

BL-Board

Replace GL-Board

A-1052-705-A Replace BL-Board

A-1052-703-A

Replace BL-Board

A-1052-703-A


CTV-35 24


1.5sec. ON0.5sec. OFF

Power Supply

1sec . ON1sec. OFF

Temperature

Confirm acceptable local

external environment temperature

Check Voltage

at CN651/Pins 5-8

Is Voltage 10.5V

Present?

Check Voltage

at CN1001/Pin B40

Is voltage 8.5V

Present?

BL-Board

No

Yes

Yes

No

GL-Board


C-2 KLV-32M1 Protection Mode Troubleshooting Flowchart C-2


Is temperature

< 75 degrees CelsiusPresent?

Is Temperature of LCD Panel

only warm to the touch?

Move TV into an acceptable environment and Re-Test

NOTE: Check that the TV is not near other

devices that may cause a rise in temperature.

Such as, home heating systems.

No

Yes

Replace LCD Panel

1-805-640-11Assembly

No

Excessive temperature to the touch

YesNormal temperature to the touch

Check Voltage

at CN1001/pin A47

Is voltage 8.5V

Present?

No

Yes

Check Voltage

at CN652/Pins 1-5

Does voltage

Increase to 20V before shutdown?

No

Yes

BL-Board

GL-Board

Replace BL-Board

A-1052-703-A

Replace BL-Board

A-1052-703-AReplace

AU-BoardA-1071-844-A

Replace AU-Board

A-1071-844-A

Replace GL-Board

A-1052-705-A

Replace GL-Board

A-1052-705-A


CTV-35 25


KLV-32M1 No Video Troubleshooting Flowchart D

No Video

Is Video Missing on All Inputs ?

1,2,3 etc.

No

Yes

D


and Separate Connections

Swap Devices and Connections

Are External Devices and Connections

OK?


Devices orConnections and

Re-Test


Pins 17-18

Replace ULU-Board

A-1052-705-A

Is Voltage

5VPresent?

ULU-Board

Yes No

Yes

No


Pin 25

Is Voltage

9VPresent?

ULU-Board

No

Turn ON USER MENU

Check for analog

component signals on CN9303/Pins 1,3,5

Yes

Are signalsPresent?

Does USER MENU

Display?

No

Yes

No


Pins 26-30

Yes

Is Voltage

5VPresent?

Check LVDS Cable Connections between BL Board & LCD Panel

Assb.

No

Yes

Repair LVDS Cable

Connection and Re-Test

LVDS Cable

ConnectionsOK?

No

Yes

Replace LCD Panel


Replace AU-Board

A-1071-844-A

Replace AU-Board

A-1071-844-A

Replace AU-Board

A-1071-844-A

Replace BL-Board

A-1052-703-A

Replace ULU-Board

A-1052-705-A

No Video Troubleshooting Flowchart D

CTV-35 26


KLV-32M1 Video Distortion Troubleshooting Flowchart E

Video Distorted

Is Distortion on All Video Inputs ?

1,2,3 etc.

Yes

No


and Connections


Bad

Good

Video 1,2,3, DistortedVideo 4, 5 OK

Video 1,2,3, OKVideo 4, 5 Distorted

Is Distortion in USER MENU?

Yes



No

E

Turn ON USER MENU

IsDistortion Stationary

Missing Horizontal or Vertical Lines. Or Missing Pixels?

No

Yes

Replace ULU-Board

A-1052-705-A

Replace BL-Board

A-1052-703-A

Replace BL-Board

A-1052-703-A

Replace BL-Board

A-1052-703-A

Replace LCD Panel


Video Distortion Troubleshooting Flowchart E

CTV-35 27


KLV-32M1 No Audio Troubleshooting Flowchart F

Is Audio Present at Speakers?

Check Center

Speaker Input

No

No Audio(Speaker Outputs)

Is Audio Missing on All Inputs ?

1,2,3 etc.

No

Yes

NOTE: Confirm all DC Voltages to circuit boards

before replacing

Connections OK?

No

Yes

Check Speaker

Connections on AU-Board

Check Individual

Audio Inputs


and Connections


No Audio Inputs 1 & 2

**ONLY**

No Audio Input 3

**ONLY**

Replace H3-Board

A-1073-555-A

No Audio Inputs 4**ONLY**

No Audio Tuner Input

**ONLY**

Replace TUNER

8-598-593-60

No Audio Input 5

**ONLY**



Good

Bad

Yes

F

Check Voltage

at CN9302/Pin 25

Is Voltage 9V

Present?

Yes

No

Repair Speaker Connections

Replace P-Board

A-1052-776-A

Replace AU-Board

A-1071-844-A

Replace AU-Board

A-1071-844-A

Replace ULU-Board

A-1052-705-A

Replace ULU-Board

A-1052-705-A

Replace ULU-Board

A-1052-705-A

No Audio Troubleshooting Flowchart F

CTV-35 28

Chapter 5 - KDL-32/42XBR950 Troubleshooting Flowcharts

KDL32/42XBR950 InitialContact Flowchart A

START

Does UnitTurn On?

Does Timer LED Ever

Flash Red?

Does Video Appear?

Yes

No

No

Go To Protect Troubleshooting

Flowchart C

No

Go To Video Troubleshooting

Flowchart D

Go To Audio Troubleshooting

Flowchart E

FINISHED

A

Go To No Power Troubleshooting

Flowchart B

Yes

Yes

Is Video Normal?

Yes

No Go To Video Troubleshooting

Flowchart D

Audio Present ?

Yes

No

No


CTV-35 29

5. KDL-32/42XBR950 Troubleshooting Flowcharts

KDL32/42XBR950 No Power Troubleshooting Flowchart B

Unit Does Not Turn On

No

Yes

RED

>10sec

Power Circuits OK

StandbyLED Lit on

Media Box?

Led Flashing ?

Steady Green A/10 Seconds?

Yes

Replace MediaReceiver Unit

Standby LED on Panel Lit?

Check Panel Has AC Power

Replace G Board

Yes

Flashing Orange?

Yes Communication Error . Check A/V

Cables

Flashing Red?Go to Diagnostics Troubleshooting

Flowchart B

No

Yes

Turn Unit On

Go to Diagnostics Troubleshooting

Flowchart B

GREEN

HDCP Key ErrorMedia Receiver or

DES Board on Panel

No

Flashing Orange?

Yes

B

No Power Troubleshooting Flowchart B

CTV-35 30


KDL32/42XBR950 Protect Mode Troubleshooting Flowchart C

Protect Mode

Yes

Unit Not In Protect Moded

Standby LED Flashing Red?

C

No

See Diagnostics Table

MEDIA RECEIVER DISPLAY UNIT POSSIBLE CAUSE REMEDYSTEADY RED STEADY RED NORMAL - UNIT IN STANDBY NONESTEADY GREEN STEADY GREEN NORMAL - UNIT POWERED ON NONE

RED FLASHING 9X RED/GREEN FLASHING LCD BACKLIGHT OR INVERTER FAILURE REPLACE LCD PANELRED FLASHING 9X RED FLASHING 7X DC DETECT ON SPEAKER LINES K BOARD (32") K1 BOARD (42")RED FLASHING 9X RED FLASHING 6X LOW B+ DETECT REPLACE G BOARDRED FLASHING 9X RED FLASHING 4X EXCESSIVE PANEL TEMPERATURE REPLACE G BOARDRED FLASHING 10X STEADY RED OVER-VOLTAGE DETECT REPLACE MEDIA RECEIVERRED FLASHING 8X STEADY RED OVER-VOLTGE DETECT REPLACE MEDIA RECEIVERRED FLASHING 6X STEADY RED LOW-VOLTAGE DETECT REPLACE MEDIA RECEIVERRED FLASHING 4X STEADY RED FAN ROTATION ERROR REPLACE MEDIA RECEIVERORANGE FLASHING ORANGE FLASHING MEDIA CABLES UNPLUGGED CHECK MEDIA CABLESORANGE FLASHING NO LIGHT NO POWER TO DISPLAY GO TO NO POWER FLOWCHARTNO LIGHT ORANGE FLASHING NO POWER TO MEDIA RECEIVER REPLACE MEDIA RECEIVER

KDL32/42XBR950 SELF-DIAGNOSTICS DISPLAY

Protection Mode Troubleshooting Flowchart C

CTV-35 31


KDL32/42XBR950 Video Troubleshooting Flowchart D

Video Problem

Yes

No

DONE

Video Present ?

Distortion In Video?

Yes

D

No

NOTE: The backlight should be on . The unit normally shuts down and goes into

panel alarm protect .

PanelBacklight ON?

Can OSD Be Displayed?

No

Yes No

Yes

Media Receiver UnitPN T99861282

DES Board PN A1302861 A

or Media Receiver

Replace PanelPN T99861283 (32")

T99861284 (42")

Video Troubleshooting Flowchart D

CTV-35 32


KDL32/42XBR950 Audio Troubleshooting Flowchart E

Audio Problem

Yes

No

DONE

Audio Heard?

Distorted?Yes

E

No Standby LED Blinking 7X?

Audio Problem All Inputs?

No

Yes No

Yes

Media Receiver UnitPN T99861282

K Board (32")PN A1405907 CK1 Board (42")PN A1410280 A

DES BoardPN a1302861 AK Board (32")

PN A1405907 CK1 Board (42")PN A1410280 A

Audio Troubleshooting Flowchart E

CTV-35 1

AppendixKLV-26HG2 LCD Panel & Board Part# per Unit Serial Number

CTV-35 2

Appendix

KLV-26HG2 LCD Panel & Board Part# per Unit Serial Number Cont.

CTV-35 3

Appendix

Backlight Inverter Board(under Sheild)

U1-Board

MSB-BoardMSX-Board

TU-Board

A1-Board

LCD Logic Board(under G1-Board; Under sheild)

H2-Board

H1-Board

H3-Board MS-BoardB-Board UD-Board

G1-Board

KLV-26HG2 Board Location

Backlight Return Lines

KLV-26HG2 Board Location

CTV-35 4

Appendix

Backlight Inverter Board (under shield )

GL-Board

ULU-BoardH1-Board H2-Board(behind ULU -Board)

H3-Board

P-Board(under shield )

AU-Board

Backlight Return Lines

(under shield )

LCD Logic Board (under shield ) BL-Board

KLV-32M1 Board Location

KLV-32M1 Board Location

CTV-35 5

Appendix

KDL-32/42XBR950 Board Location

KDL-32/42XBR950 Panel Board Location

CTV-35 6

Appendix

KLV-26HG2 Protection Mode Indications and Failure Areas

KLV-32M1 Protection Mode Indications and Failure Areas

CTV-35 7

Appendix

KDL-32/42XBR950 Protection Mode Indications and Failure Areas

CTV-35 8

Appendix

A1 BoardG1 Board

ACInput

Power 1 (ON)from B-Board

KLV-26HG2 Power Supply Overall Block

STBY 5Vto B-BoardMain Micro

To Inverter Board

F601 IC6002PrimaryPower Supply

IC6001Standby

5VPower Supply

16.5V

17V

6.8V

33V

16.5V

17V

PS4601

IC4601Secondary

PowerSupply

TunerBoard

5V Reg

D5V to B-Board

3.3V to B-BoardMemory

Stick

Audio Circuits

D3.3V to B-Board

12V Panel Volageto Logic Board

9V Reg

9V to B-BoardPS4602

30V Reg

PS6450

9V Reg

PS7001

Audio Amplifier

Power 3from B-Board

Power 4from B-Board

Power 2 from B-Board

MSB Board3.3V Reg

13

5\71\2

11

1\5

CN6004

CN6003

CN6006

13

24

25

5\7

1\2

11

CN4601

CN2801

CN4601

11

1

8

9

CN4603

CN2801

CN4603

PH6001

1

3

Q6007

Q6007

3.2V

3.2V

3.2V

3.2V

D6000

STBY 5V

Q4605

Q460623

KLV-26HG2 Block DiagramsKLV-26HG2 Block DiagramsPower Supply

CTV-35 9

Appendix

IC1006MainMicro

A1-Board

B-Board

IC1002Temp

IC7503Scan

Converter

I2C

IC4601Scondary

PowerSupply

Q460312V Reg

Q4605Panel 12V

Switch

IC46029V Reg

5V ALERT

3.3V ALERT

IC46035V Reg

16.5V DC IN_ALERT

BacklightInverterBoard

G1-Board

IC6002Primary Power

Supply

Backlight

Panel Detect

LCD PanelAssemble

Q4604D4607

D4611

D4612

R4643

R4642

R4644

13V3.3V

4V

12

16

16.5VUNREG 6V

3.1V

3V

2.75V

20

21

19

25

24

CN4603

KLV-26HG2 Protection Circuits

UART

CN6003

4 3CN4604

5 - 7 13

5 - 7 13CN4601

Power Good

DriveOutput

6

5

7

1

2

CN1003

R4645

Protection Circuits

CTV-35 10

Appendix

U1-Board

H2-Board

TU-Board

IC2803Switcher

Video 1

Video 2

IC2511Switcher

Y/CV

C

A1-Board B-Board

UD-BoardDVI

Component

IC2505Switcher

Y

CB

CR

C/CB

CR

VIDVID

IC3600V-Chip

IC3007CCP2

R G B

IC3302DRC

IC7503Scan

Converter

IC5802LCD Drive

LCD Panel Assemble

IC5804LVDS TX

Memory Stick Processing

MS Board

Memory Stick Interface

MSX Board

480i

1080i, 720p, 480p

User & Service Mode OSD Generator

Memory Stick OSD

Generator

V-Chip OSD

KLV-26HG2 Video Processing

RF

(MS) Digital Component Signal

IC1006MainMicro

CCP_SW

I2C

I2C

J3307B-Y

J3308R-Y

J3309Y

X500114.32MHz

X580133MHz

X5802100MHz

MS MS

Y/CV

UART

3.3V

3.3V2.5V

3.3V2.5V

9V

5V

9V

3.3V

3.3V

2.5V

NOTE: DRC 1.8V & 3.3V

Video Processing

CTV-35 11

Appendix

U1-Board

H2-Board

TU-Board

IC2803Switcher

Video 1

Video 2

A1-Board

UD-BoardDVI

Component

IC2801Switcher

RF

IC2802Switcher

Memory Stick Processing

MS Board

Memory Stick Interface

MSX Board

R

R

R

L

L

L

L/R

L/R

L/R

R

L

IC7002Audio

Control

R IC7007Audio

Amplifier

IC7011Audio

ProcessorL L

R

IC7400Comparato

r

IC7002HP Amp

Headphone Output

H2Board

J7004Audio

Var/FixOutput

KLV-26HG2 Audio Processing

RL

R L

SP-MuteFrom B-Board

Q7007

Q7005Q7006

HP-MuteFrom B-Board

Q7001Q7002

P-MuteFrom Secondary

Power SupplyIC4601

Q7018Q7019

5V

9V

9V

9V

9V

9V

12V

12VPS7001

Audio Processing

CTV-35 12

Appendix

KLV-32M1 Block DiagramsKLV-32M1 Block DiagramsPower Supply

AU-BoardGL-Board

Power 1 (ON)from BL-Board

KLV-32M1 Power Supply Overall Block

STBY 5Vto BL-BoardMain Micro

To Inverter Board

IC621PrimaryPower Supply

10.5V

30V

33V

16.5V

17V

IC7002Secondary

PowerSupply

Audio Amplifier

Tuner

IC661Standby

5VPower Supply

PH662

Power 3from B-Board

Power 4from B-Board

AU9V(Audio) Reg 9V to BL

-BoardReg 5V to ULU

-Board

9V Reg

9V Reg

5V Reg

Q681

Q661

Q7002

Q70033.2V

3.2V

3.2V

3.2V

D3.3V to BL-Board

5V Panel Voltage

D5V to BL-Board

Power 2 from B-Board

STBY 5V

PS7000

PS8500

PS7001

F601ACInput

D6000

RY601

TH601

1\5

5\8

1\2

12

15

14

CN652

CN651

5\8

30V Reg

1\2

12

15

14

B38

A38

CN7000

CN5504A47

A43

B39

B45

B44

17

A39

A50

CN5504

CN5504

CN5500

STBY 5V

CTV-35 13

Appendix

Protection Circuits

IC1002MainMicro

AU-Board

BL-Board

IC1002Temp

IC7503Scan

Converter

I2C

IC7002Scondary

PowerSupply

Q7001D5VV SW

5V ALERT

3.3V ALERT

8.5V DC-IN ALERT

Backlight

Panel Detect

LCD PanelAssemble

D10025.6V

3.2V

4.8V

29

19

AU9V

UNREG 10.5V

3.3V

A41

B40

A47

KLV-32M1 Protection Circuits

D7026.2V

IC70019V Reg

D5504

R5583

R5580

9V

IC70009V Reg

IC70035V Reg

PS7000 IC70055V Reg

R5582

R5505

UART

17

27

Q7000D3.3V

SW

D5505 R5581

D70035.6V

D70023.9V

Q7003Panel 5V

SW

Panel 5V

GL-Board

IC621Primary Power

Supply11

12

BacklightInverterBoard

5 - 8 1 2CN651 CN653

CN652

A43

2

1

CN1004

CN1001

4.9V

3V

CTV-35 14

Appendix

Video Processing

IC9602Switcher

Video 1Video 2

IC9801Switcher

Y/CV

C

ULU-Board BL-Board

Y/CV

C/CB

CR

VIDVID

IC2003V-Chip

IC2006CCP2

R G B

IC3002DRC

IC4007Scan

Converter

IC4502LCD Drive

LCD Panel Assemble

IC4504LVDS TX

480i

1080i, 720p, 480p

User & Service Mode OSD Generator

V-Chip OSD

KLV-32M1 Video Processing

P-BoardHDMI

Component Input

IC9800Switcher

Y

CB

CR

H3-BoardVideo 3

TunerRF

AU-Board

CCP_SW

I2C

IC1002MainMicro

I2C

J3007B-Y

J3008R-Y

J3009Y

X400114.32MHz

X450133MHz

X4502100MHz

UART

9V

5V

9V

3.3V

3.3V2.5V

3.3V

3.3V

2.5V

3.3V2.5V

NOTE: DRC 1.8V & 3.3V

CTV-35 15

Appendix

Audio Processing

IC8001Audio

Selector

RIC8100

Audio Processor

L

IC8600Switch

IC8601HP Amp

KLV-32M1 Audio Processing

R L

Q8601Q8602

HP-MuteFrom BL-Board

Q8603Q8604

TU-BoardIC9602Switcher

ULU-Board

P-BoardHDMI

Component

IC9600Switcher

RF

IC9601Switcher

R

R

L

L

L/R

R

L

AU-Board

Video 1L/R

Video 2 L/R

L/RH3-Board

Video 3

HeadphoneOut

Center Speaker

Input

R L

TB9300

J9302

IC8602Amp

IC8002

Amp

IC8301

Amp

IC8501Audio

Amplifier

IC8500

Amp

SP-MuteFrom BL-

Board

Q8700

Q8300

Mute

Mute

Mute

Audio Var/Fix Output

Center Speaker

SW2

IC8300

EQ

IC8302Switch

IC8303Switch

EQ SWFrom BL-Board

9V

9V

9V

9V

9V9V

9V

9V

9V

9V

9V

30VPS8500

Q8001

9V 9V

Center Speaker

SW1Q8002

CTV-35 16

Appendix

KDV-32/42XBR950 Block Diagrams

UD BOARD

G BOARD

A BOARD

COMPOSITE VIDEO 1~3

COMPONENTVIDEO 5 & 6

DVI INPUT

FRONT AND REAR iLINK

QT BOARD

QM BOARD

DIC2 BOARD

M BOARD

MDB-XBR950L MEDIA RECEIVER BOX LDM32/4210 LCD DISPLAY

QH BOARD

MEMORY STICK INPUT

DES BOARD

TO LCD PANEL

G1 BOARD (32")G2 BOARD (42")

VIDEO DATA(WHITE CONNECTOR)

AUDIO DATA(BLACK CONNECTOR)

FIGURE 1-1 - KDL32/42XBR950 OVERALL BLOCK DIAGRAM CTV34.1-1 2/10/05

K BOARD (32")K1 BOARD (42")

Overall System Block Diagram

CTV-35 17

Appendix

PFC CIRCUIT

T6200

T6201

1

2

3

5

4

T6202

1

2

3

KDL42XBR950 ONLY

1

2

3

4

4

9

RELAY LATCH Q6402 , Q6403

PFC LVP PROT

24V OVP

24V LVP

STBY6V SW 24V

CONVIC6500 T6500

RY6001 RY6000 D6000

D6500 D6504

TH6000

D6300

D6301

D6302

D6303

D6304

D6305

CN6300

CN6301

CN6302

AC IN

G1 BOARD (32")

G2 BOARD (42")

CONVERTERIC6200 , Q6200 ,

Q6201

FIGURE 1-3 - DISPLAY POWER SUPPLY CTV34.1-3 7/11/05

16.5V

24V

PWR_ON HSTBY 6.5V

LCD Panel Power Supply

CTV-35 18

Appendix

IC3102IC3103

LVDS RXSPDIF TX

IC5001SPDIF TO PCM CONVERTER

IC5002PCM TO PWM PROOCESS

IC5003AUDIO

AMPLIFIER

RELAY

RELAY

CN5005

CENTERSPEAKER IN

K2 BOARD

(42" ONLY)

K BOARD (32")K1 BOARD 42")

DES BOARD

Q5004 ~ 5007DC DETECT

AUDIO DATA FROM MEDIA

RECEIVER

FIGURE 1-5 - AUDIO PROCESSING CTV34.1-5 7/11/05

Audio Processing

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2005 Sony Electronics, Inc.EMCSA - A Service Company

1 Sony DrivePark Ridge, New Jersey 07656

Reproduction in whole or part without written permission is prohibited. All rights reservedCTV-35 6/29/05Reproduction in whole or part without written permission is prohibited. All rights reservedCTV-35 6/29/05Reproduction in whole or part without written permission is prohibited. All rights reserved

IntroductionCourse Overview

Chapter 1 - Basic LCD Display TheoryBasic Operation of an LCD Projection TelevisionOverviewLiquid Crystal TechnologyLight PolarizationLiquid CrystalsCreating Color With Liquid CrystalsDirect-View LCD

Chapter 2 - LCD Display TroubleshootingIntroductionVideo Abnormalities TroubleshootingNo videoBacklightingNo Video with Backlighting

Distorted VideoRows or Columns of Pixels Lit or UnlitDigital Distortion Entire ScreenImproper Video Level

White BalanceAdjusting White BalanceAdjusting White Balance Without a Color Analyzer

Chapter 3 - KLV-26HG2 Troubleshooting FlowchartsInitial Contact Flowchart APower-ON Troubleshooting Flowchart BProtection Mode Troubleshooting Flowchart C1Protection Mode Troubleshooting Flowchart C2No Video Troubleshooting Flowchart DVideo Distortion Troubleshooting Flowchart ENo Audio Troubleshooting Flowchart F

Chapter 4 - KLV-32M1 Troubleshooting FlowchartsInitial Contact Flowchart APower-ON Troubleshooting Flowchart BProtection Mode Troubleshooting Flowchart C1Protection Mode Troubleshooting Flowchart C2No Video Troubleshooting Flowchart DVideo Distortion Troubleshooting Flowchart ENo Audio Troubleshooting Flowchart F

Chapter 5 - KDL-32/42XBR950 Troubleshooting FlowchartsInitial Contact Flowchart ANo Power Troubleshooting Flowchart BProtection Mode Troubleshooting Flowchart CVideo Troubleshooting Flowchart DAudio Troubleshooting Flowchart E

AppendixKLV-26HG2 LCD Panel & Board Part# per Unit Serial NumberKLV-26HG2 LCD Panel & Board Part# per Unit Serial Number Cont.KLV-26HG2 Board LocationKLV-32M1 Board LocationKDL-32/42XBR950 Panel Board LocationKLV-26HG2 Protection Mode Indications and Failure AreasKLV-32M1 Protection Mode Indications and Failure AreasKDL-32/42XBR950 Protection Mode Indications and Failure AreasKLV-26HG2 Block DiagramsPower SupplyProtection CircuitsVideo ProcessingAudio Processing

KLV-32M1 Block DiagramsPower SupplyProtection CircuitsVideo ProcessingAudio Processing

KDV-32/42XBR950 Block DiagramsOverall System Block DiagramLCD Panel Power SupplyAudio Processing

lcd training ctv35

Documents

troubleshooting flowchart

initial contact flowchart

lcd display troubleshooting

kdl3242xbr950 troubleshooting

distorted video

directview lcd

basic lcd display theory

liquid crystals