Toshiba 15VL56B, 20VL56B, 20VL56G Service Manual

FILE NO. 050-200533

SERVICE MANUAL

LCD Color Television

15VL56B 20VL56B

20VL56G

TOSHIBA CORPORATION, 2005

Published in Japan, Sep. 2005 (YC)

TABLE OF CONTENTS

SERVICE SAFETY PRECAUTIONS ................................................................................................................................... 3

HANDLING THE LCD MODULE ......................................................................................................................................... 5

1. SERVICE MODE ............................................................................................................................................................. 7

1-1. STARTING SERVICE MODE.................................................................................................................................... 7

2. ADJUSTMENT ................................................................................................................................................................ 9

2-1. ADJUSTMENT TOOLS AND CONDITIONS ............................................................................................................ 9

2-2. AUTO GAIN/OFFSET ADJUSTMENT ...................................................................................................................... 9

2-3. DDC EDID DATA READ & WRITE ..........................................................................................................................10

3. VCTI FIRMWARE INSTALLATIONS/UPGRADING ....................................................................................................... 20

3-1. VCTI FIRMWARE INSTALLATIONS ....................................................................................................................... 21

3-2. SCALER FIRMWARE INSTALLATIONS .................................................................................................................27

4. TROUBLESHOOTING................................................................................................................................................... 34

5. EXPLODED VIEW ......................................................................................................................................................... 39

6. CHASSIS AND CABINET REPLACEMENT PARTS LIST ............................................................................................ 40

7. PC BOARDS TOP & BOTTOM VIEW............................................................................................................................ 49

8. SCHEMATIC DIAGRAM ................................................................................................................................................ 52

8-1. WIRING DIAGRAM ................................................................................................................................................. 53

8-2. BLOCK DIAGRAM (20VL56B/G) ............................................................................................................................ 54

8-3. BLOCK DIAGRAM (15VL56B)................................................................................................................................ 55

9. SPECIFICATIONS ......................................................................................................................................................... 74

GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

SERVICE SAFETY PRECAUTIONS

• The caution items shown here describe major safety issues and should always be observed.

• The meanings of the various indications are as follows.

WARNING

CAUTION

* Physical damage means major damage to a home, furnishings and other possessions.

Examples of marks

SHOCK HAZARD

PROHIBIT DISASSEM-

BLING

UNPULUG

Indicates a hypothetical situation in which service personnel and nearby third parties, or even end users due to a product defect after the service operation is completed, could possibly be in danger of injury or even death in the event of operational error.

Indicates a hypothetical situation in which service personnel and nearby third parties, or even end users after the service operation is completed, could possibly be in danger of injury, or where there could be physical damage in the event of operational error.

The" indicates caution (including danger and warning).

The actual meaning of this caution is indicated inside the The example shown to the left indicates the danger of "electrical shock".

indicates a forbidden action.

The The actual meaning of this caution is indicated inside the The example shown to the left indicates that disassembly is forbidden.

The

indicates a forced action (an action that must be performed). The actual meaning of this forced action is indicated by The example shown to the left indicates that the power plug must be disconnected.

or nearby illustrations or text.

KEEP CHILDREN

AWAY

UNPULUG

SHOCK HAZARD

USE SPECIFIED

PARTS

CAUTION FOR

WIRING

CAUTION FOR

ASSEMBLING /

WIRING

WARNING

• Always advise users to keep children away. There is danger of injury to children from tools, disassembled products, etc.

• Always disconnect the power plug before starting work whenever power is not required. Failure to disconnect the power plug before starting work can result in electrical shock.

• Depending on the model, use an insulation transformer or wear gloves when servicing with the power on, and disconnect the power plug to avoid electrical shock when replacing parts. In some cases, alternating current is also impressed in the chassis, so electrical shock is possible if the chassis is contacted with the power on.

• Always use the replacement parts specified for the particular model when making repairs. The parts used in products have the necessary safety characteristics such as inflammability, voltage resistance, etc.; therefore, use only replacement parts that have these same characteristics. Use only the specified parts when the

• Parts mounting and routing of the wiring should be the same as that used originally. For safety purposes, insulating materials such as tubing or tape is sometimes used and printed circuit boards are sometimes mounted floating. Also make sure that wiring is routed and clamped to avoid parts that generate heat and which use high voltage. Always follow the original scheme.

• After a repair has been completed, reassemble all disassembled parts, and route and reconnect the wiring, in accordance with the original scheme. Do not allow internal wiring to be pinched by cabinets, panels, etc. Any error in reassembly or wiring can result in electrical leakage, flame, etc., and may be hazardous.

mark is included in a circuit diagram or parts list.

CHECK INSULATION

RESISTANCE

PROHIBIT

REMODELING

• After completing the work, disconnect the power plug from the outlet, remove the antenna, turn on the power switch. Then, use a 500V insulation resistance meter to check the insulation resistance of the antenna terminal, other metallic parts and between the prongs of the power plug to make sure that the insulation resistance is 1M 1 or more. The set will require inspection and repair if the insulation resistance is below this value.

• Never remodel the product in any way. Remodeling can result in improper operation, malfunction, or electrical leakage and flame, which may be hazardous

HANDLING THE LCD MODULE

a n

r r

Safety Precautions

In the event that the screen is damaged or the liquid crystal (fluid) leaks, do not breathe in or drink this fluid. Also, never touch this fluid. Such actions could cause toxicity or skin irritation. If this fluid should enter the mouth, rinse the mouth thoroughly with water. If the fluid should contact the skin or clothing, wipe off with alcohol, etc., and rinse thoroughly with water. If the fluid should enter the eyes, immediately rinse the eyes thoroughly with running water.

Precautions for Handling the LCD Module

CAUTION

The LCD module can easily be damaged during disassembly or reassembly; therefore, always observe the following precautions when handling the module.

1. When attaching the LCD module to the LCD cover, position it appropriately and fasten at the position where the display can be viewed most conveniently.

The metal edges of the LCD module are sharp, handle it with care.

3. If the panel surface becomes soiled, wipe with cotton or soft cloth. If this does not remove the soiling, breathe o the surface and then wipe again. If the panel surface is extremely solied, use a CRT cleane as a cleaner. Wipe off the panel surface by drop the cleane on the cloth. Do not drop the cleaner on the panel. Pa attention not to scratch the panel surface.

4. Leaving water or other fluids on the panel screen for a extended period of time can result in discoloration o stripes. Immediately remove any type of fluid from th screen.

2. Carefully align the holes at all four corners of the LCD module with the corresponding holes in the LCD cover and fasten with screws. Do not strongly push on the module because any impact can adversely affect the performance. Also use caution when handling the polarized screen because it can easily be damaged.

5. Glass is used in the panel, so do not drop or strike wit hard objects. Such actions can damage the panel.

6. CMOS-LSI circuitry is used in the LCD module, so avoi damage due to static electricity. When handling the mod ule, use a wrist ground or anchor ground.

7. Do not expose the LCD module to direct sunlight or strong ultraviolet rays for an extended period of time.

8. Do not store the LCD module below the temperature conditions described in the specifications. Failure to do so could result in freezing of the liquid crystal due to cold air or loss of resilience or other damage.

9. Do not disassemble the LCD module. Such actions could result in improper operation.

10. When transporting the LCD module, do not use packing containing epoxy resin (amine) or silicon resin (alcohol or oxim). The gas generated by these materials can cause loss of polarity.

1.Service Mode

1-1.Starting Service Mode

*Set LCD TV to the normal TV signal receive mode.

Note: In this "Service Mode" section, [ ] shows a button.

1-1-1. Press [MUTE] on the remote control once.

1-1-2. Press [MUTE] again, and press [

Service Menu

Scaler ADCScaler ADC

9883ADC VCTIADC Audio Option 1 Option 2 Option 3 DRX Set NVM Edit Download Reset TV Hotel Mode

FrequencyFrequency 47054705 Gm2221Gm2221 Ver. 3. 22.Ver. 3. 22. VCTiVCTi Ver. 3. 49.Ver. 3. 49.

] on LCD TV.

Scaler version

VCTi version

Service mode displayed on TV screen

Items other than those enclosed by are default settings.

*For EU,Hotel mode setting is not a vailable.

OPTION DEFAULT DATA

15VL56B

Option 1 15VL56B SAV 1 SCART 1 PC 1 Side Comp 0 16:9 0 200 PR 0 Te xt 1 ACMS 1

Option 2 15VL56B HiDev 0 Hotel 0 To p 1 I ll SAVE 0 Turbo Vol 0 Ch/Aus 0

Option 3 15VL56B Language 0 Txt Lang 7 Inch opt 2 PA NE L 0

20VL56B/G

Option 1 20VL56B 20VL56G SAV 1 1 SCART 1 1 PC 1 1 Side Comp 0 0 16:9 0 0 200 PR 0 0 Te xt 1 1 ACMS 1 1

Option 2 20VL56B 20VL56G HiDev 0 0 Hotel 0 0 To p 1 1 I ll SAVE 0 0 Turbo Vol 0 0 Ch/Aus 0 0

Option 3 20VL56B 20VL56G Language 0 0 Txt Lang 7 7 Inch opt 3 3 PA NE L 0 0

2. Adjustment

Note: In this "Adjustment" section, [ ] shows a button.

2-1.Adjustment Tools and Conditions

Tools: Pattern Generator (801GF, MSPG925F) DDC Adjustment Tool PC Remote Control Conditions: Heat Run 30 minutes or more

2-2. Auto Gain/Offset Adjustment

2-2-1. RF Mode Adjustment (normal TV receive mode)

No reguired

2-2-2. Component Mode Adjustment

Preparation

Carry out Heat Run for 30 minutes or more before adjustment (with no RF signal).

1) Connect Y, Pb, and Pr output signals of Pattern Generator to the component jack (Y, Pb, Pr) of LCD TV.

2) Connect Y, Pb, and Pr output signals of Pattern Generator to the component jack (D Jack) of LCD TV.

3) Change the TV input mode to component mode.

4) Select 480p Mode (Y:100% Pb/Pr:75%) in Pattern Generator. Select Pattern 33 (Color Bar Pattern signal) in Pattern Generator (MSPG925F).

5) Go into service mode, and Auto Gain menu appears, and then press VOL [+].

6) Press [OK] to store the adjustment data.

(Adjustment in component mode or PC mode)

2-2-3. PC Mode Adjustment

Preparation

Carry out Heat Run for 30 minutes or more before adjustment (with no RF signal).

Connect Pattern Generator to the 15-pin D-Sub Jack of LCD TV.

1) Change the TV input mode to PC mode.

2) Set Pattern Generator to the following:

15VL56B : XGA (1024x768) 16-step or 11-step grayscale

20VL56B,20VL56G : VGA (640x480) 16-step grayscale

3) Go into service mode, and Auto Gain menu appears, and then press VOL [+].

4) Press [OK] to store the adjustment data.

2-3. DDC EDID Data Read & Write

The following software programs are used to read/write DDC EDID data.

DLPortIO.exe t15.edi t20.edi UserPort.exe UserPort.sys WinEDID_2.0.exe

Be very careful that DDC EDID data read/write varies depending on Operating System conditions of PC.

(See the ﬂ owchart below.)

(Windows/system32/Drivers)

Start

OS: MS Windows 2000, XP

Port Setup: (2-3-1)

Preparation EDID Reading & Writing: (2-3-2)

Conﬁ rmation of Updated EDID Data: (2-3-5)

OS: MS Windows 98

EDID Read: (2-3-3)

EDID Write: (2-3-4)

2-3-1. Port Setup (Windows 2000, XP only)

1) Copy "UserPort.sys" ﬁ le to c:\windows\system32\drivers.

2) Double-click "DLPortIO.exe" to install port setting program.

Double-click "DLPortIO.exe"

3) When the port setting program starts up, the installation program runs automatically. Continue the installation by following instructions on the window.

Click "Next" to continue the installation.

Click "Yes" to continue the installation.

4) Select "Typical" on the Setup Type window and click "Next" to continue.

Select "Typical" and click "Next" to continue.

Click "Next" to continue.

5) Select "Yes, I want to restart.." for PC restart and click "Finish" to complete the installation.

Select "Yes, I want to restart.." and click "Finish" to complete the installation.

6) Double-click "UserPort.exe" to begin the installation.

Double-click "UserPort.exe".

7) Click the numbers in the red circle on the UserPort window, and click "Remove" to remove all default numbers.

Click "Remove" to remove all default numbers.

8) Add data value "300-3FF" to two areas on the UserPort window and click "Add".

After key in Value "300-3FF", click [Add] to store "300-3FF".

9) Conﬁ rm that "300-3FF" is added on the UserPort window. Then update the driver using the following procedure.

Click [Update].

Click [Start].

Click [Exit] to ﬁ nish the setup.

2 1 3

Added Value "300-3FF" appears.

2-3-2. Preparation EDID Reading & Writing

Connect the LCD TV and PC using DDC Jig. (See the ﬁ gure below.)

After connection is completed, turn the power ON of the LCD TV.

LCD TV

Parallel Port

Parallel Port Cable

D-SUB Cable

DDC

ADAPTER

Monitor

Jig

Power inlet

Power LED

ST switch

V-Sync On/Off switch (Switch must be ON.)

Power cord

Power select switch

(

)

OFF

(

)

OFF

2-3-3. EDID Reading

1) Double-click "WinEDID.exe" to read EDID data.

Double-click "WinEDID.exe".

2) The WinEDID window opens. The program might read the current EDID data automatically.

Current EDID data might be displayed on the WinEDID window.

Ignore this error message appearing several times by clicking OK.

2-3-4. EDID Writing

1) Click [Open] on the WinEDID window, and search for EDIC ﬁ le(*.edi) that matches TV size.

t15.edi : 15VL56B

t20.edi : 20VL56B,20VL56G

Click [Open]

2) When the ﬁ le is found, click the ﬁ le to open.

Select EDIC ﬁ le(*.edi) that matches TV size and click [Open]

3) The content of selected EDID ﬁ le is displayed on the WinEDID window. Click [Update].

Note: Do not change any data appeared in User Info.

Content of selected EDID ﬁ le

Do not change

Click [Update]

4) Click [Write] on the WinEDID window to update EDID data.

Click [Write]

5) When checksum error message appears, ignore this error and click [Y]. Upon writing process

completed, "Write Data ....Finished" message will appear.

Click [Y]

Upon writing process completed, "Write Data

....Finished" message will appear.

2-3-5. Conﬁ rmation of Updated EDID Data

Click [Read] to conﬁ rm that the EDID data are written as copied from original data.

Click [Read]

Upon reading process completed, "Read Data

....Finished" message will appear.

3. VCTi Firmware Installation/Upgrading

This LCD TV uses two ﬁ rmware programs.

1. VCTi ﬁ rmware

2. SCALER ﬁ rmware

When the main board or IC200 is replaced, be sure to install the VCTi49xxY firmware. (No program is included in the IC200 spare parts.)

This ﬁ rmware program must also be installed when a new ﬁ rmware upgrade ﬁ le is supplied to improve the performance.

Note: In this "VCTi Firmware Installation/Upgrading" section, [ ] show a clicking point on installation menu.

Firmware version indication



VCTi ﬁ rmware version

Scaler Firmware indication



SCALER ﬁ rmware version

3-1. VCTi Firmware Installation

3-1-1. Preparation

1) Create a new folder on PC and copy the following ﬁ les to the folder.

VCTi_TSBxxx_xxx_Vxxx.bin (Vxxx shows ﬁ rmware version.)



vct49xyi.zip



Setup_Visual_I2C_v3xxx.exe



SetupLptDrv9x010400.exe



Setup_LptDrv_v0202_XP_2000.exe



Note: These software programs are supplied as required.

2) Double-click Setup_Visual_I2C_v3xxx.exe. Continue the installation by following instructions on the window. Click [Finish] at the last to complete the installation.

Click [Yes]

Click [Next] on the Visual I2C Program installation window.

3) Select appropriate driver ﬁ le according to your PC OS.

Windows 98 : SetupLptDrv9x010400.exe

Windows 2000/XP : Setup_LptDrv_v0202_XP_2000.exe

Double-click the ﬁ le appropriate for your PC OS. The following window opens.

Click [I Agree] on the installation window to complete the driver installation.

Click [I Agree] to complete the driver installation.

4) Unzip "vct49xyi.zip" ﬁ le. After unzipping, "vct49xyi.zip" folder will be created.

Unzip "vct49xyi.zip" ﬁ le to create "vct49xyi.zip" folder.

Installation of software programs necessary for "VCTi Firmware Installation/Upgrading" in PC has been completed.

3-1-2. Proceeding VCTi Firmware Upgrading

Preparation: Connect PC and TV using Jig before proceeding.

Disconnect AC power cord of TV.

Connect Jig to PC connector on TV with D-sub cable.

Connect USB connector on Jig to USB connector on PC.

Connect LPT port of Jig to LPT port of PC.

Press the Jig switch down. ( )

Plug the AC power cord to go into standby mode. (The LED lights up red.)

Press the Jig switch again. ( )

Connect USB cable connector (small).

Connect USB cable connector (small) to USB connector on Jig board.

Connect directly to D-sub 25 pin connector on PC.

Connect one D-sub 9 pin cable connector.

Connect USB cable connector (large) to USB connector on PC.

Connect one D-sub 9 pin cable connector to PC connector on TV.

Connect the other D-sub 9 pin cable connector to D-sub 9 pin connector on Jig board.

Vcti Jig board

Connect D-sub 25 pin connector on Jig board directly to D-sub 25 pin connector on PC.

1) Double-click "vcth_tvt.vi2c" ﬁ le in "vct49xyi" folder to install the ﬁ rmware.

Double-click "vcth_tvt.vi2c" ﬁ le.

2) An error message appears. Ignore this message. Click [OK] to continue installation.

Click [OK]

3) The following window appears. Double-click the ﬁ le name next to [Load Bin -> Flash].

Double-click this ﬁ le name

4) The following window appears. Click the button (

…

) at the right end of "Name" to open the

ﬁ le select window.

Click … button

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