Toshiba 32WLT68 Schematic

SERVICE MANUAL

(*1), as indicated by the underlined serial number.

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LCD Color Television

32WLT68

Ver. 1

This model is classified as a green product

This Service Manual describes replacement parts for the green product. When repairing this

green product, use the part(s) described in this manual and lead-free solder (*2).

For (*1) and (*2), refer to

SOLDER

GREEN PRODUCT PROCUREMENT

and

LEAD-FREE

GREEN PRODUCT PROCUREMENT

Corporation recognizes environmental protection as a key management tasks, and is doing its

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The EC is actively promoting the WEEE & RoHS Directives that define standards for

recycling and reuse of Waste Electrical and Electronic Equipment and for the Restriction of

the use of certain Hazardous Substances. From July 1, 2006, the RoHS Directive will

prohibit any marketing of new products containing the restricted substances.

Increasing attention is given to issues related to the global environmental. Toshiba

utmost to enhance and improve the quality and scope of its environmental activities. In line

with this, Toshiba proactively promotes Green Procurement, and seeks to purchase and use

products, parts and materials that have low environmental impacts.

Green procurement of parts is not only confined to manufacture. The same green parts used

in manufacture must also be used as replacement parts.

LEAD-FREE SOLDER

free solder must

free solder may result in damage to the component and or PCB being

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This product is manufactured using lead-free solder as a part of a movement within the

consumer products industry at large to be environmentally responsible. Lead-

be used in the servicing and repair of this product.

WARNING: This product is manufactured using lead free solder.

DO NOT USE LEAD BASED SOLDER TO REPAIR THIS PRODUCT!

The melting temperature of lead-free solder is higher than that of leaded solder by 86ºF to

104ºF (30ºC to 40ºC). Use of a soldering iron designed for lead-based solders to repair

product made with lead-

soldered. Great care should be made to ensure high-quality soldering when servicing this

product especially when soldering large components, through-hole pins, and on PCBs as the

level of heat required to melt lead-free solder is high.

IMPORTANT NOTICE

Through WEB, ver. 6.5 has been released but with it, the linking function in this manual may

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A Known Malfunction

Autodesk® DWF™ Viewer version (Free software provided through WEB)

Use Autodesk DWF Viewer ver. 6.0.

not work properly.

If ver. 6.5 has been installed, uninstall it and reinstall ver. 6.0.

To get ver. 6.0, click the icon, or contact to the nearest Toshiba Service Centre for further

assistance.

Freezing windows opened (Cannot close the open windows)

This may happen occasionally.

In case of encountering this, follow the procedure below.

1. Press [Ctrl], [Alt] and [Delete] keys at the same time to engage windows security

windows.

2. Then, choose TASK manager and Application tab, and select TOSHIBA SERVICE

MANUAL-Microsoft Internet Explorer.

3. Click TASK-end.

Main Window back forwarded

The real cause has not been found yet but with this condition, nothing disturbs the service

manual operation.

Continue to use by operating the windows.

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Precaution when opening the diagrams

While opening the diagrams, the menu in the left frame changes its color to GRAY. This is

an indication that the viewer is processing.

With this condition, the menu indication color may stick to the GRAY color or Windows

may freeze if clicking other menu.

To avoid such things, do not operate any others while menu turns GRAY color.

If entering this, re-open the service manual or refresh the left frame.

IMPORTANT NOTICE

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User Guide

Autodesk® DWF™ Viewer

this system. Please download and install.

When

function and this sample may not work. In that case, perform the Internet Explorer setting

using the following procedure to restore normal operation.

Windows XP SP2

1. Windows version check

[My Computer (right-click)] - [Properties]

is necessary to view drawings and to activate the functions of

is used, pop-up windows are limited by the enhanced security

2. Internet Explorer setting

[Tools] - [Internet Options]

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Operating Environment

PC : Pentium III or higher recommended

Monitor : 1024 x 768 or higher resolution recommended

Mouse : A mouse with wheel recommended

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OS : Microsoft Windows 2000/XP

Browser : Microsoft Internet Explorer 6.0 or later

Drawing viewer : Autodesk DWF Viewer 6.0

* Use the software following respective license terms and conditions.

Note:

In case of using this service manual with network connection, allocate its folder to the client

PCs as

network drive

to avoid any possible malfunction.

Or in case of accessing it through WEB site, the small pop-up window appears at the left

bottom corner on the screen whenever searching the location links. This is not malfunction.

Functions Provided on Each Drawing Page

Parts Information Reference Function

When the character string of a part on the drawing is clicked, its information is popped up at

the location. You can get any parts information immediately on the screen without referring

to the maintenance parts list. 

Parts Search Function

You can search any part within the displayed drawing or within the whole schematic

diagram/board view by specifying a location number. The pop-up window displayed by

clicking a part's character string allows to search the part within the applicable schematic

diagram, board view or spare parts list. 

A circle appears when the part is found, showing the part's location within the drawing. 

Signal Line/Connector Destination Display Function

When a name at the end of a signal line in a divided schematic diagram is clicked, the

destination of the signal is searched and the display changes to the destination. Connecter

destinations can also be searched in the same way.



When two or more search results are provided, their drawing names are displayed, allowing

you to choose a desired drawing to display. 

Layer Display Changing Function

When a pattern on a board view is clicked, it is highlighted in green. This allows easy pattern

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When any of the color buttons on the toolbar is clicked, it can be selected to display desired

layer in its color or not to display each layer. This allows you to see the pattern layer only by

setting other layers to "non-display". 

PC Board View Pattern Highlighting Function

tracing. 

Specified Area Printing Function

The Autodesk DWF Viewer enables to print the displayed drawing region as it is on a

printer. It also allows to print a large-sized drawing in multiple pieces (tile printing). 

IMPORTANT NOTICE

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WARNING:

You are requested that you shall not modify or alter the information or data

provided herein without prior written consent by Toshiba. Toshiba shall not

be liable to anybody for any damages, losses, expenses or costs, if any,

incurred in connection with or as a result of such modification or alteration.

THE INFORMATION OR DATA HEREIN SHALL BE PROVIDED "AS IS"

WITHOUT ANY WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED

WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

PURPOSE.

Toshiba shall not be liable for any damages, losses, expenses or costs, if

any, incurred in connection with or as a result of use of any information or

data provided herein.

ADJUSTMENT

↓↓↓↓

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Service Mode

Entering to Service Mode

1. Set VOLUME to minimum and press button once on remote control.

Service Mode display

2. Press button again and hold button down.

3. While holding the button, press MENU button on TV set.

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Displaying the Adjustment Menu

Press MENU button on TV.

Service Mode

Press

Adjustment Mode

↑↑↑↑ ↓↓↓↓

Press

Key Function in the Service Mode

The following key entry during display of adjustment menu provides special functions.

CAUTION: Never try to perform initialization unless you have changed the

memory IC.

button (on remote control)

Never adjust H.POS and V.POS except PAL/WIDE mode.

Test signal selection

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Selection of the adjustment items

Change of the data value Volume +/- (on TV or remote control)

Adjustment menu mode ON/OFF MENU button (on TV)

Initialization of the memory (QA02) CALL + CH button on TV ( )

Reset the count of operating

protect circuit to "00"

Turn off I2C bus communication CALL + CH button on TV ( )

"RCUT" selection 1 button

"GCUT" selection 2 button

"BCUT" selection 3 button

"CNTX" selection 4 button

"COLC" selection 5 button

"UVTT" selection 6 button

Automatic A/D Adjustment

(PC, Component, Composite (PAL, NTSC))

CH (on TV or remote control)

CALL + CH button on TV ( )

7 button

Self diagnostic display ON/OFF 9 button

Selecting the Adjusting Item

Every pressing of CH button in the service mode changes the adjustment items in the order of table below. ( button for reverse order)

SETTING & ADJUSTING DATA

[ SERVICE MODE ]

ADJUSTING ITEMS AND DATA IN THE SERVICE MODE:

Note:

The image system data of RCUT-BDRV is different by each image format. The PAL value is indicated in the table.

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Item Name of adjustment

RCUT R CUT OFF

GCUT G CUT OFF

BCUT B CUT OFF

RDRV R DRIVE

GDRV G DRIVE

BDRV B DRIVE

BRTC BRIGHTNESS CENTER

COLC COLOR CENTER

UVTT BASE BAND TINT

CNTX CONTRAST MAX

VOLUX MAX VOLUME LIMITED

PLLW0 PLL WAIT TIME

PLLW1 PLL WAIT TIME

PLLW2 PLL WAIT TIME

PLLW3 PLL WAIT TIME

PLLW4 PLL WAIT TIME

PLLW5 PLL WAIT TIME

OPT1 TV SET OPTION 1

OPT2 TV SET OPTION 2 (HOTEL MODE)

OPT3 TV SET OPTION 3

OPT4 TV SET OPTION 4 (PANEL OPT DATA)

OPT5 TV SET OPTION 5 (PANEL OPT DATA)

OPT6 TV SET OPTION 6 (HOTEL MODE)

OPT7 TV SET OPTION 7 (HOTEL MODE)

OPT8 TV SET OPTION 8 (HOTEL MODE)

TVOP TV SET OPTION

ID MODEL ID

BDWID BORDER WIDTH FOR EXACT SCAN

BDHIT BORDER HEIGHT FOR EXACT SCAN

FPLG MASK_ENABLE (SD/HD)

FPLG2 Channel LOGO Vector Clip SW (SD)

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FPLG3 Channel LOGO Vector Clip SW (HD)

Factory preset data will be loaded after setting Model ID data. (Refer to Initialization of Memory Data of QA02 and setting data of signal board.)

Adjusting the Data

Pressing of VOLUME +/- button will change the value of data in the range from 00H to FFH. The variable range depends on the adjusting item.

I2C Bus Off

Turn off I2C communication between IC700 and IC400.

1) Press and hold the CALL button on the remote control, then press the Volume button on the TV.

2) Display "BUS Off" OSD.

3) I2C communication turned off.

Note:

To return Bus on status, press and hold the CALL button on the remote control, then press the Volume button on the TV again. TV will be turned off and automatically turned on, then status will be Bus On.

Setting TVOP

Enter to service mode and select menu of TVOP by pressing P or P during display of adjustment menu. After selecting TVOP, press + or - to set I2C check function to

disable or enable as below.

TVOP FUNCTION DESCRIPTION 1 0 (Normal)

D5 (bit5) I2C check between IC700 and IC400. (WDT) Disable Enable

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Setting Panel Option Data

Panel option data is subject to OP4 and OP5. Enter to service mode and select menu of OPT4 or OPT5 by pressing P or P during

display of adjustment menu. After selecting OPT4 or OPT5, press + or - to set OPT4 or OPT5 value as table below.

Panel option data

Series Model name Panel vendor OPT4 value OPT5 value

WL68 EU Ready 32WL68P AUO 0x45 0x11

37WL68P AUO 0x46 0x11

EU/UK Digital 32WLT68 AUO 0x45 0x11

37WLT68 AUO 0x46 0x11

42WLT68 AUO 0x47 0x11

OP4

Ex. OPT4 value 0xB7 is for 42 inches CMP made 1080p panel.

OPT4

Panel

vender

Inch size 26 - - - - 0 0 1 1

LPL - 0 0 1 - - - -

SHP - 0 1 0 - - - -

CMO - 0 1 1 - - - -

AUO - 1 0 0 - - - -

32 - - - - 0 1 0 1

(bit7)

(bit6)

(bit5)

(bit4)

(bit3)

(bit2)

(bit1)

(bit0)

37 - - - - 0 1 1 0

42 - - - - 0 1 1 1

47 - - - - 1 0 0 0

OP5

OPT5

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AUO Panel PMVA - - 0 - - - - -

AMVA - - 1 - - - - -

100 Hz Drive Off - - - 0 - - - -

On - - - 1 - - - -

Panel

Resolution

WXGA - - - - 0 0 0 1

1080p - - - - 0 0 1 0

(bit7)

(bit6)

(bit5)

(bit4)

(bit3)

(bit2)

(bit1)

(bit0)

Exit from Service Mode

Pressing POWER button to turn off the TV once.

Initialization of Memory Data of QA02 and setting data of signal board.

After replacing QA02 or signal board, the following initialization is required.

CAUTION: Never attempt to initialize the data unless QA02 has been

replaced.

Whenever using new signal board to the set, setting the Model ID data

according to Panel option data.

1) Enter the service mode.

2) Select menu of ID by pressing P or P during display of adjustment menu in the service mode.

3) Change ID data into MODEL ID to initialize by pressing + or -., refer to table below.

4) Press and hold the CALL button on the remote control, then press the CHANNEL button on the TV.

5) Initialization progress dialog including model name and panel vender is shown.

Progress status is "WRITING".

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6) Progress status is changed "OK" and power cycle (automatically). Then QA02 initialization has been completed.

7) Enter the service mode and select version check mode. Confirm if model name and model id set is correct. If not, repeat steps 1) to 6).

Note:

In case initialization by setting wrong MODEL ID is done, there is a possibility of abnormal display.

8) Set I2C check function of TVOP to enable.

9) Check the picture carefully. If necessary, adjust any adjustment item above. Perform "Auto tune" on the ownerЃfs manual.

Europe

MODEL ID (HEX)

Model name Panel vender

0x01 32WLT68 AUO

0x02 37WLT68 AUO

0x03 42WLT68 AUO

0x04 32WL68P AUO

0x05 37WL68P AUO

0x06

0x07

0x08

0x09

0x10

0x11

0x12

0x13

0x14

0x15

0x16

0x17

0x18

0x19

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0x20

0x21

0x22

0x23

0x24

0x25

0x26

0x27

0x28

0x29

0x30

0x31

0x32

0x33

Test Signal Selection

Every pressing of button on the remote control changes the built-in test patterns on screen as described below in Service Mode.

Picture Signal

Red raster

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Green raster

Blue raster

All Black

All White

Self Diagnostic Function

1. Press "9" button on remote control during display of adjustment menu in the service mode. The diagnosis will begin to check if interface among IC's is executed properly.

2. During diagnosis, the following displays are shown.

(1) Firmware :

Version information of microprocessor Series name (AAAA) and market area (BB) and software program version (0000)

(2) Time : Total hour of turn the TV on. (Unit : H)

(3) Bus line : -- "OK" is normal

NG is abnormal (Red indication).

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SCL-GND (Red indication) : SCL-GND short circuit SDA-GND (Red indication) : SDA-GND short circuit SCL-SDA (Red indication) : SCL-SDA short circuit

(4) Bus cont : --- "OK" is normal.

When the abnormal status is detected, type name of semiconductor is indicated in red colour.

(5) Block

UV : TV reception mode V1 - V9 : VIDEO 1-9 input mode PC : PC mode YUV : YUV mode DTV : DTV mode

UV RF

WL68, WLT68

(SCART (FULL))

(SCART (S+AV))

(Composite/Component)

V4 HDMI1

V5 HDMI2

V6 HDMI3

V7 --

V8 --

V9 --

PC PC

YUV --

DTV --

Version Check Mode

1. Press "9" button twice on remote control during display of adjustment menu in the

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service mode. The version of main MPU will be checked.

2. During Version Check, the following displays are shown.

(1) MAIN MPU :

Version information of microprocessor Series name and Code Program Version (4 figure number) and OSD Version (2 figure number).

(2) EEPROM :

Version information of EEPROM : Display 1 byte data.

(3) SUB MPU :

Version information of SUB MPU : Display 1 byte data.

(4) OPTION :

Option information : Display six numbers of 1 byte data.

(5) HDMI ID :

HDMI ID information : Display 4 byte data.

(6) SW Ver

Version information of DB software. (Only digital model.)

(7) MW Ver

NTSC (60 Hz) SD signal (composite input).

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Version information of DB software middleware. (Only digital model)

(8) A/D Adjust

A/D adjustment item.

--MAIN : It's enable only in double Window model. A/D adjustment status of main picture.

--PIP :It's enable only in double Window model. A/D adjustment status of sub picture.

--COMP : Component input

--PC : PC input

--NTSC :

--PAL : PAL (50 Hz) SD signal (composite input).

--OK :A/D adjustment set correctly.

--NG :A/D adjustment set incorrect.

-- : A/D adjustment is not needed. Because its picture format isn't used.

(9) 100 Hz FPGA Software Version

It's enable only in 100 Hz drive panel model. Upper 2 figure number means function versions of double frequency convert. Lower 2 figure number means function version of vector complement.

(10) Memory Data Version

Version information of EEPROM. DRMA**** means model number of EEPROM. REV** means version of EEPROM.

(11) CD number

CD information (ascii code). : Display 4 byte data.

(12) Model Name

Model name information (ascii code). : Display 7 byte data.

(13) LCD Panel Vender information display

The following Panel Vender (DDD) and screen size (00) are displayed. Example : AUO-32 indicates that Vender is AUO and Screen Size is 32 inch

Status Check Mode

1. Press "9" button thrice on remote control during display of adjustment menu in the service mode.

The status of this model will be checked.

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2. During Status Check, the following displays are shown.

(1) MAIN :

Main source information : Display RF position number (0 - 99) on the main screen, or Input Source (EXT1/2/3/HDMI etc.)

(2) MAIN FORMAT :

Display Video and PC format information

(3) MAIN PLL :

Main PLL information : Display 1 byte data at five.

(4) SUB :

Sub source information : Display RF position number (0 - 99) on the Sub screen, or Input Source (EXT1/2/3/HDMI etc.) This item displays only Double window model.

(5) SUB FORMAT :

Display Video and PC format information This item displays only Double window model.

(6) SUB PLL :

Sub PLL information : Display 1 byte data at five. This item displays only Double window model.

(7) SCREEN SIZE :

Display the screen size as follows.

Exact Scan

Wide

Super Live 2

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Cinema 2

4:3

Super Live 1

Cinema 1

Subtitle

14:9

Note:

Exact Scan is shown only for 1080p panel model with video input mode except pc.

(8) OTHER STATUS :

Other status information : Display three numbers of 2 byte data.

Setting Hotel Mode

Enter to service mode and select Hotel Mode menu by pressing P or P . After selecting Hotel Mode, press + to enter details setting in Hotel Mode.

To select menu, press P or P and press OK to enter the adjustment menu of table bellow. To move the cursor in the adjustment, press + or -.

1. By pressing P or P , OPT2 setting will change the value either 1 or 0 on selected items as follows;

OP2

OPT2 FUNCTION DESCRIPTION 1 0 (Normal)

D7 (bit7) - (no use) - -

D6 (bit6) - (no use) - -

D5 (bit5) FRONT Key Disable Enable

D4 (bit4) All keys except input selector key

(Video/TV)

D3 (bit3) User remote control operation Disable

Disable Enable

(Service mode and Supere

User mode may possible to

setting only)

Enable

D2 (bit2) Disable SET UP MENU except

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language.

(tuning SETUP MENU)

D1 (bit1) Disable SETUP MENU Disable Enable

Disable

(Display the language only)

Enable

D0 (bit0) HOTEL Mode On (Enable the setting of D1

from to D7)

Off

(Normal)

VOLUX

Set VOLUX as following.

1) Set speaker volume to 100. (Any value is OK, but 100 is better to check sound level.)

2) Down value of VOLUX until finding suitable sound volume level.

VOLUX FUNCTION DESCRIPTION 1 0 (Normal)

D7 (bit7) ~

D0 (bit0)

Max Limiter of Volume Control 0x00 ~ 0x7F (Normal: 0x7C)

OP6

OPT6 FUNCTION DESCRIPTION 1 0 (Normal)

D7 (bit7) Enable mode that POS or VIDEO program

number will be appeared in forced when turn

ON the main power

D6 (bit6) ~

D0 (bit0)

POS or VIDEO program number 0 ~ 127 [decimal] (Normal: 0)

Enable Disable

POS number: 0 ~ 99

VIDEO number: 100 ~ 127

(DTV = 100, VIDEO = 101,

VIDEO = 102..)

100 is used as ATV when

DTV option is disable.

OP7

OPT7 FUNCTION DESCRIPTION 1 0 (Normal)

D7 (bit7) Enable mode that speaker volume will be set

in forced when turn ON the main power

Enable Disable

D6 (bit6) ~

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D0 (bit0)

Forced speaker volume 0 ~ 100 [decimal] (Normal: 0)

Value above 100 is no effect.

OP8

OPT8 FUNCTION DESCRIPTION 1 0 (Normal)

D7 (bit7) ~

D3 (bit3)

D2 (bit2) Enable mode that picture mode will be set in

forced when turn ON the main power

D1 (bit1) ~

D0 (bit0)

Forced picture mode 0 [dec]: Dynamic (mode-1)

- (no use) - -

Enable

(Display the

language only)

(Normal)

1 [dec]: Standard (mode-2)

2 [dec]: Mild (mode-3)

3 [dec]: Memory (mode-M)

Disable

LED Indication

The Green and Red LEDs on the TV (at the bottom center of the TV) indicate the TV's status, as described below.



Red ON (solid) and Green OFF = The TV power cord is plugged in.



Green ON (solid) and Red ON = The On timer is operating.

1 Green is OFF;

Red blinks continuously at 0.5-

second intervals.

2 Green is OFF;

Red blinks continuously at 1-

second intervals.

LED Indication Condition Solution

Abnormal operation Turn OFF the TV and unplug

the power cord.

Plug the power cord in again

and turn ON the TV.

Abnormal operation of

BUS line.

Turn OFF the TV and unplug

the power cord.

Plug the power cord in again

and turn ON the TV.

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FUNCTION AND OPERATION

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The Remote Control

Simple at-a-glance reference of your remote control.

FUNCTION AND OPERATION

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Control and Input Connection

A wide variety of external equipment can be connected to the input sockets on the side of the

television.

Whilst all the necessary adjustments and controls for the television are made using the remote

control, the buttons on the television may be used for some functions.

Switching On

Using the Remote Control

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