Toshiba 37WL48A Bedienungsanleitung

SERVICE MANUAL

LCD Color TV

37WL48A

37WL48E

37WL48R

37WL48T

FILE NO. 040-200502

Feb. 2005 (YC/X)

TOSHIBA CORPORATION, 2005

TABLE OF CONTENTS

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

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

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

DESIGN MODE.................................................................................................................................................................. 10

LOCATION OF CONTROLS ................................................................................................................................................ 11

LAYOUT OF MAJOR BOARDS ............................................................................................................................................ 14

MECHANICAL DISASSEMBLY .......................................................................................................................................... 15

EXPLODED VIEW ............................................................................................................................................................. 17

PACKING DISASSEMBLY .................................................................................................................................................. 19

CHASSIS AND CABINET REPLACEMENT PARTS LIST ................................................................................................. 21

PC BOARDS TOP & BOTTOM VIEW ............................................................................................................................... 29

BLOCK DIAGRAM ............................................................................................................................................................. 43

SPECIFICATIONS .......................................................................................................................................................... END

APPENDIX:

SCHEMATIC DIAGRAM

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

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.

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

Examples of marks

SHOCK HAZARD

PROHIBIT DISASSEM-

BLING

UNPULUG

The

indicates caution (including danger and warning).

The actual meaning of this caution is indicated inside the

or nearby illustrations or text.

The example shown to the left indicates the danger of "electrical shock".

The indicates a forbidden action.

The actual meaning of this caution is indicated inside the or nearby illustrations or text.

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 -or nearby illustrations or text.

The example shown to the left indicates that the power plug must be disconnected.

GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

WARNING

KEEP CHILDREN

AWAY

UNPULUG

SHOCK HAZARD

USE SPECIFIED

PARTS

CAUTION FOR

WIRING

CAUTION FOR

ASSEMBLING /

WIRING

CHECK INSULATION

RESISTANCE

PROHIBIT

REMODELING

• 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 pos-

sible 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 character-

istics.

Use only the specified parts when the mark is included in a circuit diagram or parts list.

• 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 recon-

nect 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.

• 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 1or 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

GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

HANDLING THE LCD MODULE

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 wa-

ter. 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

The LCD module can easily be damaged during disassembly

or reassembly; therefore, always observe the following pre-

cautions when handling the module.

1. When attaching the LCD module to the LCD cover, posi-

tion it appropriately and fasten at the position where the

display can be viewed most conveniently.

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 mod-

ule because any impact can adversely affect the perform-

ance. Also use caution when handling the polarized screen

because it can easily be damaged.

CAUTION The metal edges of the LCD module

are sharp, so use caution to avoid in-

jury.

3. If the panel surface becomes soiled, wipe with cotton or a

soft cloth. If this does not remove the soiling, breathe on

the surface and then wipe again.

If the panel surface is extremely solied, use a CRT cleaner

as a cleaner.Wipe off the panel surface by drop the cleaner

on the cloth. Do not drop the cleaner on the panel. Pay

attention not to scratch the panel surface.

4. Leaving water or other fluids on the panel screen for an

extended period of time can result in discoloration or

stripes. Immediately remove any type of fluid from the

screen.

5. Glass is used in the panel, so do not drop or strike with

hard objects. Such actions can damage the panel.

6. CMOS-LSI circuitry is used in the LCD module, so avoid

damage due to static electricity. When handling the mod-

ule, use a wrist ground or anchor ground.

GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

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 con-

ditions 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.

SERVICE MODE

1. ENTERING SERVICE MODE

(Service mode display)

Item

Data

or Sound Mute

3) While pressing the obutton,

press MENU button on TV set.

2) Press obutton again and

keep pressing.

2. DISPLAYING THE ADJUSTMENT MENU

1) Press MENU button on TV.

3. KEY FUNCTION IN THE SERVICE MODE

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

Screen adjustment mode ON/OFF: -/-- button (on Remote)

Test signal selection : abutton (on Remote)

Selection of the adjustment items : Channel s/t(on TV or Remote)

Change of the data value : Volume ;+/– (on TV or Remote)

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

Initialization of the memory (QA02) : CALL + Channel button on TV (s)

Reset the count of operating protect

circuit to “00”: CALL + Channel button on TV (t)

“RCUT” selection : 1 button

“GCUT” selection : 2 button

“BCUT” selection : 3 button

“SCNT” selection : 4 button

“COLP” selection : 5 button

“TNTC” selection : 6 button

Convergence adj : YELLOW button

Self diagnostic display ON/OFF : 9 button

1) Press obutton once on

Remote Control.

Adjustment mode

Press

Service mode

Item

Data

Color thickness correction

note: Displayed differently as shown below, de-

pending on the setting of the receiving color

system.

COLP (PAL)

COLC (NTSC)

COLS (SECAM)

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

4. SELECTING THE ADJUSTING ITEMS

1)Every pressing of CHANNEL sbutton in the service mode changes the adjustment items in the order of table-2.

(tbutton for reverse order)

5. ADJUSTING THE DATA

1) 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.

6. EXIT FROM SERVICE MODE

1) Pressing POWER button to turn off the TV once.

■INITIALIZATION OF MEMORY DATA OF QA02

After replacing QA02, the following initialization is required.

1. Enter the service mode, then select any register item.

2. Press and hold the CALL button on the Remote, then press the CHANNEL sbutton on the TV. The initialization of QA02 has

been complated.

3. Check the picture carefully. If necessary, adjust any adjustment item above.

Perform “Auto tune” on the owner’s manual.

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

7. TEST SIGNAL SELECTION

1) Every pressing of abutton on the Remote Control changes the built-in test patterns on screen as described below

in SERVICE MODE.

Signals Picture

• All White

Signal off ALL White

8. 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.

Firmware:

Version information of microprocessor

In case of file name : WL48_ASIA and Version : 1.00 indicates[WL48_ASIA_100].

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

Power : Operation number of protecting circuit ----"00" is normal.

When indication is other than "00", overcurrent apt to flow, and circuit parts may

possibly be damaged.

BusCont : --- "OK" is normal.

When type name of semiconductor indicates.

BLOCK

UV : TV reception mode

C1)

V1 : VIDEO 1 input mode (

C2)

V2 : VIDEO 2 input mode (

V3 : VIDEO 3 input mode (

V4 : VIDEO 4 input mode (

V5 : VIDEO 5 input mode (

Model name (7 digit)

37WL48A

WL48_ASIA_000

DESIGN MODE

1. ENTERING DESIGN MODE

S D Press

(Design mode)

Press

2) While pressing CALL button on Remote

and press MENU button on TV.

1) Select the Service mode.

When QA02 is initialized, item “OPT3" of DESIGN MODE is set to the data of the representative model of this chassis family.

Therefore, because ON-SCREEN specification remains in the state of the representative of model. This model is required to

reset the data of item “OPT3".

2. SELECTING THE ADJUSTING ITEMS

Every pressing of CHANNEL tbutton in the design mode changes the adjustment items in the order of table-3.

(sbutton for reverse order)

Version information of

microprocessor

Main tuner information

Sub tuner information

Selectable picture information

Position information

Signal information

Screen size information

Sound system information

Scan mode information

rt yu io

3) The following displays

are shown on the screen

WL48_ASIA_039

45 67 89

WL48_ASIA_039

3. ADJUSTING THE DATA

Pressing of VOLUME sor tbutton will change the value of data.

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