Toshiba 26WL46B Bedienungsanleitung

SERVICE MANUAL

LCD Colour TV

26WL46B

26WL46G

F4LW Chassis

FILE NO. 070-200404

May. 2004 (YC/X)

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PC BOARDS BOTTOM VIEW............................................................................................................................................ 67

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

APPENDIX:

SCHEMATIC DIAGRAM

TABLE OF CONTENTS

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

HANDLING

SERVICE MODE

THE LCD MODULE .........................................................................................................................................

.................................................................................................................................................................

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

LAYOUT OF MAJOR BOARDS........................................................................................................................................... 15

MECHANICAL DISASSEMBLY.......................................................................................................................................... 16

EXPLODED VIEW ............................................................................................................................................................. 35

PACKING DISASSEMBLY ................................................................................................................................................. 39

CHASSIS AND CABINET REPLACEMENT PARTS LIST ................................................................................................. 41

PC BOARDS TOP & BOTTOM VIEW S ............................................................................................................................ 53

CIRCUIT BLOCK DIAGRAM

WIRING CONNECTIONS .................................................................................................................................................. 29

– 2 –

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ENERAL 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

UNPLUG

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.

– 3 –

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ENERAL 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

– 4 –

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ENERAL 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.

– 5 –

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ENERAL ADJUSTMENTS

IC 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.

leaning

emove the power plug before cleaning.

Do not use solvents such as benzine or thinner to clean the TV.

– These solvents may distort the cabinet or damage its finish.

– If rubber or vinyl products remain in contact with the TV for a long time, a stain may result.

When the cabinet becomes dirty, clean it with a soft, dry cloth.

When the cabinet is very dirty.

– Use a damp cloth to wipe the cabinet clean.

– Finish with a dry cloth.

When cleaning the surface of the LCD display:

– Wipe the panel surface gently with a soft, dry cloth.

hen dust has collected on the power plug connectors, remove the plug from the outlet and clean off the

dust.

This dust may cause a fire due to reduced insulation on the plug.

– 6 –

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1. ENTERING TO SERVICE MODE

(1) Procedures

1) Press MUTE key of remote hand unit to indicate MUTE

on screen.

2) Press again MUTE key of remote hand unit to keep

pressing until the next procedure.

(OSD display disappears.)

3) In the status of above (2), press MENU key on TV set.

(2) During service mode, indication S is displayed at upper right

corner on screen.

(3) Service mode is not memorized as the last-memory.

2. TEST SIGNAL SELECTION

The function of VIDEO test signal selection is cyclically

changed with VIDEO key (remote unit) in Service mode.

3. SERVICE ADJUSTMENT

(1) ADJUSTMENT MENU INDICATION ON/OFF :

MENU key(on TV set)

(2) During display of adjustment menu,the followings are

effective.

1) Selection of adjustment item :

POS UP/DN key (on TV/Remote unit)

2) Adjustment of each item :

VOL UP/DN key (on TV/Remote unit)

3) Direct selection of adjustment item

R CUTOFF : 1 POS (Remote unit)

G CUTOFF : 2 POS (Remote unit)

B CUTOFF : 3 POS (Remote unit)

4) Data setting for PC unit adjustment

SUB CONTRAST : 4 POS (Remote unit)

SUB COLOR : 5 POS (Remote unit)

SUB TINT : 6 POS (Remote unit)

5) Screen adjustment mode ON/OFF: Previous

6) Test signal selection: VIDEO (Remote unit)

* In service mode, serviceable items are limited.

(3) Self check display : 9 POS (Remote unit)

* Cyclic display

(4) Initialization of memory (QA02 E2PROM) :

CALL (Remote unit)+POS UP(TV)

Causion : All data of memory IC (including factory setting

value) is initialized by this operation.

(Replacement of memory IC is required.)

(5) Initialization of self check data :

CALL (Remote unit)+POS DN(TV)

(6) BUS OFF :

CALL (Remote unit)+VOL UP(TV)

Test signal

No.

Name of pattern

Signal OFF

NTSC All Red signal

NTSC All Green signal

NTSC All Blue signal

NTSC Cross hatch

NTSC All white signal

PAL All Red signal

PAL All Green signal

PAL All Blue signal

PAL Cross hatch

PAL All white signal

Signal OFF

Table 1

SERVICE MODE

– 7 –

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TROUBLESHOOTING DIAGNOSIS FUNCTION

DIAGNOSIS FUNCTION FOR LED INDICATION

High : Lighting Low : No Lighting

CAUSE

Short-circuit detection of BUS line

BUS line may possibly be short-circuit (SDA to SCL), or BUS line (SDA, SCL)

is grounded.

Overcurrent limiter detection

POWER terminal on TV microprocessor becomes LOW at 2 seconds or more.

Interruption of FAN motor function detection

No. 53 terminal on TV microprocessor becomes HIGH for 30 seconds.

Abnormal sound detection

P4 terminal of QS10 becomes LOW for 15 seconds during Speaker is acti-

vated.

LED

LED is lit in 1 second at in-

tervals of 1 second.

LED is lit in 0.5 at intervals

of 0.5 second.

LED is lit in 0.25 second at

intervals of 2 second.

LED is lit in 5 seconds at in-

tervals of 5 seconds.

4. FAILURE DIAGNOSIS PROCEDURE

This model is equipped with self diagnosis function inside for trouble shooting.

4-1.Contents to be Confirmed by Customer

Contents of self diagnosis

Set Power does not turn on by power-key, or it turns off

automatically.

1.When power protection circuit operates;

2.When FAN STOP was detected:

3.When failure of Audio circuit was detected:

Display items and actual operation

Power indicator lamp blinks and picture does not come.

1.Power indicator red lamp blinks. (0.5 seconds interval)

2.Power indicator red lamp blinks. (3 seconds interval)

3.Power indicator red lamp blinks. (5 seconds interval)

If these indications appear, repairing work is required.

Table 2

– 8 –

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4-2. Contents to be Confirmed in Service Work (Check in Self Diagnosis Mode)

4-3. Executing Self Diagnosis Function

Procedures

(1) Set to service mode.

(2) Pressing “9” key on remote unit displays self diagnosis result on screen.

Every pressing changes mode as below.

SERVICE mode SELF DIAGNOSIS mode M2 System version info Version check(QA01,QM24 etc)

(3) To exit from service mode, turn power off.

Contents of self diagnosis

B. Indication of part code of microprocessor.(QA01)

C. Total Time of Power on (hour)

D. Number of operation of power protection circuit

E. Check of communication status in BUS line

F. Check of signal line by sync signal detection

Display items and actual operation

* Please see item.4-4

Table 3

Description for Version Check Screen

QA01 ****

Version information for MainMicom(QA01)

QA02 **

Version information for E2PROM(QA02)

QF14 ****-**

Version information for M2 Sub-Micom(QF14)

QM24 **

Version information for BEP Sub-Micom(QM24)

QM17 **

Version information for BEP E2PROM(QM17)

– 9 –

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4-4. Self Diagnosis Function Indication & Contents

SELF CHECK

23000XXX B

TIME C

POWER : 000 D

BusCont : OK E

Block : UV V1 V2 V3 V4 F

Fig. 1

Item

B) Part code

C) TIME

D) POWER

E) BUS CONT

F) BLOCK

Contents

Indication of part code of microprocessor.

(QA01)

Total Time of Power on (hour)

Number of operation of power protection circuit

Communication state of bus line

The sync signal part in each video signal supplied

from each block is detected.

Then by checking the existence or non of sync part, the

result of self diagnosis is displayed on screen.

Besides, when “9” key on remote unit is pressed,

diagnosis operation is first executed once.

Instruction of results

Indication of“OK”for normal result

Indication of failure place in abnormality

(Failure place to be indicated)

QA02 NG, H001 NG, Q501 NG,

QV01 NG, Q4420 NG

H002 NG

QA02 : E2PROM, H001 : MAIN TUNER,

Q501 : MCD QV01: AVSW,

Q4420 : SCAN PROCESSOR

H002 : ITT,DSP,APRO

Note 1. The indication of failure place is only one

place though failure places are plural. When

repair of a failure place finishes, the next

failure place is indicated.

*Indication by color

Select Source

: Sync exists = Green

: No Sync = Red

Other Source

: Black

Table 4

– 10 –

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