Toshiba 26HL84 Bedienungsanleitung

SERVICE MANUAL

LCD Color Television

26HL84

FILE NO. 020-200405

Jun. 2004 (YC/X)

– 2 –

TABLE OF CONTENTS

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

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

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

TROUBLESHOOTING DIAGNOSIS FUNCTION ................................................................................................................ 8

LOCATION OF CONTROLS .............................................................................................................................................. 10

LAYOUT OF MAJOR BOARDS ......................................................................................................................................... 12

MECHANICAL DISASSEMBLY ......................................................................................................................................... 13

EXPLODED VIEW ............................................................................................................................................................. 26

PACKING DISASSEMBLY................................................................................................................................................. 30

CHASSIS AND CABINET REPLACEMENT PARTS LIST ................................................................................................. 31

PC BOARDS BOTTOM VIEW ........................................................................................................................................... 39

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

APPENDIX:

SCHEMATIC DIAGRAM

CIRCUIT BLOCK DIAGRAM ............................................................................................................................................. 53

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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.

– 4 –

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 Ωor 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

– 5 –

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.

– 6 –

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.

– 7 –

SERVICE MODE

ENTERING TO SERVICE MODE

1) Press the "MUTE" button once on the remote control, "1/2 MUTE" is displayed on the screen.

2) Press the "MUTE" button again, "MUTE" is displayed on the screen.

3) Press the "MENU" button on the TV while pressing the "MUTE" button on the remote control, "S" may appear

on the screen. Then enter to the service mode.

4) Press the "MENU" button on the remote control, adjustment item appears on the screen.

NOTE

Adjustment items may change by pressing the "CH " buttons on the remote control.

1) 2) 3) 4)

* EXIT FROM SERVICE MODE-Turn off the "POWER" of the TV or remote control.

Built-in signal

.When press the "INPUT" source selection button on the remote controller during service mode,

generate the built-in test video signal for servicing.

Built-in test video signal (Use for the adjustment such as white balance, etc.)

General broadcasting signal => red monochrome => green monochrome

=> blue monochrome => white signal => black cross bar => built-in signal OFF

CAUTION

For the video system adjustment, never attempt to initialize the data unless initial setting data is exceed

incorrectly.

Adjustment items

Brightness correction

(BRTC)

White balance

(RCUT) (GCUT) (BCUT)

Adjustment procedure

1) Receive a general broadcasting program, then press "MENU" button on the

remote control, set the unicolor to minimum (00) and brightness to standard (00)

in order to display the "Setting menu" => "Picture setting" => "Picture adjust-

ment" by pressing the cursor buttons " ".

2) Select BRTC (brightness correction) using the cursor buttons "CH " on the

remote control, fine adjust the black signal to be black using the "VOL "

buttons on the remote control. After the adjustment, set "unicolor" back to

initialize data.

1) Enter the service mode, press the "INPUT" source setting button on the remote

control to generate the built-in white signal.

2) Adjust the data of items RCUT, GCUT and BCUT for proper white-balanced

picture in low light area.

* For high light area, GDRV and RDRV items can be adjusted for proper white-balanced picture.

1/2 mute mute

SRCUT

60H

(Service mode screen)

– 8 –

TROUBLESHOOTING DIAGNOSIS FUNCTION

1. 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

activated.

LED

LED is lit in 1 second at

intervals 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

intervals of 5 seconds.

– 9 –

2. SELF DIAGNOSIS FUNCTION

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

2) During diagnosis, the following displays are shown.

Part number of microprocessor

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

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

aged.

BUS LINE ------"OK" is normal.

When indication shows "NG (Green: OK, Red: NG)", the BUS line may possibly be short-circuit.

BUS CONT------"OK" is normal.

When indication shows "Q uuu (Green: OK, Red: NG )", the device with the number may possibly be

damaged.

BLOCK

MAIN : Main picture display --Green indication

Main picture does not display--Red indication

SUB : Sub picture display --Green indication

Sub picture does not display--Red indication

ID number of this unit.

EEP of soft version information

Data number of OPT1 and OPT2

Software version information of host microprocessor (date indication)

DVI NO : DVI number information

DVI ERR CODE : DVI status code number

BEP SW VER : Software version information for BEP microprocessor

BEP E2P VER : Software version information for BEP E2P

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

*INITIALIZATION OF SELF DIAGNOSIS DATA

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

2) Press and hold the RECALL button on the remote control, then press the CHANNEL up button on the TV. The

initialization has been completed.

GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

– 10 –

LOCATION OF CONTROLS

POWER

Top

FrontSide

Terminals

(VIDEO 3)

POWER

Remote sensor

Power indicator

Back

Remove

the covers

Antenna terminals

DVI/HDCP IN

Terminals

• VIDEO/AUDIO OUT

• VARIABLE AUDIO OUT

Headphone jack

Control panel

Swivel base

Cable clamper

(Supplied: see page 8)

Terminals

• VIDEO 1 IN

• VIDEO 2 IN

• ColorStream HD-1/2

• TheaterLink IN/OUT

Push

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