Toshiba 23HLV85 - 23" LCD TV Bedienungsanleitung

SERVICE MANUAL

LCD Color Television

23HLV85

FILE NO. 050-200532

Published in Japan, Sep. 2005 (YC)

TOSHIBA CORPORATION 2005

DOCUMENT CREATED IN JAPAN, Sept., 2005

TABLE OF CONTENTS

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

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

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

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

2. ADJUSTMENT ....................................................................................................................................................................... 8

2-1. ADJUSTMENT TOOLS AND CONDITIONS ...................................................................................................................8

2-2. AUTO GAIN/OFFSET ADJUSTMENT .............................................................................................................................8

2-3. DDC EDID DATA READ & WRITE ...................................................................................................................................9

3. VCTI FIRMWARE INSTALLATIONS/UPGRADING ............................................................................................................. 19

3-1. VCTI FIRMWARE INSTALLATIONS ............................................................................................................................. 20

3-2. SCALER FIRMWARE INSTALLATIONS ....................................................................................................................... 26

4. TROUBLESHOOTING ......................................................................................................................................................... 33

5. EXPLODED VIEW ............................................................................................................................................................... 40

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

7. PC BOARDS TOP & BOTTOM VIEW .................................................................................................................................. 52

8. SCHEMATIC DIAGRAM ...................................................................................................................................................... 55

8-1. WIRING DIAGRAM ....................................................................................................................................................... 56

8-2. BLOCK DIAGRAM ........................................................................................................................................................ 57

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.

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

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, 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.

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 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.

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 [ ] on LCD TV.

Service mode displayed on TV screen

VCTi version

Items other than those enclosed by are default

settings.

Item Default setting

3D Comb Filter 1

HDTV 1

PC Information 1

Speaker Outout 0

FLI2310 1

Country 2

Canadian Vchip 0

BS 0

Module Option 0

Scaler version

2.Adjustment

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

2-1.Adjustment Tools and Conditions

Tools: Pattern Generator (801GF, MSPG925F)

DDC Adjustment Tool

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.

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:

XGA (1024x768) 16-step or 11-step grayscale

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

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

(Adjustment in component mode or PC mode)

No Power

(LED indicator off)

Check P51 Connector

No Power

(LED indicator off)

Change IC1000, IC1001

Change IC1105, IC1104 or

IC1106, IC1103

Check 15V or ST_5V

of Power B/D

Check Output of

IC1105, IC1104 or

IC1106,IC1103

Fail

Check LED Assy

Check Output of

IC1000, IC1001 Fail

Pass

Process A

Change LED Assy

Fail

Ref.1/1-1

ST_5V : P1000, #1Ref.115V : P1000, #14, 15Ref.1-1

4.TROUBLESHOOTING

No Raster on Component

signal

Check input source cable

and jack

Re-soldering or Change

the defect part Check

IC400

Repeat Process A

Fail

Check the signal of

R178, R179, R180

Check the input/ output

of IC400

Check the input/ output

of IC501

Fail

Pass

Re-soldering or Change

the defect part Check

IC501,X500, IC701

Change R178, R179, R180

Re-soldering or Change

the defect part Check

IC450,X450,IC451

Check the input/ output

of IC450 Fail

Fail

Pass

Ref.2/2-1

Component V signal Output :

IC400, #64

Ref.2Component H signal Output :

IC400, #66

Ref.2-1

Process C

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