Toshiba 27HL95 Service Manual

FILE NO. 020-200513

DOCUMENT CREATED IN JAPAN, July, 2005

SERVICE MANUAL

LCD Color Television

27HL95

TOSHIBA CORPORATION 2005

Published in Japan, Jul. 2005 (YC)

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

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

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

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

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

EXPLODED VIEW .............................................................................................................................................................. 15

PACKING DISASSEMBLY ................................................................................................................................................. 17

CHASSIS AND CABINET REPLACEMENT PARTS LIST ................................................................................................. 18

PC BOARDS TOP & BOTTOM VIEW ................................................................................................................................ 24

CIRCUIT BLOCK DIAGRAM .............................................................................................................................................. 49

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

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

Examples of marks

SHOCK HAZARD

PROHIBIT DISASSEM-

BLING

UNPULUG

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.

The" indicates caution (including danger and warning). The actual meaning of this caution is indicated inside the The example shown to the left indicates the danger of "electrical shock".

indicates a forbidden action.

The The actual meaning of this caution is indicated inside the 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 The example shown to the left indicates that the power plug must be disconnected.

or nearby illustrations or text.

KEEP CHILDREN

AWAY

UNPULUG

SHOCK HAZARD

USE SPECIFIED

PARTS

CAUTION FOR

WIRING

CAUTION FOR

ASSEMBLING /

WIRING

WARNING

• 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 possible 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 characteristics. Use only the specified parts when the

• 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 reconnect 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.

mark is included in a circuit diagram or parts list.

CHECK INSULATION

RESISTANCE

PROHIBIT

REMODELING

• 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 1 or 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 water. 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 precautions when handling the module.

1. When attaching the LCD module to the LCD cover, position it appropriately and fasten at the position where the display can be viewed most conveniently.

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.

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 module because any impact can adversely affect the performance. Also use caution when handling the polarized screen because it can easily be damaged.

The metal edges of the LCD module

CAUTION

are sharp, so use caution to avoid injury.

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 module, 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 conditions 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

1) Press MUTE button twice on 2) Press MUTE button again and 3) While pressing the MUTE button,

Remote Control. keep pressing. press MENU button on TV set.

MUTE

2. DISPLAYING THE ADJUSTMENT MENU

1) Press MENU button on Remote Control.

Service mode Adjustment mode

Press

3. KEY FUNCTION IN THE SERVICE MODE

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

(Service mode display)

Test signal selection : TV/VIDEO button (on Remote)

Selection of the adjustment items : Channel Change of the data value : Volume W / X (on TV) or

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

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

Reset the count of operating protect circuit to “00” :

“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) : 7 button

Self diagnostic display ON/OFF : 9 button

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

CALL + Channel button on TV ( )

/ (on TV or Remote)

-----

Color thickness correction

note: Displayed differently as shown below, depending

on the setting of the receiving color system.

COLP (PAL)

COLC (NTSC)

COLS (SECAM)

/ (on Remote)

4. SELECTING THE ADJUSTING ITEMS

1) Every pressing of CHANNEL button for reverse order)

(

5. ADJUSTING THE DATA

1) Pressing of VOLUME W / X , / 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

After replacing EEPROM IC, 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 EEPROM IC has been completed.

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 EEPROM IC has been replaced.

7. TEST SIGNAL SELECTION

1) Every pressing of TV/VIDEO button on the Remote Control changes the built-in test patterns on screen as described below in SERVICE MODE.

button in the service mode changes the adjustment items in the order of table-2.

button on the TV. The initialization of

All BlackAll White

BSignal off G

Signals Picture

• Red raster

• Green raster

• Blue raster

• All Black

• 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.

HL95_1489

000000

000

1 Firmware :

Version information of microprocessor

In case of file name : HL95 and Version : 1489 indicates[HL95_1489].

2 Time : Total hour of turn the TV on. (Unit : H) 3 Power : Operation number of protecting circuit ----"000" is normal.

When indication is other than "000", overcurrent apt to flow, and circuit parts may possibly be damaged.

4 Bus line : --"OK" is normal

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

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

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

5 Bus cont : --- "OK" is normal.

NG is abnormal(Red indication).

When type name of semiconductor indicates.

6 Block

UV : TV reception mode

V1 : VIDEO 1 input mode

V2 : VIDEO 2 input mode

V3 : ColorStream HD

V4 : HDMI IN

PC : Personal Computer (PC)

9. VERSION CHECK MODE

1) Press “9” button twice on Remote Control during display of adjustment menu in the service mode. The version of main

MPU will begin to check.

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

1 2

3 4

HL95_1489 (U15) FF

74 00 01 25 00 00

00000155

SHP-27

1 MAIN MPU :

Version information of microprocessor

In case of file name : HL95, Version 1489 for Code Program Version

and (U15) for OSD Version indicates [HL95_1489(U15)]

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 LCD Panel Vender information display

The following Panel Vender and screen size are displayed.

Panel Vender Screen Size(Inch)

CMO -27

SHP -32

Example : SHP-32 indicates that vender is SHP and Screen Size is 32 inch.

10. 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 begin to check.

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

1 2 3

EXT1

480i

C6 08 10 CE 05

NATURAL

0000 0000 0000

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 five numbers of 1 byte data.

4 SCREEN SIZE :

Display the screen size as follows.

Theater Wide 1

Theater Wide 2

Theater Wide 3

FULL

NATURAL

5 OTHER STATUS :

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

LAYOUT OF MAJOR BOARDS

U102A

RF-SW TIF BOARD

U101B

LED BOARD

U101A

AV TERMINAL BOARD

U103A

SIGNAL BOARD

U811

POWER BOARD

U101C

KEY BOARD

U101D

PC-IN BOARD

U105A

D-TUNER BOARD

U812

AC-IN BOARD

U104A

SEINE FOR FPD BOARD

+ 28 hidden pages

Toshiba 27HL95 Service Manual

TABLE OF CONTENTS

SERVICE SAFETY PRECAUTIONS

HANDLING THE LCD MODULE

SERVICE MODE

LAYOUT OF MAJOR BOARDS