Toshiba 42DPC85 Service Manual

SERVICE MANUAL

DOCUMENT CREATED IN JAPAN, Sept., 2005

Revision 1

Plasma Monitor

42DPC85

FILE NO. 020-200521

TOSHIBA CORPORATION 2005

Published in Japan, Sep. 2005 (YC)

TABLE OF CONTENTS

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

SERVICE MODE .................................................................................................................................................................. 5

LAYOUT OF MAJOR BOARDS .......................................................................................................................................... 10

MECHANICAL DISASSEMBLY .......................................................................................................................................... 11

EXPLODED VIEW .............................................................................................................................................................. 13

PACKING DISASSEMBLY ................................................................................................................................................. 15

CHASSIS AND CABINET REPLACEMENT PARTS LIST ................................................................................................. 16

PC BOARDS TOP & BOTTOM VIEW ................................................................................................................................ 19

CIRCUIT BLOCK DIAGRAM .............................................................................................................................................. 33

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".

The

indicates a forbidden action. 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

SERVICE MODE

Recall

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

Recall

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

000000

DPC85_0100

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.

M Firmware :

Version information of microprocessor

In case of file name : DPC85 and Version : 0100 indicates[DPC85_0100].

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

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

NG is abnormal(Red indication), when type name of semiconductor indicates.

Q Block

V1 : VIDEO 1 input mode

V2 : VIDEO 2 input mode

V3 : VIDEO 3 input mode

V4 : ColorStream 1 IN

V5 : ColorStream 2 IN

V6 : HDMI A/V IN

9. VERSION CHECK MODE

DPC85_0100(U15) 01

24 00 01 57 00 00

00000155

LG−42

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.

M N

O P

MAIN MPU :

Version information of microprocessor

In case of file name : DPC85, Version 0100 for Code Program Version

and (U15) for OSD Version indicates [DPC85_0100(U15)]

N EEPROM :

Version information of EEPROM : Display 1 byte data.

O SUB MPU :

Version information of SUB MPU : Display 1 byte data.

P OPTION :

Option information : Display six numbers of 1 byte data.

Q HDMI ID :

HDMI ID information : Display 4 byte data.

R PDP Panel Vender information display

The following Panel Vender and screen size are displayed.

Panel Vender Screen Size(Inch)

LG -42

Example : LG-42 indicates that vender is LG and Screen Size is 42 inch.

10. STATUS CHECK MODE

EXT1

480i

NATURAL

0000 0000 0000

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.

M N

M MAIN :

Main source information :

Display RF position number (0 - 99) on the main screen, or Input Source (EXT1/2/3/HDMI etc.)

N MAIN FORMAT :

Display Video and PC format information

O SCREEN SIZE :

Display the screen size as follows.

Theater Wide 1

Theater Wide 2

Theater Wide 3

FULL

NATURAL

OTHER STATUS :

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

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