TOSHIBA 42WP46P Service Manual

FILE NO. 030-200418

SERVICE MANUAL

Plasma Color Television

42WP46P

Published in Japan, Oct. 2004 (YC)

TABLE OF CONTENTS

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

IMPORTANT INFORMATION ............................................................................................................................................... 5

CLEANING ........................................................................................................................................................................... 6

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

DESIGN MODE ....................................................................................................................................................................10

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

LAYOUT OF MAJOR BOARDS ............................................................................................................................................ 13

MECHANICAL DISASSEMBLY.......................................................................................................................................... 14

EXPLODED VIEW ............................................................................................................................................................. 17

PACKING DISASSEMBLY.................................................................................................................................................. 18

CHASSIS AND CABINET REPLACEMENT PARTS LIST ................................................................................................. 20

PC BOARDS TOP & BOTTOM VIEW ............................................................................... ................................................ 28

BLOCK DIAGRAM ............................................................................................................................................................. 42

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

APPENDIX:

SCHEMATIC DIAGRAM

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2

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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

* 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

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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.

or nearby illustrations or text.

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or nearby illustrations or text.

GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

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KEEP CHILDREN

AWAY

GENERAL ADJUSTMENTS

UNPULUG

SHOCK HAZARD

USE SPECIFIED

PARTS

SPECIFIC INFORMATIONS

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

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IMPORTANT INFORMATION

About Permanent after-image

• Due to the characteristics of a plasma screen, if the same image is displayed for an extended period
of time, permanent after-image (image retention) in part of the screen may result. As a result of accu­mulative effect, brightness deterioration results.
To prevent permanent after-image, it is recommended not to display the same image for an extended

After-image appear

Note on operations in 4:3 mode

• In 4:3 mode, because of the sharp contrast between the displayed image area and non-displayed image area (frame),
permanent after-image is likely to result.
Therefore, we recommend adjusting the TV settings as follows:

1.Reduce “Contrast” and “Brightness” of the picture. The more you reduce, the more effect is effective.

2. Adjust the brightness of the side panels. The more you turn the brightness high, the more effect is effective.
However, after adjusting the above settings, permanent after-image may not be removed entirely; only the onset of after­image is delayed. Display your TV in Super Live or Wide mode as much as possible.

Some parts of the screen do not light up

• The plasma display panel is manufactured using an extremely high level of precision technology, however sometimes
some parts of the screen may be missing picture elements or have luminous spots. This is not a sign of a malfunction.

About infrared rays

• The plasma screen of this unit emits infrared rays in normal operation, and may influence some infrared-operated equip­ment by a use state although the measures of infrared ray (filter, etc.) are taken. Locate such equipment carefully to
prevent rays from the plasma screen causing any problems.

period of time, or in 4:3 mode. If retention occurs, display a moving picture like a video movie. This may
help to reduce minor permanent after-image. But it cannot be removed entirely once it has occurred. If
the same static picture is displayed frequently, it is recommended to decrease “Brightness,” or to
adjust the Long life setting.

GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

About Interference

• Plasma display may cause interference in image, sound, etc. of other electronic equipment that is easy to receive electro­magnetic waves (i.e. AM radios and video equipment) under certain installed condition. In particular, it may affect elec­tronic equipment beyond the residential unit where a plasma display TV is used.

About Static electricity

• If you touch the surface of the screen panel, you may feel a slight electric shock. This is harmless.

About using under the low temperature places

• If you use the TV in the room of 0°C or less, the picture brightness may vary until the plasma monitor warms up. This is not
a sign of a malfunction.

About disposal

• Dispose the TV depending on the related local rules or laws.

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CLEANING

Remove 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 plasma display:
– Wipe the panel surface gently with a supplied soft, dry cloth.

When 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.

Clean here

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1. ENTERING TO SERVICE MODE

1) Press o button once on
Remote Control.

SERVICE MODE

2) Press o button again to
keep pressing.

3) While pressing the o button,
press MENU button on TV set.

or Sound Mute

2. DISPLAYING THE ADJUSTMENT MENU

1) Press MENU button on TV.

Service mode

S

Press

Press

Adjustment mode

Item

Data

3. KEY FUNCTION IN THE SERVICE MODE

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

Screen adjustment mode ON/OFF: -/-- button (on Remote)
Test signal selection : a button (on Remote)
Selection of the adjustment items : Channel s/t (on TV or Remote)
Change of the data value : Volume ; +/– (on TV or Remote)
Adjustment menu mode ON/OFF : MENU button (on TV)
Initialization of the memory (QA02) : CALL + Channel button on TV (s)
Reset the count of operating protect

circuit to “00”: CALL + Channel button on TV (t)
“RCUT” selection : 1 button
“GCUT” selection : 2 button
“BCUT” selection : 3 button
“SCNT” selection : 4 button
“COLP” selection : 5 button
“TNTC” selection : 6 button
Convergence adj : YELLOW button
Self diagnostic display ON/OFF : 9 button

Color thickness correction
note: Displayed differently as shown below, de-

pending on the setting of the receiving color
system.
COLP (PAL)
COLC (NTSC)
COLS (SECAM)

Item

Data

(Service mode display)

S

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

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4. SELECTING THE ADJUSTING ITEMS

1)Every pressing of CHANNEL s button in the service mode changes the adjustment items in the order of table-2.
(t button for reverse order)

5. ADJUSTING THE DATA

1) Pressing of VOLUME ; +/– 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 OF QA02

After replacing QA02, 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 s button on the TV. The initialization of QA02 has
been complated.

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 QA02 has been replaced.

7. TEST SIGNAL SELECTION

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

Signal off

ALL White

Signals Picture

• All White

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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 are executed properly.

2) During diagnosis, the following displays are shown.

1

2

3

4

5

6

1

Firmware:

WP48_EURO

42WP46P

Version information of microprocessor
In case of file name : WP48_EURO and Version : 1.00 indicates[WP48_EURO_100].

2

Time: Total hour of turn the TV on. (Unit : H)
Power : Operation number of protecting circuit ----"00" is normal.

3

When indication is other than "00", overcurrent apt to flow, and circuit parts may
possibly be damaged.
BusCont : --- "OK" is normal.

4

When type name of semiconductor indicates.
BLOCK

5

UV : TV reception mode

VIDEO 1 input mode (

V1 :
V2 : VIDEO 2 input mode (
V3 : VIDEO 3 input mode (
V4 : VIDEO 4 input mode (
V5 : VIDEO 5 input mode (

Model name (7 digit)

6

1)

2)

3)

4)

5)

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1. ENTERING TO DESIGN MODE

1) Select the Service mode.

DESIGN MODE

2) While pressing CALL button on Remote
and press MENU button on TV.

3) The following displays
are shown on the screen

S D

(Design mode)

q

1

WP48_EURO

45 67 89

rt yu io

we

23

Press

Press

WP48_EURO

Version information of

q

microprocessor
Main tuner information

w

Sub tuner information

e

Selectable picture information

r

Position information

t

Signal information

y

Screen size information

u

Sound system information

i

Scan mode information

o

When QA02 is initialized, item “OPT3" of DESIGN MODE is set to the data of the representative model of this chassis family.
Therefore, because ON-SCREEN specification remains in the state of the representative of model. This model is required to
reset the data of item “OPT3".

2. SELECTING THE ADJUSTING ITEMS

Every pressing of CHANNEL t button in the design mode changes the adjustment items in the order of table-3.
(s button for reverse order)

3. ADJUSTING THE DATA

Pressing of VOLUME s or t button will change the value of data.

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Power Button

RED – Power On

GREEN – On-timer set

INPUT 5

(EXT 5)

Front

LOCATION OF CONTROLS

Back

TV

IN/OUT

decoder*

VCR

video recorder

SAT

BRACKET HOLES

IN

OUT

IN

OUT

SCART 1

(EXT 1)

SCART 2

(EXT 2)

SCART 3

(EXT 3)

MAINS LEAD

SUPPLIED

COMPONENT CONECTING A COMPUTERVIDEO INPUT (EXT 4)

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Remove the back cover to reveal the battery compartment and make sure the batteries are inserted
the right way round. Suitable battery types for this remote are UM-4, AAA, IEC R03 1.5V.

Do not combine a used, old battery with a new one or mix battery types. Remove dead batteries
immediately to prevent acid from leaking into the battery compartment. Dispose of them in a
designated disposal area.

The performance of the remote control will deteriorate beyond a distance of five metres or outside an
angle of 30 degrees from the centre of the television. If the operating range becomes reduced the
batteries may need replacing.

Inserting batteries and effective range of the remote

Simple at-a-glance reference of your remote control.

To mute the sound

Teletext control buttons

To exit Menus

Bass Boost/Super Woofer

Stereo/Bilingual reception

To bring up on-screen information and

for the teletext initial/index function

To select input from external sources
To access sub-pages when in teletext
mode

To select mode

On-screen Menus

Selectable picture preferences

Widescreen viewing

Number buttons

To return to the previous programme

For On/Standby mode

To display teletext

When using a TOSHIBA VCR or DVD:

press

m

to PAUSE

press

w

to EJECT

press

l

q

to SKIP-REWIND

press

s

l

to SKIP-FORWARD

press

r

to PLAY

press

p

to STOP

press

q

to REWIND

press

s

to FAST FORWARD

To change programme positions and
teletext pages
To alter the volume
When using menus the arrows move the
cursor on the screen up, down, left or
right. OK to confirm your selection

When in TV mode:

8/9

Time display

When in Teletext mode:

r

To reveal concealed text

q

To hold a wanted page

s

To enlarge teletext display size

8/9

To select a page whilst viewing a
normal picture

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