Toshiba 42WL58A Schematic

FILE NO. 060-200513GR

SERVICE MANUAL

LCD Color Television

42WL58A

42WL58E

42WL58R

42WL58T

The above models are classified as green products (*1), as indicated by the underlined serial numbers. This Service Manual describes replacement parts for the green products. When repairing these green products, use the parts described in this manual and lead-free solder (*2).

For (*1) and (*2), see the next page.

TOSHIBA CORPORATION, 2005

Published in Japan, Nov. 2005 (YC)

SERVICE INSTRUCTIONS ................................................................................................................................................. 3

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

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

LOCATION OF CONTROLS ............................................................................................................................................... 12

LAYOUT OF MAJOR BOARDS .......................................................................................................................................... 15

MECHANICAL DISASSEMBLY .......................................................................................................................................... 16

EXPLODED VIEW .............................................................................................................................................................. 18

PACKING DISASSEMBLY ................................................................................................................................................. 20

CHASSIS AND CABINET REPLACEMENT PARTS LIST ................................................................................................. 21

PC BOARDS TOP & BOTTOM VIEW ................................................................................................................................ 31

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

SPECIFICATIONS ............................................................................................................................................................. 51

APPENDIX:

SCHEMATIC DIAGRAM

(*1) GREEN PRODUCT PROCUREMENT

The EC is actively promoting the WEEE & RoHS Directives that define standards for recycling and reuse of Waste Electrical and Electronic Equipment and for the Restriction of the use of certain Hazardous Substances. From July 1, 2006, the RoHS Directive will prohibit any marketing of new products containing the restricted substances.

Increasing attention is given to issues related to the global environmental. Toshiba Corporation recognizes environmental protection as a key management tasks, and is doing its utmost to enhance and improve the quality and scope of its environmental activities. In line with this, Toshiba proactively promotes Green Procurement, and seeks to purchase and use products, parts and materials that have low environmental impacts.

Green procurement of parts is not only confined to manufacture. The same green parts used in manufacture must also be used as replacement parts.

(*2) LEAD-FREE SOLDER

This product is manufactured using lead-free solder as a part of a movement within the consumer products industry at large to be environmentally responsible. Lead-free solder must be used in the servicing and repair of this product.

WARNING

This product is manufactured using lead free solder.

DO NOT USE LEAD BASED SOLDER TO REPAIR THIS PRODUCT !

The melting temperature of lead-free solder is higher than that of leaded solder by 86°F to 104°F (30°C to 40°C). Use of a soldering iron designed for lead-based solders to repair product made with lead-free solder may result in damage to the component and or PCB being soldered. Great care should be made to ensure high-quality soldering when servicing this product  especially when soldering large components, through-hole pins, and on PCBs  as the level of heat required to melt lead-free solder is high.

SAFETY INSTRUCTIONS

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “SAFETY PRECAUTION” AND “PRODUCT SAFETY

NOTICE” INSTRUCTIONS BELOW.

SAFETY PRECAUTION

WARNING: SERVICE SHOULD NOT BE ATTEMPTED BY ANYONE UNFAMILIAR WITH THE NECESSARY PRECAUTIONS ON THIS RECEIVER. THE FOLLOWING ARE THE NECESSARY PRECAUTIONS TO BE OBSERVED BEFORE SERVICING THIS CHASSIS.

1. An isolation transformer should be connected in the power line between the receiver and the AC line before any service is performed on the receiver.

2. When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in place, such as; nonmetallic control knobs, insulating covers, shields, isolation resistor-capacitor network etc.

3. Always advise users to keep children away. There is danger of injury to children from tools, disassembled products, etc.

4. 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.

5. 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.

6. 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 mark is included in a circuit diagram or parts list.

7. 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.

8. 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.

9. Never remodel the product in any way. Remodeling can result in improper operation, malfunction, or electrical leakage and flame, which may be hazardous.

10. Touch current check (After completing the work, measure touch current to prevent an electric shock.)

• Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.

• Connect a measuring network for touch currents between each exposed metallic part on the set and a good

earth ground such as a water pipe, as shown in Figure D.1.

• The potential at any point (TOUCH CURRENT) expressed as voltage U1 and U2 does not exceed the follow-

ing value:

The part or contact of a TERMINAL is not HAZARDOUS LIVE if:

a) the open-circuit voltage does not exceed 35 V (peak) a.c. or 60 V d.c., or, if a) is not met,

b) the measurement of the TOUCH-CURRENT shall be carried out in accordance with IEC 60990, with the

measuring network described in annex D of this standard.

The TOUCH CURRENT expressed as voltages U

−−

− for a.c.: U

−−

− for d.c.: U

−−

NOTE - The limit values of mA d.c. The limit value

= 35 V (peak) and U2 = 0,35 V (peak);

= 1,0 V,

= 0,35 V (peak) for a.c. and

= 35 V (peak) for corresponds to the value 70 mA (peak) a.c. for frequencies greater than 100 kHz.

and U2, does not exceed the following values:

=1,0 V for d.c. correspond to the values 0,7 mA (peak) a.c. and 2,0

Test TERMINALS

Annex D

(normative)

Measuring network for TOUCH CURRENTS

1500 Ω

500 Ω

0.22 µF

10 kΩ

1 U2 (V)

0.022 µF

IEC 802/96

Resistance values in ohms (

ΩΩ

Ω)

ΩΩ

V: Voltmeter or oscilloscope

(r.m.s. or peak reading)

Input resistance:

Input capacitance:

1 M

< =

ΩΩ

Ω

ΩΩ

200 pF

Frequency range: 15 Hz to 1 MHz and d.c. respectively

−−

NOTE

The measuring instrument is calibrated by comparing the frequency factor of IEC 60990 at various frequencies. A calibration curve is constructed showing the deviation of

Appropriate measures should be taken to obtain the correct value in case of non-sinusoidal waveforms.

−

−−

with the solid line in figure F.2 of

from the ideal

curve as a function of frequency.

TOUCH CURRENT =

/500 (peak value).

Fig. D.1

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These characteristics are often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this manual and its supplements; electrical components having such features are identified by the international hazard symbols on the schematic diagram and the parts list. Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement parts which do not have the same safety characteristics as specified in the parts list may create shock, fire, or other hazards.

GENERAL ADJUSTMENTSSPECIFIC 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.

– 5 –

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.

– 6 –

1. ENTERING SERVICE MODE

1) Press

button once on 2) Press button again and 3) While pressing the button,

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

SERVICE MODE

or Sound Mute

2. DISPLAYING THE ADJUSTMENT MENU

1) Press MENU button on TV.

Service mode Adjustment mode

Press

ADDR DATA BINARY 0000H 00H 00000000B

Press

3. KEY FUNCTION IN THE SERVICE MODE

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

ADDR DATA BINARY

0000H 00H 00000000B

(Service mode display)

Test signal selection : button (on Remote) Selection of the adjustment items : Channel ▲/▼ (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 : CALL + Channel button onTV(▲) Reset the count of operating protect circuit to "00" : CALL + Channel button on TV (▼) "RCUT" selection : 1 button "GCUT" selection : 2 button "BCUT" selection : 3 button "CNTX" selection : 4 button "COLP" selection : 5 button "UVTT" selection : 6 button Automatic A/D Adjustment(PC, Component)

:7 button

Self diagnostic display ON/OFF : 9 button

Color thickness correction note : Displayed differently as shown below, depending on

the setting of the receiving colorsystem. COLP (PAL) COLC (NTSC) COLS (SECAM)

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

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

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 s button on the TV.The initialization of EEPROM IC

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 EEPROM IC 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.

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.

Self check

Firmware : WL58_ASIA_0100

Time : 000000

Bus line : OK

Bus cont : CXA2189Q(90H)

Block : UV V1 V2 V3 V4 V5

V6 PC

12345678 42WL58A

1 Firmware :

Version information of microprocessor

In case of file name : WL58_ASIA and Version : 0100 indicates[WL58_ASIA_0100].

2 Time : Total hour of turn the TV on. (Unit : H) 3 Bus line : --"OK" is normal

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

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

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

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

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

5 Block

UV : TV reception mode

V1 : VIDEO 1 input mode ( 1)

V2 : VIDEO 2 input mode ( 2)

V3 : COMPONENT VIDEO 1 input mode ( C1)

V4 : COMPONENT VIDEO 2 input mode ( C2)

V5 : HDMI 1 input mode

V6 : HDMI 2 input mode

PC : Personal Computer input mode

Green indication : SYNC mode

Red indication : No SYNC mode

Black indication : No Select mode

6 8 digit : CD number 7 Model name (7 digit)

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.

Version check

MAIN MPU : WL58_ASIA_0100(E16)

EEPROM : 01

SUB MPU : 2E

OPTION : 00 11 22 33 44 55

HDMI ID : 11223344

12345678 42WL58A LPL-42

1 MAIN MPU :

Version information of microprocessor

In case of file name : WL58_ASIA, Version 0100 for Code Program Version

and (E16) for OSD Version indicates [WL58_ASIA_0100(E16)]

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 CD number : Display 8 digit number 7 Model name : Display 7 digit number 8 Panel Vender information display

The following Panel Vender and screen size are displayed.

Panel Panel Vender Screen Size(Inch)

LCD LPL -23

SHP -26

CMO -32

-37

-42

PDP LG -42

Example : LPL-42 indicates that Vender is LPL and Screen Size is 42 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.

Status check

MAIN : EXT1

MAIN FORMAT : 1080i-50

MAIN PLL : C6 38 54 CE 08

SUB : EXT1

SUB FORMAT : 1080i-50

SUB PLL : C6 38 54 CE 08

SCREEN SIZE : Super live

OTHER STATUS : 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 SUB :

Sub source information :

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

5 SUB FORMAT :

Display Video and PC format information

6 SUB PLL :

Sub PLL information : Display five numbers of 1 byte data.

7 SCREEN SIZE :

Display the screen size as follows.

Super live

Cinema

Subtitle

14:9

Wide

4:3

8 OTHER STATUS :

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

TV TOP, TV FRONT

LOCATION OF CONTROLS

You can swivel the TV screen. Swivel angle: 15 degrees to

Input source selection

left and right.

Volume – + Menu

To use the BRIDGE MEDIA

TV top view

Program position Menu

Top view

Power

TV front view

/ Power switch

Remote sensor Power indicator

(red)

On-timer indicator (green)

Slot for SD or Memory Stick

SD Memory Card

Memory Stick card

SmartMedia card

TV left side view

Slot for SmartMedia

TV BACK

Left side view

(1) Video 1

input terminals

(C1) COMPONENT VIDEO INPUT

terminals

(C2) COMPONENT VIDEO INPUT

terminals

WOOFER

OUT terminal

AUDIO

OUT terminals

(Fixed/Variable)

Right side view

MONITOR

OUT terminals

TV back view

Antenna input

Right side

view

Video 2 input terminals

Headphone jack

(3.5 mm, stereo)

(2)

Cable holder

Back view

RGB/PC

(AUDIO) input

Card into the slot

Squeeze tab and pull h to open the door.

RGB/PC

Power cord

HDMI 1 AUDIO

input terminals

input

HDMI 1

HDMI 2 AUDIO

input terminals

HDMI 2

input termi

input terminal

Headphones

(Not supplied)

REMOTE CONTROL

Teletext on/off

CALL

Initial/index function for Teletext

To return to the previous program

Picture mode selection

DVD MENU

• Menu

• Volume – +

Stereo/bilingual selection

CALL

21 3

54 6

87 9

MENU EXIT

DVD

Power on/Standby (For Toshiba TV/VCR/DVD)

Number buttons (0-9)

• Input source selection 2,

C1,

(

C2,

HDMI 1, HDMI 2, PC, BM)

• To access sub-pages when in

teletext

Picture size selection

EXIT

• Menu

• Program position

• Teletext

• P

• Teletext control buttons (Four colored buttons: Red, Green, Yellow, Blue)

• BRIDGE MEDIA

Mode switch TV : To control TV VCR : To control VCR DVD : To control DVD

When in VCR or DVD mode: (Only for Toshiba VCR/DVD players)

to EJECT to REWIND to PLAY to FAST FORWARD to PAUSE to SKIP-REWIND to STOP to SKIP-FORWARD

VCR DVD

DVD

CT-90241

• Bass boost on/off

• External woofer on/off

Sound mute

When in Teletext mode:

To reveal concealed text

To hold a wanted page

To enlarge teletext display size

y/X

To select a page while viewing a normal picture

When in TV mode:

y/X

To select the time display Double-Window on/off Picture STILL

n Double-Window

sound selection

picture/

+ 30 hidden pages

Toshiba 42WL58A Schematic

TABLE OF CONTENTS

HANDLING THE LCD MODULE

SERVICE MODE

LOCATION OF CONTROLS