Toshiba 14JL7E User manual

SERVICE MANUAL

LCD Color Television

14JL7E

14JL7H

14JL7R

20JL7E

20JL7H

20JL7R

FILE NO. 060-200442

Oct. 2004 (YC/X)



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

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

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

LOCATION OF CONTROLS .............................................................................................................................................. 10

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

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

EXPLODED VIEW ............................................................................................................................................................. 26

PACKING DISASSEMBLY................................................................................................................................................. 30

CHASSIS AND CABINET REPLACEMENT PARTS LIST ................................................................................................. 32

PC BOARDS BOTTOM VIEW ........................................................................................................................................... 41

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

APPENDIX:

SCHEMATIC DIAGRAM

CIRCUIT BLOCK DIAGRAM ............................................................................................................................................. 54



 

 

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

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







 













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









 

 









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































 



 



 







 







 

 









 









 





�



 





– 4 –

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, so use caution to avoid in-

jury.

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.

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 mod-

ule, use a wrist ground or anchor ground.

– 5 –

 



 







 



 







– 6 –

SERVICE MODE

1. ENTERING SERVICE MODE

NOTE

Switching setting screens CH /CH

Selecting setting screen Volume +/

Resetting service mode TV power OFF

Select an item from the menu screen to see the settable items. Some settings include several sub items.

Switching items CH /CH

Returning to the top menu CALL button on the Remote Controller

2. REMOTE CONTROLLER /TV CONTROLS IN SERVICE MODE

When the TV is in the service mode (step 1),

you can use either the Remote Controller or controls on the TV to register your settings.

1) Press the button on the Remote

Controller to display the MUTE mark

on the screen.

2) Press the button again to delete

the MUTE mark.

3) Hold down the button while

pressing the INPUT button on the

TV while to enter the service mode.

The setting menu will appear.

SERVICE MODE S

1. RGB 2. DEF

3. COMB 4. OTHERS

5. TA1304 6. MSP3410

7. IIC 8. OPTION

9. AFT 10. VOL

11. BLIGHT 12. RESIZE

Switching

selectable items

Self diagnostic

function

B CUTOFF

R CUTOFF

G CUTOFF

Selecting and adjusting settings

REMOTE CONTROL

PICUTURE

BRIGHT

CALL

Selecting and adjusting settings

(Volume

/+)

Input source

selection

Switching settab

Power ON/Stand-by

Switching

items

(Channel up/down)

INPUTINPUT POWER

3. ADJUSTMENTS IN SERVICE MODE

Use Volume

buttons to change settings.

See SETTING & ADJUSTING DATA for details on the

setting data.

3-1. RGB

Switching items using the CH /CH buttons

1 BRIGHT 2 PICTURE 8 R CUTOFF

9 G CUTOFF 10 B CUTOFF 12 G DRIVE

13 B DRIVE

/CH buttons

1 WCTL 2 BASC 3 TREC 4 WON1 5 WON2

6 WOFF 7 EBAS 8 ETRE 9 EVOL

10 BASX 11 TREX 12 TONN 13 ALS

14 W100 15 W70 16 W40 17 V100 18 V75

19 V50 20 V25 21 22VOLX 23 BAS1

24 BAS2 25 TRE1 26 TRE2 27 WFL1

28 WFL2 1 WCTL

3-6. MSP3410

Switching items using the CH /CH buttons

1 V01 2 V25 3 V50 4 V75 5 V100 6 LODN

7 BASX 8 BASC 9 TONN 10 TREX

11 TREC 12 WON2 13 WCTL 14 MDBLP

15 MDBHP 16 MDBHM 17 BAS1 18 TRE1

19 WFL1 20 BAS3 21 TRE3 22 WFL3

23 VOLX 24 VOLS 25 FVOL 26 FVDK

buttons.

3) Holding down the CALL button on the Remote Controller

and the CH button on the TV simultaneously powers

the TV ON and OFF. This [a) initializes] [b) registers] the

data.

CAUTION : Never try to perform initialization unless you

have changed the memory IC.

1 BRIGHT

* The Direct select buttons (0-9) correspond to main the

RGB-related settings. For more information, refer to

"2. REMOTE CONTROL BUTTONS/TV SWITCHES IN

SERVICE MODE".

3-2. DEF

Switching items using the CH /CH buttons

1 V_CENTER 46 HPOS 1 V_CENTER

3-3. COMB

Not used

3-4. OTHERS

Not used

3-5.TA1304

Switching items using the CH

27 NVOL 28 NICL 29 NICH

30 IDL 31 IDH

32 XVOL 1 V01

3-7. IIC (Indicates bus line communication status)

BUS CONT: Displays results on responses from devices

3-9. AFT

/CH buttons

1 V25 2 V50 1 V25

5. INITIALIZING MEMORY IC

1) Enter the service mode.

2) Hold down the CALL button on the Remote Controller

and select "D" (Design Mode) with the CH

3-10.VOL

Switching items using the CH

/CH buttons

2 PWMX 3 PWMN 4 KSTD

3-11. BLIGHT

Switching items using the CH

1 PWMC 5 KMV

6 APLS 7 APLB

9 BLIGHT_CURSOR

8 KAPL

1 PWMC

/CH buttons

2 V_POS_CAP 3 H_POS_CAP 4 SYNC

3-12. RESIZE

Switching items using the CH

1 CALIB

5 K_FACTOR 6 K_FACTOR_DATA 1 CALIB

3-8. OPTION

/CH buttons

1 MTS 2 HOTEL 4 POSITION 5 A PRO

6 FM 7 ON_TIMER 8 VIDEO

9 LANGUAGE

10 MFLG1 11 MFLG2 12 MFLG3

13 MFLG4

1 MTS

3 TEXT

14 MEM_INI

Switching items using the CH

IIC

TUNER OK

AUDIO OK

EEPROM OK

AV SW OK

RESIZE OK

NT3 B/G —

TUNER

C4 5 64 8E 1

HIGH CENTER LOW

NT3 B/G ó

1 V01

6. SELF DIAGNOSTIC FUNCTION

1) Press the "9" button on the Remote Controller while the

setting menu is displayed in the service mode.

The diagnosis will begin to check if the interface between

the IC's has been executed properly.

2) The following displays are shown on the screen during

the diagnosis.

Item

POWER

BLOCK

UV V1 V2

Result

Up to 255 times

Color classification

Green: Normal blocks

White: Non-diagnostic blocks

Red: Inspection requiring blocks

Description

Displays an abbreviated protection signal (the last circuit used) and

the number of detections.

Performs a diagnosis when a synchronization signal is detected from

the input or AUDIO/VIDEO signal is found to be present or absent.The

faulty location is displayed in color.

Execute a one-time diagnosis for the first time by pressing the 9 button

on the Remote Controller.

(1) Part number of microprocessor (QA51)

(4) RESIZE : Displays theresize firmware version.

(2) If all is well, the protecting circuit should display "00."

When the circuit displays another number, over current

is apt to flow, posing a risk of damage to the circuit parts.

(3) BLOCK

UV: TV reception mode

V1: VIDEO input mode ( 1)

V2: VIDEO input mode ( 2)

23 .....

.....

POWER : 00

BLOCK :UV V1 V2

(1)

(2)

(3)

RESIZE : 04

(4)

LOCATION OF CONTROLS

Input source

selection

CHANNEL

Channel selection

Menu item selection

Power on/standby button

Remote sensor

VOLUME –/+*

Volume down/up

Menu item adjustment

Left side

Power on indicator (green)

(1) (S-video/Video/

Audio/Component

video input)

(Antenna input)

(Audio output)

(2) IN

(S-video/Video/

Audio input)

Power standby

indicator (red)

DC IN 19V

(Power input)

Front Right side

* Dual function buttons.

Headphone jack ( 3.5mm)

For private listening, connect

headphones.

The sound from the speakers

will be cut off automatically.

To adjust the volume, press

the VOLUME –/+

Cable holder

Used to bundle the connected cables from the TV.

To use the smaller holder, open the catch, arrange

the cables across it and press to close.

Back

Cables

– 10 –

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