Toshiba 20VL44G Bedienungsanleitung

TOSHIBA LC CHASSIS

20VL44G 20VL55 20VL63

TFT- LCD TV SERVICE MANUAL

CONTENTS

PAGES

Safety instructions 1

Technical specifications 2

Power rating and Panel Specifications 3

Remote control explanations 4

Service Menu of the TV 5

Set appearrances 9

Block diagram of the VCTI 10

Block diagram of Microcontroller (Genesis) 11

Block diagram of power supply 12

Data sheet of important IC’s 14

Service mode items and explanations 12

Replacement part List 23

Frequency list of channels

SAFETY PRECAUTIONS

GENERAL GUIDELINES

1. Always use the manufacturer’s replacement safety

components. The critical safety components marked

with on the schematics diagrams should not be

by other substitutes. Other substitute may create the

electrical shock , fire or other hazards. Take

attention to replace the spacers with the originals.

Furthermore where a short circuit has occurred ,

replace those components that indicate evidence of

overheating.

2. After servicing , see that all the protective devices

such as insulation barriers, insulation papers, shields

and isolation R-C combinations are correctly

installed.

3. When the receiver is not being used for a long time

of period of time , unplug the power cord of the

Adaptor from the AC outlet.

Color TFT LCD Module is very sensitive

both electrically and physically.Users,

therefore, are requested to follow the

“Guidance of handling color TFT LCD

Module”on the followings.

1-Be careful not to make scratch on the

polarizer.

Surface of polarizer is soft and can be physically

damaged easily.

Please do not touch, push or rub polarizer surface

with materials over HB hardness.

2 -Keep clean the surface.

Please wear rubber glove when touch the surface of

LCD screen. Please use soft and anti-static material

as cleaner.

3 -Keep out of water.

Water on/in the LCD may cause electrical short or

corrosion. Please wipe out dry or water carefully.

4 -Prevent swift Temperature &

Humidity change.

Instantaneous temperature and/or humiditychange

can make dew or ice which cause nonconformance

such as malfunction.

5 High temperature & high humidity

reduce the life-time.

LCD is not proper to be used at high temperature

and high humidity. Please keep specified

temperature and humidity condition.

6 -Keep out of Corrosive Gas.

Corrosive gas effect the polarizer and the circuit

chemically and cause defects accordingly.

7 -Electrostatic discharge can make

Damage

There are electro-static sensitive components such

as CMOS in LCD Module. Please earth human

body when handle the LCD.In addition, please do

not touch the interface connector pin with bare.

8 -Do not operate for a long time under

the same pattern

Operating LCD for a long time under the same

pattern can cause image persistence and can

damage it. Please follow following guidance.

1. Turn the power off when do not use.

2. Change the pattern periodically.

Receiving System PAL B/G+I+D/K SECAM L/L'

Tuning System PLL FST

Comb Filter Adaptive 4H\2H

LTI, CTI Filters Optional

Sync On Green (SOG) support on graphics YES

Scaling Upto SXGA at 75Hz

Stereo Decoding (German A2, Nicam, BTSC) German A2, Nicam

Virtual Dolby Optional

Subwoofer Optional

YPbPr In (Progressive) Through D-sub 15 conn. Optional

Number of speakers 2 (L+R)

Level (1.5, 2.5, Teleweb) Teletext 1.5

Type

No Text- Optional

Fast Text -Optional

Top Text&Fast-Default

List Mode Optional

Page Memory 10p

Supported Menu Languages

ENGLISH, DEUTSCH, DUTCH, FRANCAIS,

ESPAÑOL, ITALIANO, PORTUGUESA,

EHΛΛNIKA, SVENSKA, NORSK, SUOMI,

TÜRKÇE, POLSKI, MAGYAR, ČEŠTINA,

ROMANESTE, SLOVENČINA, DANSK,

SERBIAN, PЧCCKИЙ, Bulgarian, Crotian

>> 22 Languages

4:3 YES

16:9 4:3 Panels: Depends on LCD

16:9 Panels: YES

14:9 4:3 Panels: NO

16: 9 Panels: Depends on LCD

Panorama NO

Letterbox 4:3 Panels: NO

16: 9 Panels: Depends on LCD

Subtitle 4:3 Panels: NO

16: 9 Panels: Depends on LCD

Zoom NO

WSS (Wide Screen Signalling) Optional

ATS (Automatic Tuning System) Frequency Search

Manual Search Frequency Search

AFT (Auto Fine Tuning) YES

Number of Program Storage 100

No Ident Timer YES

Equalizer YES

AVL (Automatic Volume Level) YES

Sound Status Memory YES

Picture Status Memory YES

Zapping\Swap Optional

Panel Lock YES

Picture Format Switching Through Scart (Pin 8) YES

Auto RGB Detect Through Scart (Pin 16) YES

Timer On\Off or Sleep Optional

Picture Smart Modes YES

Sound Smart Modes YES

Simple Hotel Mode Optional

Stby to On in PC mode

when last watched is PC Optional

Stby to On automatically

when PC signal is available Optional

Memory Card Reader Optional

Teletext

Picture Formats

(4:3, 16:9, 14:9, Panorama, LetterBox, Subtitle)

Wake Up in PC

SPECIFICATIONS

15" 17" 20" 22W" 26" 27" 32"

Adaptor Input 12V 12V 15V 24V Built-in Power Built-in Power Built-in Power

Current rating 3A 4A 4A 3A

Power consumptions 48W 60W 75W 100W 130W 130W 130W

St-By Power

Consum

tion <3W <3W <3W <3W <3W <3W <3W

Input Range 100-240V/50, 60Hz 100-240V/50, 60Hz 100-240V/50, 60Hz 100-240V/50, 60H

100-240V/50, 60Hz 100-240V/50, 60

100-240V/50, 60Hz

Audio Output Power

(

%10

)

THD 2X2W 2X3W 2X3W 2X7W 2X7W 2X7W

Manufacturer

Samsung

CMO

AUO

Samsung CMO AUO Samsung

Samsung

LG-Philips

AUO

Chimei Chimei

Interface Double TTL\Single

LVDS Dual LVDS Single TTL\Single

LVDS Single LVDS Singlel LVDS Singel LVDS Singel LVDS

Resolution XGA (1024x768) SXGA

(1280x1024)

SVGA (800x600)

VGA (640x480)

WXGA

(1280x720) WXGA (1280x768) WXGA

(1280x720) WXGA (1280x720)

Brightness (cd/m2)> 250 300 500 450 450 550 550

Contrast> 300 400 500 500 400 600 600

POWER RATING AND PANEL SPECIFICATION

1.Picture Format ( )

2. Temporary mute of volume (MUTE) ( )

3.Numeric buttons

4. Audio/Video (AV) ( )

5.PC mode transition ( )

6. Teletext / MIX / TV choice buttons ( )

7. Up (Menu -Teletext) ( )

8. Left (Menu) ( )

9. Volume UP ( )

10. Volume DOWN ( )

11. Red Fastext Button

12. Green Fastext Button

13. Index Button (P100) ( )

14. Question/Answer button (REVEAL) ( )

15. UPDATE Button ( )

16. SUB PAGE Button ( )

17. STAND-BY Button ( )

18. Return to Selected Program Button (SWAP) ( )

19. TV mode transition button ( )

20. Menu Button ( )

21. OK Button ( )

22. Right (Menu) ( )

23. Down (Menu/Teletext) ( )

24. Program up button (P+) ( )

25. Program down button (P-) ( )

26. Blue Fastext Button

27. Yellow Fastext Button

28. STOP Button ( )

29. Teletext enlarge button (DOUBLE) ( )

30. Equalizer selection button ( )

31. Picture control button ( )

REMOTE CONTROL

123

456

789

AV SWAP

PC TV

TXT/MIX MENU

VOL+

172

519

12 27

13 28

14 29

15 30

VOL-

‹?

PR+

PR-

SERVICE MENU OF THE TV

ITEM NAME OPTIONS/ VALUES

DEFAULT VALUES OR

SETUP

OPTIONS

SCART 2 ON/OFF OFF

FAV ON/OFF ON

SVHS ON/OFF ON

HOTEL MODE ON/OFF OFF

STBY RECALL ON/OFF OFF

RECALL LAST AV ON/OFF OFF

MSP CARRIER MUTE ON/OFF OFF

WSS RF ON/OFF ON

AUTO AV 16:9 ON/OFF ON

FIRST ATS ON/OFF OFF

BACKLIGHT POL ON/OFF OFF

FACTORY MODE ON/OFF OFF

ADJUSTMENTS

WHITE R 0-255 128

WHITE G 0-255 128

WHITE B 0-255 128

BRIGHTNESS 0-255 130

CONTRAST 0-257 158

COLOR 0-255 128

PRESCALE FM 0-127 37

PRESCALE NICAM 0-127 63

PRESCALE SCART 0-127 27

HOTEL VOLUME 0-63 16

AGC 0-31 23

FACTORY RESET

SW DOWNLOAD

SELECTIONS

TUNER TYPE PHILIPS , SAMSUNG PHILIPS

TELETEXT FAST&TOP , NO TEXT ,FAST FAST&TOP

TIMER MODE SLEEP TIMER OFF TIMER SLEEP TIMER

MSP CLIP REDUCE VOL REDUCE

VOLUME REDUCE VOL

SWAP/ZAPP ZAPP

DOLBY VIRTUEL ON/OFF OFF

LC (L5C) SERVICE MENU

Service Menu is entered by pressing 9, 3, 0, 1 keys on the remote controller when the Picture icon is

highlighted in the Main Menu.

Service Menu has 3 sub-menus. These are:

•Options

•Adjustments

•Selections.

Navigation through these menus can be done by pressing OK button. Every adjustment made in this

menu is saved automatically.

OPTIONS

Options are adjustments that the user can select On or Off.

•SCART 2

•FAV

•SVHS

•HOTEL MODE

•STAND BY

•MSP CARRIER MUTE

•WSS SCART

•FIRST ATS

SCART 2 / FAV / SVHS

If a source is disabled in the Service Menu, it will be skipped during source switches. If SCART2 is

enabled, SW assumes that the FAV source share the same path as the SVHS source on the HW. If it is

disabled, it is assumed that FAV and SVHS share separate paths. TUNER and SCART1 are enabled by

default.

HOTEL MODE

Enabling Hotel Mode has two effects. First, SETUP menu is no longer accessible by the user. Second,

maximum adjustable volume value is limited to HOTEL VOLUME value. This value can be adjusted in the

ADJUSTMENTS sub-menu of the Service Menu.

STAND BY

If this Option is OFF, the TV will stay in Stand By mode after a Power On. If this Option is ON, the TV will

recall its last stand by status before the Power Off, and switch on from Stand By automatically, if the last

state was ‘Stand by On’.

MSP CARRIER MUTE

If this option is ON, sound processor’s carrier mute functionality will be enabled. The MSP will mute the

sound automatically if the signal quality is bad. Setting this option Off will disable this functionality.

ATS

If this option is set to ON, TV will display Country Selection menu in the next start. After some country is

selected, the user will be prompted for the start of AutoProgramming process.

ADJUSTMENTS

This sub-menu contains numeric adjustments. These items are:

•WHITE R

•WHITE G

•WHITE B

•BRIGHTNESS

•CONTRAST

•COLOR

•PRESCALE FM

•PRESCALE NICAM

•PRESCALE SCART

•HOTEL VOLUME

WHITE R / WHITE G / WHITE B

These are used for color bias adjustment. Unlike other items in the service menu, changes will take effect

immediately.

PRESCALE FM / PRESCALE NICAM / PRESCALE SCART

These are prescale values that will be used for the initialization of the sound processor (MSP), at the next

switch on.

HOTEL VOLUME

This value is used as the volume limit, when the Hotel Mode is on.

SELECTIONS

This sub-menu contains selections.

•TUNER TYPE SAMSUNG / PHILIPS

•TELETEXT NO TEXT / FAST / FAST&TOP

•MSP CLIP REDUCE VOL / REDUCE TONE

TUNER TYPE

One of two supported tuner can be selected from this item. System must be restarted for this change to

take effect.

TELETEXT

NO TEXT: Teletext is totally disabled. TXT/MIX button will not be functional. AUTO picture format mode

will be disabled in RF, F-AV and SHVS modes. Naming and sorting functionality during Autoprogramming

will be disabled.

FAST: TOPtext functionality will be disabled.

FAST&TOP: TOPtext functionality is enabled.

TIMER MODE

If OFF TIMER is selected, the user will be able to enter time of the day info for the TV to switch off. If

SLEEP TIMER is selected, the user can specify some time period, after which the TV will go to stand by

automatically.

MSP CLIP

This selection identifies which method will be used by the sound processor to prevent clipping effects on

volume.

AUTOPROGRAMMING

When the user selects the Autoprogram item in Setup menu, Country Selection menu is opened. The user

must select a country before the Autoprogramming starts. Broadcast system will be selected according to

the country selected.

Broadcast systems according to countries:

BELGIUM BG + L

CROATIA BG

CZECH REP. DK

DENMARK BG

FINLAND BG

FRANCE L + BG

GERMANY BG

GREECE BG

HUNGARY DK

IRELAND I

ITALY BG

NETHERLANDS BG

NORWAY BG

POLAND DK

PORTUGAL BG

SPAIN BG

SWEDEN BG

SWITZERLAND BG + L

TURKEY BG

UNITED KINGDOM I

For countries France, Belgium and Switzerland, autoprogramming is done twice. For Belgium and

Switzerland, first BG channels will be searched, after the search in BG is done, searching will restart for L

standard. If the selected country is France, the sequence of standards is reversed, thus, first L then BG.

TELETEXT LANGUAGES

L5C SW decides which teletext language group will be used for teletext decoding, according to the

country selected for autoprogramming.Teletext languages according to countries:

EAST EUROPE:CROATIA ,CZECH_REP, POLAND

WEST EUROPE: BELGIUM ,DENMARK, FINLAND, UK, FRANCE, GERMANY,

IRELAND ,ITALY ,NETHERLANDS, NORWAY, PORTUGAL,SPAIN, SWEDEN, SWITZERLAND,

HUNGARY

TURKISH-GREEK:GREECE TURKEY

PC MODE

PC mode can be entered by pressing PC button on the remote controller. User can return back to TV

mode by pressing the PC or TV buttons.

After the switching to PC mode, VGA input will be displayed on screen, as soon as the mode (input

resolution and frequency) is determined.

If there is no input from the VGA input, NO SIGNAL dialog will be displayed for 15 seconds. At the end of

this period if there is no signal from VGA input, the TV will go to Sleep State. While in the sleep state, the

TV will keep monitoring the VGA input. If VGA signal is detected, the TV will wake from Sleep State, to PC

mode. Alternatively, the user may select to switch the TV on from Sleep State, just like switching on from

Stand-by. In this case, the set will switch on from TV mode.

Dieses Handbuch passt für folgende Modelle

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