Toshiba 15VL34 Manual de usuario

SERVICE MANUAL

PRINTED IN UK. 2005 C

COLOURTELEVISION

15VL34

TOSHIBA

CONTENTS

PAGES

Safety instructions 1

Technical specifications 2

Panel Specification 3

Chassis block diagram 4

Scaler block diagram 5

Block diagram of power supply 6

Chassis overwiev 7

Service mode items and explanations 12

Data sheet of important IC’s 17

Recommended Part List 29

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'

Comb Filter Adaptive 4H\2H

Scaling Upto SXGA at 75Hz

Gamma Correction 8 to 10-bit LUT

Histogram Equalization YES

Stereo Decoding

(German A2, Nicam, BTSC) German A2, Nicam

Stereo L, R In 3

Stereo L, R Out 3

Audio Output Power RMS in Max at 10% THD) 2x3W, 2x5W for 22"W

Level (1.5, 2.5, Teleweb) Teletext 1.5

Type (Fast\Top\Simple) Simple, Fast, Top

Page Memory 250p or 10p

WSS +

VPS\PDC +

4:3 +

16:9 +

Panorama +

Letterbox +

Subtitle +

WSS (Wide Screen Signalling) +

ATS (Automatic Tuning System) Frequency Search

Manual Search Channel Table Search

Number of Program Storage 100

No Ident Timer +

Picture Freeze +

Equalizer +

Zapping +

AVL (Automatic Volume Level) +

Sound Status Memory +

Picture Status Memory +

Swap +

Child Lock +

Program Lock +

Picture Format Switching Thru Pin 8 +

Auto RGB Detect Thru Pin 16 +

PC Plug & Play (DDC\CI) +

Off Timer (Sleep Timer) +

On Timer +

Picture Smart (User, Soft, Natural, Rich) +

Sound Smart (User, Music, Sports,

Cinema, Speech) +

Scart 2

S-video (DIN) 1

AV In (3 RCA) 1

AV Out (3 RCA) 1 (ONLY L, R)

D-Sub 15 1

Headphone 1

CVBS In 3

Y\C In 1

RGB+FB -Video 1

RGB+HS, VS In -Graphics 1

CVBS Out 2

L5A TECHNICAL SPECIFICATION

Picture Formats

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

Timer

Teletext

14" 15" 17" 17W" 20" 22W" 23W"

Manufacturer AUO

Samsung

Hannstar

CMO

AUO Sanyo

Samsung Samsung CMO

AUO Samsung

Interface Single LVDS Double TTL\Single

LVDS Dual LVDS Single LVDS Single TTL\Single

LVDS Single LVDS Single LVDS

Resolution VGA (640x480) XGA (1024x768) SXGA (1280x1024) WXGA (1280x768) SVGA (800x600)

VGA (640x480) WXGA (1280x720) WXGA (1280x768)

Brightness (cd/m2)> 450 250 300 400 500 450 450

Contrast> 500 300 400 400 500 500 400

Response Time

(Tr+Tf) msec < 25 35 25 25 16 25 25

Viewing Angle R\L\H\L > 85/85/85/85 60/60/40/50 70\70\60\60 70/70 50/60 80\80\60\60 85/85 85/85 85/85 85/85

Adaptor Input 12V 12V 12V 12V 15V 15V 24V

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

St-By Power Consumption <3W <3W <3W <3W <3W <3W <3W

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

PANEL SPECIFICATION

YUV

HS/VS

BLOCK DIAGRAM OF MAIN CHASSIS (L5A

)

Tuner IF Video Decoder

VPC 3230D

Teletext Decoder

SDA 5550

K6T1008V2E

SRAM

(Optional)

M29W040

Flash

Memory

MSP3410G

AUDIO DECODER

TDA1571

Stereo

Amplifier

TDA1308

Headphone

Amplifier

Scart 1 SVHS/FAV

Scart 2

Scaler

Stage

VGA-IN EEPROM

24LC02

CVBS-IF

SVHS-Y/C SC1-RGB

PANEL

HS/VS

HS/VS RGB FB

CVBS

RGB HS/VS

SIF/AM-mono

EEPROM

24LC16

BLOCK DIAGRAM OF SCALER

Panel_En Standby Mute Reset

BR1_ADJ BLK_EN

HS/VS

RGB

VGA_RGB

VGA HS/VS

GM 5221 U500

LCD

CONTROLLER

U501

PARALEL

FLASH

MEMORY

M29W040B

(OPTIONAL)

S505

PROGRAMING

CON

U503

SERIAL FLASH

MEMORY

M25P40

U502

EEPROM

24C16

KEYBOARD

CON. S509

DAUGHTER

BOARD

FOR TTL

INTERFACES

S506

CONN.

LVDS

CONNECTOR

(20 OR 30 PINS)

(S503,S502)

BAC LIGHT UNIT

S508 (LVDS) S500(TTL)

L5A POWER SUPPLY BLOCK DIAGRAM

3.3V-STBY

V-INV

DC Jack +15V-STBY

F600 15V,12V

1.8V-STBY

Fuse

+8V

2.5V

+5V 3.3V

INPUT: 12V FOR 14,15,17 INCH 5V-STBY

15V FOR 20, 22 INCH + 12V

24V FOR 23 INCH Panel

+12V Power

ONLY FOR 23 "

ONLY FOR 20, 22, 23 "

+8V

V-INV

F601

PNL-EN Power STBY

S602

S600

LM2576

U600

LM2576

U607

78L08

U606

78L12

U608

LM1117

1.8V

U605

LM1117

3.3V

U602

SDI9933ADY

LM117-3.3V

U604

78L08

U606

V-INV

+5V-STBY

L5-A Low-to-Mid End LCD-TV BOARD OVERVIEW

L5-A Low-to-Mid End LCD TV board incorporates the LCD Controller gm2221, to create a

high quality, stand-alone LCD-based TV system for consumer applications. Figure 1

illustrates the Block diagram of the board.

This board supposed to have two versions:

1. Low-End (to drive 14''-15’’ 4:3 panels)

2. Mid-End (to drive 17’’-20’’ 4:3 and 17’’-22’’-23'' 16:9 panels)

Figure 1 System Block Diagram

L5-A board supports 5 types of video and graphics inputs. These inputs are: Analog

terrestrial tuner input for multisystem PAL/SECAM transmission, SCART input (x2), S-VHS

input, RCA input and analog PC video input.

The analog RGB signals coming from the PC input (via D-Sub15 connector P401) are

directly connected to the gm2221 analog input port.

One EDID IC (U400) is provided on board to support VESA standard plug-and play

compatibility.

LOW TO MID END LCD TV WITH GM2221

Multimedia

Tuner

Chroma

Decoder

VPC 3230D

CVBS

EXT. CVBS, S-video

Scart RGB, FB

Teletext

Decoder +MCU

SDA5550

ITU 656

8-bit

GM2221

ADC+PLL

ITU 656

De-interlace

Scaling

MCU X86

OSD(4bit\pixel)

2 LVDS Tx

1p, 2p\clk

LVDS

15",

17",

20''

4:3

17''

22''

16:9

TFT

LCD

24-bit TTL

HS, VS, DE

Upto SXGA at 75Hz

Graphics

Upto SXGA at 75Hz

UXGA at 60Hz

RGB, HS, VS

EDID

VGA

SDA,SCL

FLASH

NVRAM

QSS

Audio

Decoder

MSP 3410G

QSS

Ext L/R

TDA1308T

L/R

AudioAmp

TDA1517P

Main

L/R

L R

Step Down

& Lineer

Regulators

12V

5V 3.3V2.5V

FLASH

SDRAM

Teletext

RGB, FB

Selected

Video

1.8V

On the board, one high quality video decoder (U100) is provided (VPC3230D of Micronas)

to process video inputs coming from the video sources. The video processor can process 3

composite video inputs and 1 S-Cideo input from the NTSC/PAL video sources. The CVBS

output recovered from the tuner module is made available to one of the video inputs of the

video decoder.

The digitized video output (in ITU-656 format) from U100 is fed to the dedicated video Port

of gm2221 for decoding and processing.

Gm2221 makes it possible to perform scaling and de-interlacing for the video input.

A 4Mbit serial flash ROM (U503) is used for storing system firmware. Also the footprint for

a parallel flash ROM, which can be upto 2Mbits, is available on the board. This option can

be used either for development or for production purposes.

The gm2221 provides direct connect via the integrated LVDS transmitters to LCD panels

with integrated LVDS receivers. Both single LVDS (via S503) and double LVDS(via S502)

panels can be supported directly from the L5-A main-board. For single LVDS panels, only

S503 connector is soldered on the main-board, which is a 20 pin connector. For Double

LVDS panels, only S502 connector is soldered on the main-board, which is a 30 pin

connector. For supporting different LVDS panels, different LVDS cables (either single or

double LVDS) can be made used.

For supporting different single or double TTL panels, a daughter board interface is used via

40 pin S506 connector. On this connector, the signals are 3x8bit RGB with TTL control

signals (i.e. HSync, VSync, CLK, O/E etc.) to support a wide variety of LCD panels.

Depending on the panel used, different daughter boards will be used to support that

particular panel. For single TTL panels, the daughter board will just be a routing the RGB

and control signals to the particular connector interface for that particular panel. For double

TTL panels, there will be two LVDS receiver IC’s on the daughter board (double TTL is not

directly from GM2221 but double LVDS is supporter due to IC packaging problems) to

demodulate double LVDS signal into double TTL signal.

The LCD panel resolution supported can be up to SXGA at 75 Hz or UXGA at 60 Hz.

It is important to note that at any point in time gm2221 could drive only one type of Panel.

When LVDS Panel is connected (to connector S503 or S502) ensure that the panel

backlight is connected to S508. The integrated PWM output from gm2221 is used to

control the LCD panel backlight intensity for dimming functions.

The on screen display is implemented using OSD capability of gm2221. Infra Remote (IR)

controller connector (S507) is provided as a primary control interface for connecting IR

detector to the GPIO of gm2221. An IR remote controller unit and detector provide remote

OSD menu access at user convenience.

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