29A3DE View Datasheet(PDF) - Toshiba

Part Name

Description

Manufacturer

29A3DE

SCHEMATIC DIAGRAM

Toshiba 

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.

<SELF CHECK>

Indicated color of mode now selected : Green and Red

Indicated color of other modes

: White

ᕃ 23******

ᕄ POWER

: 00

ᕅ BUS LINE : OK

ᕆ BUS CONT : OK

ᕇ BLOCK

: UV V1 V2

QV01

Green : Normal

Red : The microcomputer operates to provide judgement

of no video signal. The red color is still indicated

though the signal is input, failure may exist in input

signal line including QV01.

QV01 : In case of indication green ---Normal

In case of indication red with input signal----

Failure may exist in output line including QV01.

ᕃ Part number of microcomputer (QA01)

ᕄ Operation number of protecting circuit ----“00” is nor-

mal.

When indication is other than “00”, overcurrent apts to

flow, and circuit parts may possibly be damaged.

ᕅ BUS LINE CHECK ----“OK” is normal.

“SDA1-GND” ------------- SDA-GND short circuit.

“SCL1-GND” -------------- SCL-GND short circuit.

“SCL1-SDA1” ------------- SCL-SDA short circuit.

ᕆ BUS CONT ----“OK” is normal.

When indication shows “Q uuu NG”, the device with

the number may possibly be damaged.

ᕇBLOCK

UV : TV reception mode

V1 : VIDEO 1 input mode (a1)

V2 : VIDEO 2 input mode (a2)

NOTE: Component which controls character display on

screen is QT01 (TELETEXT IC.). If this display

function fails to operate due to damage in QT01,

self diagnosis procedure is as follows.

(1) In case that power indicator is blinking with

interval of 0.5 seconds; it means protecting cir-

cuit (Current limiter) is operating, and circuit

components may possibly be damaged. Check

related components.

(2) In case that power indicator is blinking with

interval of 1 second; Protecting circuit does

not operate, but a part of Bus line does not

operate normally. Check Bus line.

* The items marked with are not usable to display in the SELF DIAGNOSTIC FUNCTION for some model.

–8–

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