TOSHIBA 38VL14G SERVICE MODE AND POWER SUPPLY CIRCUIT

TOSHIBA 38VL14G SERVICE MODE AND POWER SUPPLY CIRCUIT

TOSHIBA 38VL14G 

SERVICE MODE AND POWER SUPPLY CIRCUIT 

SERVICE MODE

ENTERING TO SERVICE MODE
1) Press MUTE  button once on Remote Control.

2) Press MUTE  button again to keep pressing.

3) While pressing the MUTE  button, press MENU button on TV set.

DISPLAYING THE ADJUSTMENT MENU
1) Press MENU button on TV.

KEY FUNCTION IN THE SERVICE MODE
The following key entry during display of adjustment menu provides special functions.
Frequency of lamp replacement CALL + RGB button
Test signal selection : POWER button (on Remote)
Selection of the adjustment items : Channel UP/DOWN (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 (QA02) : CALL + Channel button on TV (UP)
“CSBRT” selection : 1 button
“SCNT” selection : 4 button
“COLP” (or “OTHER”) selection : 5 button
“TNTC” (or “TNTV”) selection : 6 button
Self diagnostic display ON/OFF : 9 button

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

ELECTING THE ADJUSTING ITEMS
1) Every pressing of CHANNEL UP button in the service mode changes the adjustment items  (DOWN button for reverse order).

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.
EXIT FROM SERVICE MODE
1) Pressing POWER button to turn off the TV once.

INITIALIZATION OF MEMORY DATA OF QA02
After replacing QA02, 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 UP button on the TV. The initialization of QA02 has been complated.
3. Check the picture carefully. If necessary, adjust any adjustment item above.
Perform “Auto search Memory” on the owner’s manual.
CAUTION: Never attempt to initialize the data unless QA02 has been replaced.

TEST SIGNAL SELECTION
1) Every pressing of POWER  button on the Remote Control changes the built-in test patterns on screen as described below in SERVICE MODE.

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 displays are show

DESIGN MODE

ENTERING TO DESIGN MODE
1) Select the Service mode.

2) While pressing CALL button on Remote and press MENU button on TV.

3) Press MENU button on TV.

When QA02 is initialized, items “OPT0” and “OPT1” of DESIGN MODE are set to the data of the representative model of this chassis family.
Therefore, because ON-SCREEN specification remains in the state of the representative of model. This model is required to reset the data of items “OPT0” and “OPT1”

SELECTING THE ADJUSTING ITEMS
Every pressing of CHANNEL DOWN button in the design mode changes the adjustment items. (UP button for reverse order)

ADJUSTING THE DATA
Pressing of VOLUME UP or DOWN  button will change the value of data.

ELECTRICAL ADJUSTMENTS

Bright adjustment (CSBRT) and white balance adjustment RDRV BDRV

1 Connect the CSBRT adjusting signals to the video input.
2 Install the W/B checker on the screen.
3 Select CSBRT at adjusting mode.
(The CSBRT data is changed to 52 from the initial value by a microcomputer, and both screen brightness will turn to MAX.)— To be dealt with by the production line
4 Adjust the CSBRT data so that the brightness at the time turns to (Normally White) x A%.
(When the data is adjusted, the SCBRT data returns to the initial value and screen brightness declines)
A = 70±5 %
5 Connect the 501RE white signals to the video input and adjust by RDRV and BDRV so that they will come to the following values.
x = 0.280±0.005
y = 0.330±0.005
6 As shown in 4 again, repeat 5 after adjusting the CSBRT data

POWER SUPPLY CIRCUIT 

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