TOSHIBA 46H84 - 51H84 - 57H84 - 46H84C = 51H84C - 57H84C SERVICE MODE AND BLOCK DIAGRAM

TOSHIBA 46H84 - 51H84 - 57H84 - 46H84C = 51H84C - 57H84C SERVICE MODE AND BLOCK DIAGRAM

 

 ENTERING TO SERVICE MODE

1) Press MUTE button twice on Remote Control.

2) Press MUTE button again to keep pressing.

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

KEY FUNCTION IN THE SERVICE MODE
The following key entry during display of adjustment menu provides special functions.
Screen adjustment mode ON/OFF: TV (ANT)/VIDEO button (on TV)
Selection of the adjustment items : Channel UP/DOWN (on TV or Remote)
Change of the data value : Volume UP/DOWN (on TV or Remote)
Adjustment menu mode ON/OFF : MENU button (on TV)
Initialization of the memory (QA02) : RECALL+Channel button on TV (UP )
Initialization of the self diagnostic data: RECALL+Channel button on TV ( DOWN)
“RCUT” selection : 1 button
“GCUT” selection : 2 button
“BCUT” selection : 3 button
“SCNT” selection : 4 button
“COLC” selection : 5 button
Convergence adj : 7 button
Self diagnostic display : 9 button

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

 ADJUSTING THE DATA
1) Pressing of VOLUME UP or DOWN  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 RECALL 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 “Programming Channel Memory” on the owner's manual.
CAUTION: Never attempt to initialize the data unless QA02 has been replaced.

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.

CRT REPLACEMENT
When CRT is replaced, main deflection readjustment and color matching are required. Perform following procedures.
1. Replace two CRT’s of blue and red.
2. Perform horizontal adjustment for blue and red yokes on base of green CRT data. Mount yoke and velocity mod. coil alignment, pushing towards CRT without gap.
3. Adjust alignment of blue and red. (Refer Alignment adjustment for details.)
4. Rotating centering magnet, adjust CRT centers of red and blue to CRT center of green. (Picture position adjustment)
5. Adjust HIT and WID data of main deflection, and decide data at the most precise screen comparing to green data.
6. Adjust convergence of screen picture for color matching. Do not move green one at this time.
7. After convergence adjustment of screen picture finishes, replace green CRT. For green CRT as well, repeat steps 2 to 5 above on bases of red and blue color matching to adjust convergence.
8. Execute TOUCH FOCUS following instructions displayed on the screen after finishing convergence adjustments of all the colors.
Note: Press button "7" again after "PLEASE PUSH TOUCH FOCUS" has been displayed. Then, TOUCH FOCUS will not be executed, and the current state of convergence will be displayed.

HOW TO CLEAN SCREEN
When cleaning the screen, use a soft cloth so as not todamage the screen.
1. Wipe the screen with a dry cloth to remove moisture on the screen.
Note : Absolutely do not use detergent, water, alcohol, benzine, thinner, etc. for cleaning in order not to wipe away the black print on the surface.

BLOCK DIAGRAM 

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