Main Board - Sanyo C29LF41 Service Manual

Service Adjustments
Items 35-42 GREY SCALE
1. Receive a monochrome circular pattern.
2. Set the brightness and colour to normal, contrast to maximum.
3. Enter to the service mode.
4. Set each value of Item-35 RBIAS, 36 GBIAS, 37 BBIAS mode to 00. Set each value of Item-38 RDRIV, 40 BDRIV
mode to 64, 39 GDRIV to 08.
5. Select Item-41 mode to be one horizontal scanning line and turn the screen volume on the FBT to obtain just vis-
ible one coloured line.
6. Press the 1 (Red Bias +), 4 (Red Bias -), 2 (Green Bias +), 5 (Green Bias -), 3 (Blue Bias +) or 6 (Blue Bias -)
button to adjust the brightness of each colour until a dim white line produced. Please see the control button alloca-
tions in this mode.
7. Select Item-42 DRV mode to enter the white balance adjusting mode.
8. Press the 7 (Red Drive +), RECALL (Red Drive -), 8 (Green Drive +), 0 (Green Drive -), 9 (Blue Drive +) or
SLEEP (Blue Drive -) button alternately to produce normal black and white picture.
9. Exit from the service mode.
10. Check for proper grey scale tracking at all brightness levels.
NOTE: If the grey scale adjustment is made after picture tube replacement, check the high voltage.
Red Drive -
Red Drive +
Red Bias +
Red Bias -
Green Drive +
Green Drive -
Press the MENU but-
ton to exit from service
mode
Green Bias +
Green Bias -
Blue Bias +
Blue Bias -
Blue Drive +
Blue Drive -

MAIN BOARD

-13-
SCREEN VR
(Under side)