Service manual

12
Model No: 21WHS3-Bn
Version 1.0
To be fine
H. line
V. line
Magnified drawing of part
Item White balance adjustment
AKPH01 chassis
Measuring
Equipment
SG and white balance meter
service remote controller
Preparation
before Adj.
Warm up the set for more than 30 min.
Brightness, contrast and color should be set in standard
MENU9 CRT cut-off and white balance and sub-brightness adjustment.
Receive gray and white 2 steps signal.
a)
CRT cut off adjustment.
1. push [P+][P-] key to select “SC”, push [V+][V-] key then automatically vertical
scan will be stopped.
2. adjust SCREEN control on Flyback transformer to get the darkest single
horizontal line (red,
green, or blue, sometimes shows more yellow,
more purple or more white
).
3. push [V+][V-] key again, vertical scan work repeat.
b)
white balance adjustment.
a) select RD/BD menu.
b) adjustment RD/BD to get color temperature as x=282, y=292.
c)
sub-brightness adjustment (use stair case signal)
1. select SB MENU.
adjust SB to get the darkest step being out off.