White Balance Adjustment - Philips 32PFL3506/F7 Service Manual

The White Balance Adjustment should be
performed when replacing the LCD Panel
or Digital Main CBA.

3. White Balance Adjustment

Purpose: To mix red and blue beams correctly for
pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
Test Point Adj. Point
[VOL -]
Screen
button
M. EQ.
Pattern Generator,
Color analyzer
Figure
To avoid interference from ambient
light, this adjustment should be
performed in a dark room.
Perpendicularity
L = 1.18 inches
INPUT: WHITE 70%, 40%
1. Operate the unit for more than 60 minutes.
2. Input the White Raster(70%=70IRE, 40%=40IRE).
INPUT SIGNAL
0IRE
Low
Light
100IRE
40%=40IRE
3. Set the color analyzer at the CHROMA mode and
zero point calibration. Bring the optical receptor
pointing at the center of the LCD-Panel at a
distance of 1.18 inches(3cm) away from the LCD-
Panel surface.
Note: The optical receptor must be set
perpendicularly to the LCD Panel surface.
4. Enter the Service mode. Press [VOL -] button on the
remote control unit and select "C/D" mode.
Mode Input
White Raster
[VIDEO1] (APL 70%)
C/D
or
(APL 40%)
Spec.
x= 0.272 ± 0.005
y= 0.278 ± 0.005
Color Analyzer
0IRE
High
Light
100IRE
70%=70IRE
5. [CUTOFF]
Press [1] button to select "COR" for Red Cutoff
adjustment. Press [3] button to select "COB" for
Blue Cutoff adjustment.
[DRIVE]
Press [4] button to select "DR" for Red Drive
adjustment. Press [6] button to select "DB" for Blue
Drive adjustment.
6. In each color mode, press [CH + or -] buttons to
adjust the values of color.
7. Adjust Cutoff and Drive so that the color
temperature becomes 12000°K (x= 0.272 /
y= 0.278 ± 0.005).
8. To cancel or to exit from the White Balance
Adjustment, press [PREV CH] button.
5-3 A17F6EA