White Balance Adjustment - Philips 19PFL3504D/F7 Service Manual

The white balance adjustment should be
performed when replacing the LCD Panel
or Digital CBA.

3. White Balance Adjustment

Purpose: To mix red, green and blue beams correctly
for pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
Test Point Adj. Point
[VOLUME
[VIDEO1]
Screen DOWN]
button
M. EQ.
Pattern Generator,
Color analyzer
Figure
To avoid interference from ambinent
light, this adjustment should be
performed in a dark room.
Perpendicularity
L = 3 cm
INPUT: WHITE 70%, 40%
1. Operate the unit for more than 20 minutes.
2. Input the White Raster(70%=70IRE, 40%=40IRE).
INPUT SIGNAL
0IRE
Low
Light
100IRE
40%=40IRE
3. Set the color analyzer to the CHROMA mode and
bring the optical receptor to the center on the
LCD-Panel surface after zero point calibration as
shown above.
Note: The optical receptor must be set
perpendicularly to the LCD Panel surface.
4. Enter the Service mode. Press [VOLUME DOWN]
button on the service remote control unit and select
"C/D" mode.
Mode Input
White Raster
(APL 70%)
C/D
or
(APL 40%)
Spec.
x= 0.272 ± 0.005
y= 0.278 ± 0.005
Color Analyzer
0IRE
Hight
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 [CHANNEL UP/DOWN]
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).
5-3 LC7NEA