Philips LD427SSX, Service Manual

Page: 35 / 148

6-3 LC7NEA
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.
1. Operate the unit for more than 20 minutes.
2. Input the White Raster(70%=70IRE, 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.
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).
Test Point Adj. Point Mode Input
Screen
[VOLUME
DOWN]
button
[VIDEO1]
C/D
White Raster
(APL 70%)
or
(APL 40%)
M. EQ. Spec.
Pattern Generator,
Color analyzer
x= 0.272 ± 0.005
y= 0.278 ± 0.005
Figure
Color Analyzer
L = 3 cm
Perpendicularity
INPUT: WHITE 70%, 40%
To avoid interference from ambinent
light, this adjustment should be
performed in a dark room.
40%=40IRE 70%=70IRE
100IRE 100IRE
0IRE 0IRE
INPUT SIGNAL
Low
Light
Hight
Light