(No.YA712<Rev.002>)1-13
4.6
VCOM ADJUSTMENT
(1) Operate the unit for more than 20 minutes.
(2) Set the color analyzer and bring the optical receptor to the
center on the LCD-Panel surface after zero point calibra-
tion as shown above.
Note:
The optical receptor must be
set perpendicularly to the LCD Panel surface.
(3) Enter the Service mode.
(4) Press [3] button on the service remote control unit.
(5) Press [CHANNEL UP/DOWN] buttons on the service re-
mote control unit so that the color analyzer value becomes
minimum.
4.7
WHITE BALANCE ADJUSTMENT
The white balance adjustment should be performed when
replacing the LCD Panel or Digital PWB.
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 af-
ter 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 be-
comes 12000
°
K (x= 0.272 / y= 0.278 ±0.005).
Test Point
Adj. Point
Screen
[CHANNEL UP/DOWN ]
buttons
M. EQ.
Spec.
Color analyzer
See below
Figure
Color Analyzer
To avoid interference from ambinent
light, this adjustment should be
performed in a dark room.
L = 3 cm
Perpendicularity
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
