1-14 (No.YA683<Rev.001>)
4.5
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)
[VCOM1]
Press
[2]
key on the service remote control unit.
[VCOM2]
Press
[3]
key on the service remote control unit.
(5) Press
[P
/
]
bkey on the service remote control unit so
that the color analyzer value becomes minimum.
4.6
WHITE BALANCE ADJUSTMENT
The following adjustment normally are not attempted in the field.
Only when replacing the LCD Panel then adjust as a preparation.
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, 25%=25IRE).
(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 -] button on the
service remote control unit and select “C/D” mode.
(5)
[CUTOFF]
Press
[3]
key to select “COB” for Blue Cutoff adjustment.
Press
[1]
key to select “COR” for Red Cutoff adjustment.
[DRIVE]
Press
[6]
key to select “DB” for Blue Drive adjustment.
Press
[4]
key to select “DR” for Red Drive adjustment.
(6) In each color mode, press
[P
/
]
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
M. EQ.
Spec.
Color analyzer
See below
Figure
Color Analyzer
It carries out in a darkroom.
L = 3 cm
Perpendicularity
[P ]
buttons
/
Test Point
Adj. Point
Mode
Input
Screen
[P ]
buttons
[VIDEO]
C/D
White Raster
(APL 70%)
or
(APL 30%)
M. EQ.
Spec.
Pattern Generator,
Color analyzer
x= 0.272 ± 0.005
y= 0.278 ± 0.005
Figure
Color Analyzer
It carries out in a darkroom.
L = 3 cm
Perpendicularity
INPUT: WHITE 70%, 30%
/
30%=30IRE 70%=70IRE
INPUT SIGNAL
