White Balance Adjustment - FUNAI LCD-B1504 Service Manual

The following adjustment normally are not
attempted in the field. Only when replacing the
LCD Panel then adjust as a preparation.

4. 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
VOL. p
Screen
buttons
M. EQ.
Pattern Generator,
Color analyzer
It carries out in a darkroom.
Perpendicularity
L = 50 cm
INPUT: WHITE 80%
1. Operate the unit for more than 20 minutes.
2. Input the White Purity (APL 80% or APL 40%).
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. [RF/AV2(CVBS)]
Enter the Service mode. Press "VOL p" button on
the remote control unit and select "C/D/S-1" mode.
[AV1(RGB)]
Enter the Service mode. Press "VOL p" button on
the remote control unit and select "C/D/S-2" mode.
5. [RF/AV2(CVBS)]
When "x" value and "y" value are not within
specification, adjust "DB (C/D/S-1)" or "DR (C/D/S-
1)". Refer to "1. Initial Setting."
Note: "DB(C/D/S1)" or "DR(C/D/S1)" must be
adjusted within ±10.
[AV1(RGB)]
When "x" value and "y" value are not within
specification, adjust "C-DB(C/D/S-2)" or "C-DR(C/
D/S-2)". Refer to "1. Initial Setting."
Note: "C-DB(C/D/S-2)" or "C-DR(C/D/S-2)" must
be adjusted within ±10.
6. Turn the power off and on again. (Main power
button on the TV unit.)
Mode Input
White Purity
[RF/AV2(CVBS)]
C/D/S-1 (APL 80%)
[AV1(RGB)]
or
C/D/S-2
(APL 40%)
Spec.
x: 260 to 320,
y: 270 to 330
Figure
Color Analyzer
6-3 L4101EA