White Balance Adjustment - Sylvania 6620LCT A Service Manual

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

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
[RF/VIDEO1]
VOL. p
Screen
[VIDEO2]
buttons
M. EQ.
Pattern Generator,
Color analyzer
Figure
It carries out in a darkroom.
Perpendicularity
L = 3 cm
INPUT: WHITE 80%
Note: Use service remote control unit
1. Operate the unit for more than 20 minutes.
2. Input the White Purity (APL 80% or APL 13%).
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/VIDEO1]
Enter the Service mode. Press "VOL p" button on
the remote control unit and select "C/D/S-1" mode.
[VIDEO2]
Enter the Service mode. Press "VOL p" button on
the remote control unit and select "C/D/S-2" mode.
Mode Input
White Purity
C/D1 (APL 80%)
or
C/D2
(APL 13%)
Spec.
x: 0.256 to 0.316,
y: 0.264 to 0.324
Color Analyzer
5. [RF/VIDEO1]
When "x" value and "y" value are not within
specification, adjust "DB (C/D1)" or "DR (C/D1)".
Refer to "1. Initial Setting."
Note: "DB(C/D1)" or "DR(C/D1)" must be adjusted
within ±0.01.
[VIDEO2]
When "x" value and "y" value are not within
specification, adjust "DB(C/D2)" or "DR(C/D2)".
Refer to "1. Initial Setting."
Note: "DB(C/D2)" or "DR(C/D2)" must be adjusted
within ±0.01.
6. Turn the power off and on again. (Main power
button on the TV unit.)
5-3 L3222EA