Sylvania 6626LDG A, Service Manual, Page: 23 / 74

6-2 L4350EA
1. Purity Check Mode
This mode cycles through full-screen displays of red,
green, blue, and white to check for non-active pixels.
1. Enter the Service mode.
2. Each time pressing [7] button on the service
remote control unit, the display changes as
follows.
The following adjustment normally are not
attempted in the field. Only when replacing the
LCD Panel then adjust as a preparation.
2. White Balance Adjustment
Purpose: To mix red, green and blue beams correctly
for pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
Note: Use service remote control unit
1. Operate the unit for more than 20 minutes.
2. Input the White Purity (APL 80% or APL 20%).
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 [VOL
p
] button on
the remote control unit and select “C/D” mode.
5. When “x” value and “y” value are not within
specification, adjust “DB (C/D)” or “DR (C/D)”.
Refer to “1. Initial Setting.”
Note: “DB(C/D)” or “DR(C/D)” must be adjusted
within ±0.01.
6. Turn the power off and on again. (Main power
button on the TV unit.)
[7] button
Note:
When entering this mode, the default setting is White mode.
Purity Check Mode
[7] button
Red mode
Green mode
Blue mode
White mode
[7] button
[7] button
Test Point Adj. Point Mode Input
Screen
VOL.
p
buttons
[RF/VIDEO1]
C/D
White Purity
(APL 80%)
or
(APL 20%)
M. EQ. Spec.
Pattern Generator,
Color analyzer
x: 0.256 to 0.316,
y: 0.264 to 0.324
Figure
Color Analyzer
It carries out in a darkroom.
L = 3 cm
Perpendicularity
INPUT: WHITE 80%