Vcom Adjustment - Sylvania LC427SSX Service Manual

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.
Purity Check Mode
White mode
Black mode
Red mode
Green mode
Blue mode
White 20% mode
Note:
When entering this mode, the default setting is White mode.
[7] button
[7] button
[7] button
[7] button
[7] button
[7] button

2. VCOM Adjustment

Test Point
Screen
M. EQ.
Color analyzer
To avoid interference from ambinent
light, this adjustment should be
performed in a dark room.
Perpendicularity
L = 3 cm
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 calibration 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 remote control unit so that the color
analyzer value becomes minimum.
5-2
Adj. Point
[CHANNEL UP/DOWN ]
buttons
Spec.
See below
Figure
Color Analyzer
LC7NEA