Vcom Adjustment; White Balance Adjustment - Philips 39” LCD TV Service Manual

2. VCOM Adjustment

Test Point
Screen
M. EQ.
Color analyzer
Figure
To avoid interference from ambient
light, this adjustment should be
performed in a dark room.
Perpendicularity
1. Operate the unit for more than 60 minutes.
2. Set the color analyzer at the zero point calibration
and bring the optical receptor pointing at the
center of the LCD-Panel.
Note: The optical receptor must be set
perpendicular to the LCD Panel surface.
3. Enter the service mode.
4. Press [2] button on the remote control unit.
5. Press [CHANNEL UP/DOWN] buttons on the
remote control unit so that the color analyzer value
becomes minimum.
6. To cancel or to exit from the VCOM Adjustment,
press [CH RETURN] or [PREV CH] button.
Adj. Point
[CHANNEL UP/DOWN]
buttons
Spec.
See below
Color Analyzer
The White Balance Adjustment should be
performed when replacing the LCD Panel
or Digital Main CBA.

3. White Balance Adjustment

Purpose: To mix red and blue beams correctly for
pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
ITEM
Color temperature
Input Signal
Measurement point Screen center
M. EQ.
Aging time
MODE setting of TV
Ambient
temperature
1. Operate the unit for more than 60 minutes.
2. Enter the service mode.
3. Press [VOLUME DOWN] button three times on the
remote control unit to select "Drive setting" mode.
"Drive" appears in the screen.
4. Set the color analyzer at the CHROMA mode and
zero point calibration. Bring the optical receptor
pointing at the center of the LCD-Panel.
To avoid interference from ambient
light, this adjustment should be
performed in a dark room.
Perpendicularity
Note: The optical receptor must be set
perpendicularly to the LCD Panel surface.
5-2
SPECIFICATION
x= 0.272 ± 0.005
y= 0.278 ± 0.005
Internal pattern
(30/50/80% raster)
CA-310 (KONICA MINOLTA
Luminance meter) or
measuring instrument as
good as CA-310.
60min.
(Retail MODE/100IRE Raster
HDMI 1080i@60)
Shipment setting/
Retail MODE
25°C ± 5°C
Color Analyzer
PL13.11 (A3RTBUH)_EA