5
TFT-LCD DRIVER BOARD ALIGNMENT
OSC FREQUENCY ADJUSTMENT
1. Adjust the voltage of VR-OSC to -1.2
∼
-1.6 V.
2. Turn off and turn on unit.
3. Measure the frequency between VD716 and R781 with X10 probe. It should be 19.8
∼
20 MHz,
and the value shoulb be steady comparatively.
VCO CHECK
Measure the frequency between X601 and X602 with X10 probe. at NTSC system, the frequency is
3.579545 MHz (
±
1 kHz), when change to PAL system by remote, the frequency is 4.433619 MHz
(
±
1 kHz).
IMAGE CE
N
TER POSITION ADJUSTMENT
Playing VCD test disc, make the image locate ceter of TFT panel by adjustment VR-BCK.
DRIVER BOARD FUNCTION CHECK
1. Image reverse check:
press “reverse display” key on key board, the image on TFT panel can be 180º reversed.
2. NTSC / PAL switchover check:
switch NTSC / PAL system by remote, there are a abviously color change on TFT panel,
but the color change can not be colorless.
