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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 CENTER 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.
