4 Troubleshooting
CONFIDENTIAL
Check signal cable and connection.
4-1-3 No Video [Digital]
Does the video signal appear at the Pin 48, 47, 46, 45, 42, 41, 40, 39, 38, and 37of IC401? 9 8 7 6 5 Yes Is collector (BKLT-EN) of Q108 High? No Check IC301 and related circuit. No Does the input signal appear at Pin 27, 28, 30, and 31 of IC401 and IC402 (DHS,DVS,DEN,DCLK)?
12 4 3 2 1
Yes
Check TFT-LCD panel and Inverter.
Yes
Replace IC401 and IC402.
Does the signals appear at R301, R302,
13 14 15
No Check PC Signal.
R303,R304, R305, R306, R307, and R308? Yes During power on-off, does the input signal appear at Pin 14, 15, 17, 18, 20, 21 of IC521? (HCLK,HFS,HDATA(0),HDATA(1),HDATA(2),HDATA(3)) Yes Does the video signal appear at the output port? No Check IC301 and related circuit. No Check IC521 and related circuit.
WAVEFORMS
1
2
3
GH17B*
4-3
