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4 Troubleshooting
4-1-3 No Video [Digital]
Check signal cable and connection.
Does the video signal appear
at the Pin 48, 47, 46, 45, 42, 41, 40, 39, 38, and 37of
IC401?
9
Yes
Does porper 'High' appear at 'Collector' of Q108?
No
Check Q108, IC521 and related circuit.
No
Does the input signal appear at Pin 27, 28, 30, and 31
of IC401 and IC402 (DHS,DVS,DEN,DCLK)?
Does the signals appear at R301, R302,
13
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?
WAVEFORMS
1
GH19B*
6
8
7
5
4
3
2
12
14
15
2
Yes
Check TFT-LCD panel and Inverter.
Yes
Replace IC401 and IC402.
1
No
Check PC Signal.
No
Check IC521 and related circuit.
No
Check IC301 and related circuit.
3
CONFIDENTIAL
4-3