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4 Troubleshooting
GH19B* 4-3
CONFIDENTIAL
WAVEFORMS
1 2 3
Does the input signal appear at Pin 27, 28, 30, and 31
of IC401 and IC402
(DHS,DVS,DEN,DCLK)
?
4-1-3 No Video [Digital]
Check signal cable and connection.
Check PC Signal.
No
Does the signals appear at R301, R302,
R303,R304, R305, R306, R307, and R308?
Check IC301 and related circuit.
No
Yes
Does the video signal appear at the output port?
12
151413
No
4 3 2
1
Does the video signal appear
at the Pin 48, 47, 46, 45, 42, 41, 40, 39, 38, and 37of
IC401?
Yes
Does porper ‘High’ appear at ‘Collector’ of Q108?
Check TFT-LCD panel and Inverter.
Yes
Replace IC401 and IC402.
Yes
9 8 7
6
Check Q108, IC521 and related circuit.
No
Check IC521 and related circuit.
No
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))
5