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4 Troubleshooting
4-2 GH19B*
CONFIDENTIAL
4-1-2 No Video [Analog]
Check signal cable and connection.
Check PC Signal.
No
No
No
Does the analog video signal appear at
R718, R717, R716? (RED, GREEN, BLUE)
Yes
Check R582, R211
and related circuit.
Check PC Signal.
Does the sync signal appear
at Pin 4 of R582 and R211?
(A_H*V_SYNC, A_V_SYNC)
No
Check IC521 and related circuit.
No
Check IC301 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))
Yes
Does the video signal
appear at the output port?
10 11
Does the video signal appear
at the Pin 48, 47, 46, 45, 42, 41, 40, 39, 38, and 37 of
IC401 and IC402?
Yes
Does proper ‘High’ appear at ‘Collector’ of Q108?
Check TFT-LCD panel and Inverter.
Yes
Replace IC401 or IC402.
Yes
9 8 7 6
5
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)
?
4 3 2
1