Samsung 191T - SyncMaster 19" LCD Monitor Manuel de service - Page 15
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4 Troubleshooting
4-1-2 No Video [Analog]
Check signal cable and connection.
Does the video signal appear
at the Pin 48, 47, 46, 45, 42, 41, 40, 39, 38, and 37 of
9
IC401 and IC402?
Yes
Does proper '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)?
No
Does the analog video signal appear at
R718, R717, R716? (RED, GREEN, BLUE)
Yes
Does the sync signal appear
at Pin 4 of R582 and R211?
(A_H*V_SYNC, A_V_SYNC)
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?
4-2
5
8
7
6
4
3
2
1
10
11
CONFIDENTIAL
Yes
Check TFT-LCD panel and Inverter.
Yes
Replace IC401 or IC402.
No
Check PC Signal.
Check R582, R211
No
and related circuit.
Check PC Signal.
No
Check IC521 and related circuit.
No
Check IC301 and related circuit.
GH19B*