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
15
14
13
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
Summary of Contents for 191T - SyncMaster 19" LCD Monitor
Page 11: ...Memo 2 Product Specifications 2 8 GH19B CONFIDENTIAL...
Page 17: ...4 Troubleshooting 4 4 GH19B CONFIDENTIAL 4 5 6 7 8 9 10 11 12 13 14 15...
Page 19: ...Memo 4 Troubleshooting 4 6 GH19B CONFIDENTIAL...
Page 20: ...CONFIDENTIAL GH19B 5 1 5 Exploded View and Parts List...
Page 21: ...CONFIDENTIAL 5 Exploded View Parts List 5 2 GH19B Memo...
Page 30: ...7 Block Diagram GH19B 7 1 CONFIDENTIAL...
Page 31: ...CONFIDENTIAL 7 Block Diagrams 7 2 GH19B Memo...
Page 33: ...CONFIDENTIAL 8 Wiring Diagram 8 2 GH19B Memo...
Page 35: ...9 Schematic Diagrams 9 2 GH19B 12 13 14 15 CONFIDENTIAL...
Page 37: ...CONFIDENTIAL 9 Schematic Diagrams 9 4 GH19B 10 11...
Page 39: ...CONFIDENTIAL 9 Schematic Diagrams 9 6 GH19B 1 2 3 4 6 7 8 9 5...
Page 41: ...CONFIDENTIAL 9 Schematic Diagrams 9 8 GH19B Memo...
