CONFIDENTIAL
GH15H*
4-1
4 Troubleshooting
Notes:
1. Before troubleshooting, setup the PC’s display as below.
• Resolution: 1024 x 768
• H-frequency: 48 kHz
• V-frequency: 60 Hz
2. If no picture appears, make sure the power cord is correctly connected.
3. Check the following circuits.
• No raster appears: Audio PCB, SMPS PCB, Main PCB
• 12V develop but no screen: Main PCB
• 12V does not develop: Audio PCB, SMPS PCB
4. If you push and hold the “EXIT” button for more than 5 seconds, the monitor automatically turns back
to the factory preset.
4-1 No Power
Does proper DC 12 V
appear at FT901, FT902
or Pin 1, 2 of CN101?
Check SMPS or CN101.
Yes
No
Does proper DC 3.3 V
appear at Pin 7 of CN 101?
Check SMPS.
Check IC102 and Q192.
Yes
No
Summary of Contents for GH15H series
Page 11: ...CONFIDENTIAL Memo 3 Disassembly and Reassembly 3 4 GH15H ...
Page 14: ...CONFIDENTIAL 4 Troubleshooting GH15H 4 3 1 5 6 7 2 3 4 WAVEFORMS ...
Page 18: ...CONFIDENTIAL GH15H 5 1 5 Exploded View and Parts List ...
Page 19: ...5 Exploded View Parts List 5 2 GH15H Memo CONFIDENTIAL ...
Page 31: ...Memo 6 Electrical Parts List 6 12 GH15H CONFIDENTIAL ...
Page 32: ...CONFIDENTIAL GH15H 7 1 7 Block Diagram ...
Page 33: ...CONFIDENTIAL 7 Block Diagrams 7 2 GH15H Memo ...
Page 34: ...CONFIDENTIAL 8 Wiring Diagram GH15H 8 1 8 Wiring Diagram ...
Page 35: ...Memo 8 Wiring Diagram 8 2 GH15H CONFIDENTIAL ...
Page 37: ...CONFIDENTIAL 9 2 GH15H 1 5 6 7 2 3 4 9 Schematic Diagrams ...
Page 39: ...CONFIDENTIAL 9 Schematic Diagrams 9 4 GH15H Memo ...
