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GH15LS/GH15ES/GH15MS 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 (GH15LS/GH15ES/GH15MS)
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