CONFIDENTIAL
GG15AS/GG15AS(R)/GG15L*/GG15L*(R)/
GG15V*/GG15V*(R)/GG15E*/GG15E*(R)
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 [GG15AS/GG15L*/GG15V*/GG15E*]
Does proper DC 12 V
appear at Pin 1, 2 of CN120?
Check SMPS or CN120.
Yes
No
Does proper DC 3.3 V
appear at Pin 7 of CN120?
Check SMPS.
Check IC110 and Q132.
Yes
No
4-1-1 No Power [GG15AS(R)/GG15L*(R)/GG15V*(R)/GG15E*(R)]
Does proper DC 12 V
appear at Pin 1, 2 of CN104?
Check SMPS or CN104.
Yes
No
Does proper DC 3.3 V
appear at Pin 7 of CN104?
Check SMPS.
Check IC106 and Q132.
Yes
No
