SyncMaster 320TFT/520TFT 6-1
6 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.
6-1 No Power
Does proper DC 12 V appear at
DC jack connected to CN102?
Check SMPS PCB and CN816.
Yes
No
Does proper DC 5 V appear at
Pin 3 of IC109?
Check F101 and IC109.
Check IC401, RL101, D110 and Q101.
Yes
No
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