Troubleshooting - Samsung SyncMaster 570B TFT Service Manual

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 (CN15MSS/MOS)
Does proper DC 12 V appear at
DC jack connected to CN101?
Yes
Does proper DC 3.3 V appear at
Pin 4 of IC104?
Yes
Check IC102, IC104, Q101 or
IC105, IC106
SyncMaster 570B TFT / 580B TFT
No
Check SMPS or CN809.
No
Check IC104.
4-1