Troubleshooting - Samsung SyncMaster 800TFT Service Manual

5 Troubleshooting

Notes: 1. Before troubleshooting, set up the PC's display as below.
• Resolution: 1280 x 1024
• H-frequency: 64 kHz
• V-frequency: 60 Hz
2. If no picture appears, confirm the power cord is correctly connected.
3. Check the following circuits.
• No raster appears: Stand PCB, Main PCB
• 14V develop but no screen: Main PCB
• 14V does not develop: Main PCB
4. If you push and hold the EXIT button for more than 5 seconds, the monitor automatically reverts back
to the factory preset
5-1 No Power
Does proper DC 14 V appear at
DC jack connected to CN101?
Yes
Does proper DC 5 V appear at
Pin 4 of IC101?
Yes
Does proper 5 V - signal appear at
Pin 42 of IC501 (SW_REG_EN)?
Yes
Check Q103, Q105 and Q106.
SyncMaster 800TFT
No
Check Power Adaptor.
No
Check IC101 and related circuit.
No
Check IC501 and related circuit.
(CN102, Function Key)
5-1