Troubleshooting - Samsung SyncMaster 150T Service Manual

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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

Does proper DC 12V appear at

DC jack connected to CN102?

Yes

Does proper DC 5V appear at

output Pin of IC100?

Yes

Does proper 5V-signal

appear at Pin 42 of IC701

(SW-REG-EN)?

Yes

Check Q101, Q102 and Q103.

SyncMaster 150T

Check DC Adaptor.

Check IC104.

Check IC701 and related circuit.

(CN100, Function Key)

4-1

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