Samsung PC21PB Troubleshooting

SyncMaster 210T/240T 5-1

5 Troubleshooting

5-1 No Power

Does proper DC 12 V appear at

DC jack connected to CN801?

Check SMPS PCB and Adapter.

Yes

No

Does proper DC 5 V appear at

Pin 3 of CN802?

Check DC/DC converter.

Check IC802 and IC807.

Yes

No

Does proper DC 2.5 V appear at

Pin 2 of IC804 and IC805?

Check C804 and IC805

.

Yes

No

Does proper DC 3.3 V appear at

Pin 2 of IC801 and Pin 1 of IC810?

Check C804 and IC805

.

Yes

No

Does proper DC 5 V appear at

Pin 2 of CN809?

Check IC809.

Yes

No

5 Troubleshooting

5-2 SyncMaster 210T/240T

5-2 No Video (PC Anolog Signal)

Power indicator is green

Does the signal appear at Pin 7,

15 and 22 of IC204, IC206?

Check R901~R903, C241~C243,

R904~906, C266,C267, and C269.

Yes

No

Does the clock pulse appear at

Pin 115 and 117 of IC204?

Check IC204 and related circuit of IC204.

Yes

No

Does the clock pulse appear at

output of R551?

Check related circuit of IC502.

Yes

No

Does the clock pulse appear at

Pin 54~56 of IC700?

Check IC602 and related circuit of IC602.

Yes

No

Replace LCD Panel.

Does the clock pulse appear at

Pin 28~50 of IC700?

Yes