Samsung PC24NS Troubleshooting

5 Troubleshooting

5-1 No Power

Does proper DC 14 V appear at

DC jack connected to CN801?

Yes

Does proper DC 5 V appear at

Pin 2 of IC811 and IC812?

Yes

Does proper DC 5 V appear at

Pin 2 of IC810?

Yes

Does proper DC 2.5 V appear at

Pin 2 of IC805 and IC815?

No

No

No

No

Check SMPS PCB and Adapter.

Check IC811 and IC 812

Check IC810.

Check IC805 and IC815

.

Yes

Does proper DC 3.3 V appear at

Pin 2 of IC801 and IC802?

Yes

Check IC806 and IC808.

No

Check IC801 and IC802

PC24NS 5-1

5 Troubleshooting

5-2 No Video (PC Analog Signal)

Power indicator is green

Does the signal appear at Pin 7,

15 and 22 of IC204, IC206?

Yes

Does the clock pulse appear at

Pin 115 and 117 of IC204?

Yes

Does the clock pulse appear at

output of R509?

Yes

Does the clock pulse appear at

Pin 54~56 of IC700?

No

No

No

No

Check R901~R903, C241~C243,

R904~906, C266,C267, and C269.

Check IC204 and related circuit of IC204.

Check related circuit of IC502.

Check IC602 and related circuit of IC602.

Yes

Does the clock pulse appear at

Pin 28~50 of IC700?

Yes

Replace LCD Panel.

5-2 PC24NS

No

Check IC700 and related circuit of IC700.