Samsung RS21-24A Troubleshooting

CONFIDENTIAL

RS21A*/RS24A* 5-1

5 Troubleshooting

Does proper DC 14 V appear at

DC jack connected to CN800?

Check SMPS PCB and Adapter.

Yes

No

Does proper DC 5 V appear at

Pin 2 of IC815 and IC816?

Check IC815 and IC 816

Check IC811 and IC817.

Yes

No

Does proper DC 2.5 V appear at

Pin 2 of IC804 and IC806?

Check IC804 and IC806

.

Yes

No

Does proper DC 3.3 V appear at

Pin 2 of IC800, IC801 and IC805?

Check IC800, IC801 and IC805.

Yes

No

Does proper DC 5 V appear at

Pin 2 of IC810?

Check IC810.

Yes

No

5-1 No Power

CONFIDENTIAL

5 Troubleshooting

5-2 RS21A*/RS24A*

5-2 No Video (PC Analog Signal)

Power indicator is green

Does the signal appear at Pin 7,

15 and 22 of IC203, IC206?

Check R226, R228, R229,

C237, C238, C239, R246, R247,

R249, C258, C260, C262.

Yes

No

Does the clock pulse appear at

Pin 115 and 117 of IC203?

Check IC203 and related circuit of IC203.

Yes

No

Does the colck pluse

appear at Pin 8 of IC207?

Check related circuit of IC207.

Yes

No

Replace LCD Panel.