Samsung LW40A13WDX Troubleshooting E 09

CONFIDENTIAL

LW29A13W/LW40A13W 5-1

5 Troubleshooting

Does proper DC 28 V appear at

DC jack connected to CN112?

Check SMPS PCB and Adapter.

Yes

No

Does proper DC 5 V appear

at Pin 1 of IC849 and Pin 2 of

IC828, IC830, IC852?

Check IC849, IC830 and IC828, IC852.

Check IC811 and IC817.

Yes

No

Does proper DC 2.5 V appear at

Pin 2 of IC804, IC806 and IC807?

Check IC804, IC806 and IC807

.

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 12 V appear at

Pin 2 of IC829?

Check IC829.

Yes

No

5-1 No Power

CONFIDENTIAL

5 Troubleshooting

5-2 LW29A13W/LW40A13W

5-2 No Video (PC Analog Signal)

Power indicator is green

Does the signal appear at

Pin 7, 15 and 22 of IC203?

Check the R, G, B signal line and

related the R, G, B signal line.

Yes

No

Does the clock pulse appear at

Pin 30 and 31 of IC203?

Check IC203 and related circuit of IC203.

Yes

No

Does the colck pluse

appear at Pin 4, 10 of IC838?

Check related circuit of IC838.

Yes

No

Replace LCD Panel.