Troubleshooting - Samsung LW29A13W Service Manual

5 Troubleshooting

5-1 No Power
Does proper DC 28 V appear at
DC jack connected to CN112?
Yes
Does proper DC 5 V appear
at Pin 1 of IC849 and Pin 2 of
IC828, IC830, IC852?
Yes
Does proper DC 12 V appear at
Pin 2 of IC829?
Yes
Does proper DC 2.5 V appear at
Pin 2 of IC804, IC806 and IC807?
Yes
Does proper DC 3.3 V appear at
Pin 2 of IC800, IC801 and IC805?
Yes
Check IC811 and IC817.
LW29A13W/LW40A13W
No
Check SMPS PCB and Adapter.
No
Check IC849, IC830 and IC828, IC852.
No
Check IC829.
No
Check IC804, IC806 and IC807 .
No
Check IC800, IC801 and IC805.
CONFIDENTIAL
5-1