Samsung PL-42Q91HDP Service Manual page 34

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■ SMPS Troubleshooting
Check the Other board (Image Board or Driver Board) or Cable.
Samsung Electronics
Power ON
Abnormal
STD_5V
Normal
Abnormal
PFC
Normal
Abnormal
VA
Normal
Abnormal
VS
Normal
Check the U101, D108
Check the U201, Q203, Q204
Check the U501
Abnormal
Check the U601
Multi
Check the Q401, Q402
Troubleshooting
4-7

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