Section; Hdr Part; Electrical Troubleshooting Guide; Power ( Smps ) Circuit (Part 1) - LG RH4820W Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. Power ( SMPS ) Circuit (Part 1)

No VF+
Is 5.2VA section working?
YES
Check R102
YES
Replace R102

HDR PART

NO
YES
No 5.2VA
YES
Check F101
YES
Is there a DC voltage at
TH01?
YES
Is there a DC voltage
At (+) terminal of BD101?
YES
Replace IC101
3-2
No 5VD
NO
Is 5.2VA section working?
YES
NO
Is 5.2V present at
emitter of Q120?
YES
Replace Q120
NO
Replace TH01
NO
Replace BD101