Electrical Troubleshooting Guide; Power Check Flow - LG DK7711PM Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. Power check flow

A.
No VF+
Is 5.2VA section working?
YES
Check F102
YES
Replace D109.
NO
No 5.2VA.
Check F101
Is there a DC voltage at
R101?
NO
Is there a DC voltage At
(+) terminal of BD101?
YES
Replace IC101.
3-2
B.
No 5V_A .
NO
Is 5.2VA section working?
YES
NO
Is 5.2V present at emitter
of Q107?
YES
Replace Q107.
YES
NO
Replace R101.
YES
NO
Replace BD101.