Electrical Troubleshooting Guide; Power Supply On Smps Board - LG UBK80 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. POWER SUPPLY ON SMPS BOARD

No 12 VA
(Secondary side)
YES
Is the
VCC supplied to D105
anode?
YES
Is the D105
output 12 VA?
YES
Check soldering
Connector CN103.
NO
Check SMPS primer side.
NO
D105 OK?
CE104, CE105 OK?
3-42
NO
YES
NO
YES
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Check or replace D105.
Check or replace
CE104, CE105.
Only for training and service purposes.