Electrical Troubleshooting Guide; System Power Supply On Smps Board - LG LHD625 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. SYSTEM POWER SUPPLY ON SMPS BOARD

No 5.5 VA
Is F901 normal?
Is TH901 normal?
Is BD901 normal?
Is the VCC
(11 V ~ 25 V) supplied to IC901
pin7?
Is D952, D953 normal?
Power line of MAIN board is short.
YES
YES
YES
YES
YES
YES
NO
Replace F901 (same fuse).
NO
NO
NO
Check or replace.
NO
Replace D952, D953.
2-38
Replace TH901.
Replace BD901.