Electrical Troubleshooting Guide; Power Supply On Smps Board - LG CM7420 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. POWER SUPPLY ON SMPS BOARD

No output 5.7 VA
F901 normal?
YES
BD901 normal?
YES
D904 normal?
YES
D933, D937 normal?
YES
Power line of MAIN PCB is short.
NO
Replace F901 (same fuse).
NO
Replace BD901.
NO
Replace D904.
NO
Replace D933, D937.
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