Electrical Troubleshooting Guide; System Power Supply On Smps Board - LG FH2 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. SYSTEM POWER SUPPLY ON SMPS BOARD

No 22 VA
Is the PWR-CTRL(3.3 V)
supplied to D12?
Is the AD/DC OUT(10.5 V-14.8 V)
supplied to C45?
Is Q6 normal?
Is IC8 normal?
Is D10 normal?
Power line of MAIN PCB is short
YES
YES
YES
YES
YES
YES
NO
Check PWR-CTRL of SMPS Board.
NO
Check F1, R6, R8 and replace it.
NO
Check Q6 and replace it.
NO
Check IC8 and replace it.
NO
Check D10 and replace it.
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