Power Supply On Main Board - LG LHD625 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

2. POWER SUPPLY ON MAIN BOARD

No 3.3 V
Is the VCC supplied
to IC105 pin3?
Is there signal
at IC105 pin2?
Check IC105 and replace.
No 3.3 VA
Is the VCC supplied
to IC103 pin1?
Check IC103 and replace.
YES
YES
YES
YES
YES
NO
Check 5.5 VA on SMPS board.
NO
Check IC108 pin23 (P_CTRL).
NO
Check 5.5 VA on SMPS board.
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