Electrical Troubleshooting Guide; Smps Board - LG LHB535 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE
1. SlViPS BOARD
Check the AC
line pattern
Check fuse F901
YES
Check C976
voltage (3.9 V)
YES
NO
NO
NO
Connect the open line
Replace F901
Check BD901 "+"
to "-" pin impedance
Check 3.7 V lines short
Replace PC972, IC902's components
Check SMPS second part lines short
Check MAIN or AMP board short
Replace PC951, PC972, IC901
Check around IC901's components
(Short, Open)
______[ Low impedance:
Replace IC901, BD901
Replace SMPS board _
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