3-1
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
AUDIO ELECTRICAL TROUBLESHOOTING GUIDE
1. POWER (SMPS)
SECTION 3. ELECTRICAL PART
NO
YES
YES
Replace the fuse.
Check the FUSE
F901.
NO
YES
Check BD901,LF901,902.
NO
Check short of P9702 line.
Check short of P9701,P9702 line.
NO
Check short of P9701 line.
NO
Replace IC901,902.
Check
the DC V of C905
if DC V is over
400V.
NO
YES
Check the
DC V of C909,C903,C921
If DC V is in 14~19V
And it is steady
Check IC901,902.
YES
YES
Check the
DC V of C981,C945.
If DC V is 6.1V.
YES
Check the
DC V of C950,C951
If DC V is in
31.68V.
POWER (SMPS)
OK
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