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Copyright 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
TROUBLESHOOTING GUIDE
1. NO POWER (LED INDICATOR OFF) : [A] Process
Check 15V or
ST_5V of Power B/D.
Fail
Check 15V or
ST_5V of Power B/D.
Check Output of
IC1100(3.3V),
IC1101(1.8V)
Check short of
IC100, Q307.
Pass
Pass
Pass
Pass
Re-soldering of Change
defect part of IC100, Q307.
Change IC1100, IC1101.
Change IC1102
Check Output of
IC1102(10.5V)
Check short of
IC500.
Re-soldering of Change
defect part of IC500,
Change IC1104, IC1105.
Change LED Assy.
Check Output of
IC1104(2.5V)
IC1105(3.3V)
Check LED Assy.
Check P304 Connector.
Check short of
IC100, IC400.
Re-soldering of Change
defect part of IC100, IC400.
Fail
Fail
Fail
Fail
Fail
Fail
Fail
Pass
Pass
Pass
Pass
5V 15V
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