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Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Electronic Parts Troubleshooting Guide
: The unit does not operate.
Possible Trouble 1
YES
YES
YES
NO
YES
Is the input voltage
of transformer AC220V?
Is the input voltage
of IC01D DC14V?
Check the FUSE
and the wiring diagram.
Is the output voltage
of IC01D DC12V?
Is the PIN 31,32 of
MICOM. DC5V?
Exchange MICOM
YES
NO
Check the main P.C.B
pattern
NO
NO
Check the D02D~D05D
NO
YES
Exchange
the transformer
Is shorted the
transformer output?
NO
YES
Is the output voltage
of IC02D DC5V?
NO
Exchange IC01D
Exchange IC02D
Is the output voltage
of transformer about AC14V?
Check the
5V P.C.B pattern.
Summary of Contents for LB-E4880HL
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