Electronic Parts Troubleshooting Guide - LG LB-E4880HL Service Manual

Electronic Parts Troubleshooting Guide

Possible Trouble 1
Is the input voltage
of transformer AC220V?
YES
Is the output voltage
of transformer about AC14V?
YES
Is the input voltage
of IC01D DC14V?
YES
Is the output voltage
of IC01D DC12V?
YES
Is the output voltage
of IC02D DC5V?
YES
Is the PIN 31,32 of
MICOM. DC5V?
YES
Exchange MICOM
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: The unit does not operate.
NO
Is shorted the
NO
transformer output?
NO
NO
NO
NO
- 31 -
NO
YES
Check the FUSE
and the wiring diagram.
Check the main P.C.B
pattern
Exchange
the transformer
Check the D02D~D05D
Exchange IC01D
Exchange IC02D
Check the
5V P.C.B pattern.
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