Electronic Parts Troubleshooting Guide - LG AP-Z Series Svc Manual

Electronic Parts Troubleshooting Guide

Electronic Parts Troubleshooting Guide
1) No Cooling operation performed
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 IC03D DC5V?
YES
Is the PIN 55,64 of
MICOM. DC5V?
YES
Exchange MICOM
Possible Trouble 2
Is IC03M operated
normally?
YES
Is the each Relay
any problem?
NO
Check the fan motor
and connector.
(CN-MOTOR)
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Only for training and service purposes
: The unit does not operate.
NO
Is shorted the
NO
transformer output?
YES
NO
NO
NO
NO
: The indoor fan does not operate.
NO
YES
Check the FUSE
and the wiring diagram.
Check the main P.C.B
NO
pattern
Exchange
the transformer
Check the D02D~D05D
Exchange IC01D
Exchange IC03D
Check the
5V P.C.B pattern.
Exchange IC03M
Exchange Relay
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LGE Internal Use Only