LG AB-H1208VA0 Service Manual page 23

Electronic parts Troubleshooting Guide
Possible trouble 8
Is the unit operating?
YES
Is the output
voltage of Micom's 10PIN on
the MAIN PCB 5V?
YES
Is the voltage
between 1PIN of CN8 and
NEUTRAL 220V?
YES
Is the "Power relay" for
indoor motor OK?
YES
Check the indoor motor.
Possible trouble 9
Is it cooling operation?
YES
Is the compressor operating?
YES
1. Check wiring for outdoor
motor and magnetic contactor.
2. Check outdoor motor & capacitor.
: Indoor motor does not operate.
NO
NO
NO
NO
: Outdoor motor does not operate.
NO
NO
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1. Press power ON/OFF button.
2. Reconnect the power supply.
1. Check or exchange IC01D,
IC02D on the main PCB.
1. Check or exchange RY10.
1. Check the wiring of
"Power relay".
2. Exchange "Power relay".
1. Press power "ON/OFF" button.
2. Select cooling operation.
1. Set following.
Set temp. < Room temp.
2. Wait, if the unit has operating
with 3-minute time delay.