LG TN-C090BT00 Service Manual page 21

Electronic parts Troubleshooting Guide
Possible trouble 5
Is the unit operating?
YES
Is the cooling mode?
YES
Set Temp. < Room Temp.?
YES
Is the output
voltage of Micom's 4PIN on the
MAIN PCB DC0V?
YES
Is the voltage
between 1PIN of CN-COMP and
NEUTRAL 220V?
YES
Is the magnetic contactor
for compressor OK?
YES
1. Check Compressor and
Capacitor for Compressor.
NOTE: 3 model has not capacitor for compressor.
: No cooling operation performed.
NO
NO
NO
NO
NO
NO
21
1. Press power ON/OFF button.
1. Press cooling operation key.
2. After reenergizing power supply,
press power "ON/OFF" button.
1. Set flowing.
'Set Temp. < Room Temp.'
1. Check or exchange IC02D.
2. Check 3-minutes time delay.
1. Check or exchange RY4.
1. Check the wiring of Magnetic
contactor.
2. Exchange Magnetic contactor.