LG LMC1575BD Service Manual page 37

Inverter wiring check.
1
3
① High voltage wire
: IInverter supply high voltage
and current to Magnetron
though this wire
② Inverter earth wire
: If earth is loose or not fixed,
inverter work not correctly and
make current leakage.
Make sure earth wire fix
correctly after change inverter
2
PCB.
4
5
5-25
③, ⑤ Communication wire connector
: If this wire is not connect exactly,
it make F-11 Error code.
④ AC power connector
: If this wire is not connect exactly,
it make F-13,14 and 15 Error code.