The closest diagtam I can find to your model shows 2 fuses.
Inline with L1 and another inline to the heater circuit.
Obviously your L1 fuse blew.
Could not find a amp value for the fuses.
It can't be too high.
Place your amp meter on the compressor circuit and check LRA. If it is near or at top end specs,could be a compressor going bad.
Of course it could have been a main service power surge.
The LG manuals found on Appliancedigest are a great help.
The troubleshooting refers to the main power fuse.
It simply says,No Power....replace the fuse.