Hi,
Sorry to hear your having problems with your microwave.
There are more than one fuse so the idea is to find which one [ if any] are bad / good.
Turn the unit upside down and remove all screws holding the cover on.
Look for the fuses that will very close to this diagram if not exactly. Just do not short out the transformer even unplugged for days this can give you a nasty shock and more.
Here you go and best of luck 
Rice
Hi,
Thank you for contacting Fixya.com.
Besides the regular fuse your microwave has two thermal fuses - one is attached to the magnetron tube (called the magnetron Thermal Cut Off or TCO) and the cavity TCO (usually located under the air ducts on the left side of the microwave). If you have the wiring diagram (usually supplied with the microwave) you can find them there. Unfortunately the model number you provided I'm not able to find the wiring diagram for your microwave
Please accept the solution if it has helped you with your issue.
SOURCE: How do I replace a LG LMV1630ST microwave oven door handle?
Normally
you have to separate the door panels (as shown in the attached photo)
and then you'll see the screws you need to remove.
Or you can watch a YouTube video (not a video I made) here that demonstrates how it's done.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer. 
SOURCE: My LG microwave went completely dead. I is only 3
under the outer cover,its either a 10-15-or 20 amp ceramic safety fuse avail at most hardware stores, the amp rating is on the side of the fuse, if the new one blows then either the H.V. diode/capacitor or the magnetron can be suspects
It sounds like the magnetron may have
either failed or is not being supplied with the extremely high
voltage required to run it.
YOUR
SAFETY IS PARAMOUNT
This is a job for a professional but if
you are safety clued up, here's instruction.
Make sure the !!!!any
capacitors are discharged!!!!! before attempting any sort of
repair.
Check the door interlock switches first then the high
voltage diode with either an AVO model 8 or moving coil meter on high
resistance range for short circuit, (DVM's won't show the fault!),
the capacitor can fail and go short circuit, the feed fuse on the
primary of the high voltage transformer and then finally, the
magnetron is best checked by substitution.
Hope that helps.
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Silly question. Where is the regular fuse and how do I remove it?
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