Question about LG Microwave Ovens
A microwave can be dead for many reasons.
It may be the fuse, which is usually located on the floor of the oven behind the control panel or between the door switches.
If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.
If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.
Then when it cools, it closes the circuit and allows power through again.
When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.
If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.
If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.
If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.
If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.
You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.
If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.
If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.
In some brands there is a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.
We're happy to help and we appreciate your thoughtful rating of our answer.
Posted on Jul 13, 2008
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Posted on Jan 02, 2017
Tips for a great answer:
Mar 04, 2017 | LG Microwave Ovens
May 18, 2016 | LG Microwave Ovens
If you were to log on to the
manufacturer's web site, I think you will be pleasantly surprised as
usually one is able to download, by model number, Customer
Instruction Manuals, list
of Dealers and Driver
Just Google the manufacturer's name and
follow the links. Make certain you are directed to the manufacturer's
web site as some search engines direct you to other sites and they
charge for the information that is normally free of charge.
I hope this helps.
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