Question about LG LMVM1945 Microwave Oven
First off all, I would hope the microwave is on its own breaker, rated at 30A, since the microwave has a fuse rated at 20A.
Normally if the high voltage capacitor is shorted, when you hit the "Start" pad to begin cooking, the fuse will blow instantly.
If you have a problem with the monitor interlock switch, the oven will blow the breaker when the door is closed.
But not always, so it may be a shorted high voltage capacitor, but I would first check for a shorted monitor interlock switch, as well as checking the mounts for all three door switches.
See my help file on door switches here.
Here is a link you or someone you know can use to test the high voltage capacitor, but read their safety warnings first:
The service manual is here, but it does not contain part numbers.
If you need to order parts, contact Encompass here or call them toll-free at 866-779-5835.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Oct 26, 2012
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Posted on Jan 02, 2017
SOURCE: LG microwave oven
It's usually a bad door switch or a broken door switch mount. Once in a while it's due to a board problem. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk
Posted on Jun 15, 2007
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