How to remove back of lg LM 1940 DW convection microwave oven to replace fuse
SOURCE: LG Convection Microwave Oven MC-7843D
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.
SOURCE: instruction manual for LG microwave convection oven
You
can download Samsung over the range microwave installation instructions
here. If that's no good, try here.
Otherwise, visit this page, click on click on the left-side arrow "Busque por Codigo del Modelo" in the big purple rectangle, enter your model number in the box, then click "Buscar". They may list an English version manual available for download.
Good luck.
We're happy to help you and we'd appreciate your
thoughtful rating of our answer.
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 OVEN IS MODEL
Hi, ,.//////////
Here is a tip that will help you to figure out what is wrong with your Microwave Oven....
Basic
heatman101
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