Anything added to the circuit the microwave is on? Circuit could be overloaded.
You could have a shorted high voltage rectifier, high voltage capacitor, or shorted magnetron. Usually a door switch problem blows the internal fuse in the oven, but door switches should be checked anyway.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/david_29ad5d1dd86564b0
More than likely the klystron tube is defective, that draws a lot of current. Best path here is a new MW
SOURCE: Nothing happens when you press "Start"
PLEASE CHECK IF DOOR IS CLOSED PROPERLY THOSE HOOKS ON THE DOOR ACTIVATE SWITCHES ON THE INSIDE OF MWAVE OPEN COVER AND CHECK IF HOOKS ARE MAKING CONTACT WITH SWITCHES .COULD ALSO BE TOUCHPAD FAULT YOU WILNEED A TECH
SOURCE: Microwave blows fuse
The most common suspects are the high voltage transformer and the magnetron. It's also possible you have a flaky door switch or loose door switch mount. 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 You can find helpful exploded view diagrams and order parts by entering your model number here: http://tinyurl.com/gv383
SOURCE: Microwave quit working
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.
It may also be the high-voltage rectifier diode.
If you or a friend decide to look into it, we have critical safety information and disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk
Feel free to post your brand and model so we might be able to give me specific info.
SOURCE: LG microwave model MV1526B
The pop leads me to suspect that the high voltage rectifier diode blew.
We have the service manual for this model and have uploaded it to our site here to help you. You will need the free Adobe Reader to view or print it.
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 (or GFI) 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.
There
should also be 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.
You can usually find helpful exploded view diagrams and order parts by entering your full model number here.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
SOURCE: Power went out. Microwave just scrolls press clock!!!!!!!!!
Did you figure this out? I am having the same problem. I see PRESS CLOCK on the control display. But none of the keys on the touch pad work. GE sucks bigtime !!
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