Sounds like its time to retire it....
here is a video on what could it be...
https://www.youtube.com/watch?v=PVOJRWceWp0
Regards
Geoff
SOURCE: Won't heat
Hello,
The Microwave's "Magnetron" is what heats things up. This is true for all Microwave's. The magnetron is normally on the left and sends excited electrons across the interior. Those electrons bounce around inside until their energy is spent.These excited electron 'waves' are slightly larger than the hole openings in the front door glass panel black grid. Usually, when a magnetron goes you would see and hear some popping and witness some arcing inside the interior. However, you may not have been nearby when this happened. Since you heard popping behind the control panel, you probably have electronic failure in the control panel and that failure may have been precipitated by the magnetron or not. In any case, it is very dangerous to disassemble a Microwave and access the magnetron unless you are trained and have been qualified to do this.
With the cost of Microwaves having stabilized and also being quite low compared to 20 years ago, I would take it to a warranty service provider in your area that also sells them, such as Home Depot for example. That way, if it is too costly to repair compared to a replacement cost you can shop for a new one and may even get a discount should you ask them to give you one.
Sorry for the apparent bad news but if you feel this is the answer you're looking for please rate this solution as fixed or helpful. It means a lot to those of us who work for you in the free area instead of for a fee.
You can phone or write this address below for questions regarding your warranty or warranty repairs. Othewise, you can shop online for a replacement at homedepot.com or sears.com
SOURCE: Humming sound, F9 and dead
Seems like I answered this, but maybe it's a different poster.
The 721 model code means it's an LG/Goldstar-made oven and F9 indicates a problem with the inverter or magnetron.
Due to the lethal voltages involved, I do not recommend that a person without training and experience ever work on these models.
I would suggest you contact Sears for service.
We're happy to help you and we'd appreciate your
thoughtful rating of our answer.
SOURCE: LG lmvm1945sw microwave not working.
jesus57 please look here.
TO abadillo
It sounds like you may have spray cleaner or another liquid in the keypad.
I always recommend that users spray the cleaner on a soft cloth (not on the keypad itself) then wipe the control panel off.
Otherwise, the spray can get into the controls and lock it up or make it act odd.
I recommend a soft cloth since paper towels can scratch the plastic.
Also, I always recommend non-ammonia cleaners since ammonia can crack
and damage plastic.
If it does not dry out over time, it may need to be manually dried or blown out with compressed air.
Ideally the control panel (if it's an over the range model) or outer cover (if it's a counter top type) should be removed to aid in the drying.
The keypad may also be damaged and need to be replaced.
If you (or someone you know) might want to replace it yourself, I have uploaded a handy guide with pictures showing you what's typically involved.
You can get Samsung parts here.
If you would like to have us do this for you, we do that for $39.95 plus part costs.
Please feel free to contact me directly if you need more help.
We're happy to help you and we'd appreciate your
thoughtful rating of our answer.
William E. Miller
[email protected]
http://www.microwavedisplay.com
SOURCE: Makes a loud humming sound and blows fuse behind controll panel
Most likely a shorted capacitor is causing the fuse to blow. Easy and cheap to fix.
Check with www.martinmicrowave.com or call toll free 1-877-894-0035 for parts info
SOURCE: microwave not working
faulty relay or solder joint on the power module, but a bad door switch is most common.
Hello friend, thank you for your post!
From what you are describing it sounds like it could be an issue with your capacitor, control panel, or magnetron. I would recommend having a professional come out to properly diagnose and repair your microwave to avoid any unnecessary part purchases. I hope this helps. -Matt
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