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There are 2 more thermostats that can cut power to the entire microwave. The first thermal fuse is mounted up above the microwave cavity and it's called the "cavity thermal fuse". The other thermostat is is mounted to the side of the magnetron behind the control panel area. Below is a link to the thermal fuses since they don't look like fuses. They both look the same so you know what you're looking for. If either part has no continuity, replace it. if they all have continuity, you have a faulty control board and the display board will need to be replaced to resolve the issue.
CLICK HERE to see thermal fuse
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The capacitor should discharge on it's own if it's working properly, but yes you will want to try to discharge the capacitor just in case it's not working properly before servicing the microwave.
Somewhere in the back on the right side
The microwave will need to be pulled out completely to access the magnetron thermal fuse. Those 2 parts at the bottom are not fuses.
Below is your picture and I drew an arrow to the magnetron which is BEHIND the fan so you can't see it.
It's getting late and I must log now but you should have the information you need by now. Good luck to you.
OK so you are correct, that is not the thermal fuse---that is the humidity sensor. The cavity thermal fuse is under the black plastic cover. I attached your second picture and drew an arrow so where you'd need to look for it. You will need to remove the black plastic cover to see it.
Yes. If you're sure the microwave is getting power and both the cavity and magnetron thermal fuse check good as well as the 1" cylinder fuse you checked to start with---the only option left is the display board which can't be tested.
Sure, below is a link to the display board for your microwave.
CLICK HERE for display board