Microwave blew the internal fuse, replaced it and everything works fine until you use the microwave and it blows the fuse again.
This problem is just like my own microwave, replace the shorted HV capacitor
If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.
Here is a link you or someone you know can use to test it, but please read the safety info:
http://www.gallawa.com/microtech/cap_test.html
You can order Panasonic parts from Tritronics here or by calling 866-779-5835, but if you don't find what you're looking for there, try here.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
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it is an NN-H275. it blows the fuse immediately after pressing start.
I have the same problem. In my case we were boiling water on the stove and when we went to microwave some frozen vegetables the microwave went dead as soon as the start button was pushed. There was a lot of condensation under the microwave which could have been on the circuit board as well. I also replaced the fuse and the display will power up and all the lights and fan functions work. But when you try to microwave anything the fuse blows immediately.
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.
Does either situation describe yours?
Do you have the model number?
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