Question about Panasonic NN-T990SA Microwave Oven

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1250w panasonic inverter microwave

I went to use my micro this morning, there was no lites, nothing. Checked breaker, it was fine, unplugged and plugged back in, still nothing. I did notice about two weeks ago a sizzling sound for a short time and could'nt see anything that would have caused it. It didn't happen again. I know there is a fuse inside that can be replaced, but the screws  are star shaped with a piece of metal sticking up in the center. Is there a special tool that I have to purchase to take it apart?

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  • Master
  • 473 Answers

Yes these are torx safety bits could be a t-10,t-15, or t-20.  Replace the fuse and see what you get.

Posted on Oct 15, 2007

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  • Panasonic Master
  • 9,098 Answers

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If the unit is running, there's probably no reason to replace the fuse unless it's loose in the holder.

That sizzling is indicative of high voltage or high current. It may be signaling the imminent failue of the inverter.

Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these.

If it happens again, I would recommend that you contact your nearest Panasonic-authorized servicer.

You can find one here:
http://www2.panasonic.com/webapp/wcs/stores/servlet/vServiceLocator?storeId=15001

Posted on Nov 26, 2007

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Posted on Jan 02, 2017

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We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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Was microwaving a hotdog on a paper plate covered by another paper plate and the microwave just kind of went poof and now nothing lites up (display) and it wont work. I checked the breaker it is on and...


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