Question about Panasonic NN-T990SA Microwave Oven

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I have a panasonic NN6453BBPQ model.After 55mins of cooking at high it shut down completely and nothing worked. Changed fuse..still nothing. 5 hours later plugged it back in and now all working fine.any ideas ?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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MicrowaveSvc
  • 9047 Answers

SOURCE: Microwave runs for 3 seconds and shuts off

This is an inverter-driven model, and this is one way the inverter fails. Often it will tick, too, but the cooling fan may be too loud to hear ticking. If you haven't had smoke, then it may not yet catastrophic. I would bet that a thorough resoldering would take care of it. A good technician can troubleshoot and repair this, as needed, but often they will just replace the inverter. Sometimes that's actually cheaper. Troubleshooting an inverter is way too much for someone without good solid technical experience. I would call a shop and ask for an estimate to replace the inverter. Good luck.

Posted on Oct 14, 2006

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MicrowaveSvc
  • 9047 Answers

SOURCE: Panasonic Dimension 4 microwave model

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.

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

Posted on Aug 03, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: Micro Wave shuts down

If it stops after 22 seconds, that means the controller has detected a problem, usually a problem with the inverter or a bad magnetron.

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

You can find an authorized Panasonic servicer here.

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

Posted on Nov 24, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: oven won't heat and shuts down after approx. 20 seconds

If it stops after 22 seconds, that means the controller has detected a problem, usually a problem with the inverter or a bad magnetron.

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

You can find an authorized Panasonic servicer here.


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

Posted on Dec 18, 2008

BIKER T
  • 909 Answers

SOURCE: I have a National Panasonic Genius microwave that

That fault is a little tricky. Need to check if you are getting voltage onto primary of transformer. If you are, the problem is almost certainly the magnatron which has gone open circuit. If and when you replace it, change the cap and HVdiode. Wont be sorry if you do. If no voltage there , your board is faulty. replace it.

Posted on Sep 17, 2009

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Microwave shut off completely


Microwaves have an inline fuse inside that fatigues over time.Take the cover off,follow the power cord after it enters the housing to locate the fuse.

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A wild guess: the scraping noise was a motor bearing seizing up (fan or turntable). A thermal cutout blew when something overheated. This would have taken several minutes to happen.

Alternate, and more likely explanation: the scraping noise was actually high-voltage arcing in a failed component, most probably the voltage doubler capacitor. This would blow the fuse. Replace both the capacitor and diode; the diode was probably overloaded and could fail at any time if it hasn't already. At $5-$10, it's cheap insurance against having to fix the thing twice.

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It sounds like the power relay on the main control is shutting down. To fix this problem you would need to replace the control (Mother board). Before doing that the magnetron (heat element) should be tested to make sure that it is not what caused the relay to fail.

If you send me your model number I can try and get a ball part price on the parts you need.

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It may be that your magnetron is overheating, which will trip the magnetron's thermostat, which will interrupt power until it cools down a few minutes later.

Or it may be a defective magnetron causing electrical interference that disrupts the control circuit.

In order to help you, we need your full model number and some further information.

So please post a NEW question, and please include your brand name and the full model number from the tag in or on the unit, as well as the answers to these questions:

- How long does it cook before it shuts down?

- When it shuts down, does it go completely dead, or does it just stop with the display still lit?

- When you try to cook, do the inside light, turntable, and internal cooling fan all come on?

- Is it making any unusual noise?

- Is it louder or quieter than usual?


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

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In most cases, this is a problem with the inverter or a bad magnetron.

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

I would recommend that you contact your nearest Panasonic-authorized servicer.

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

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