Question about Panasonic NN-H965 Microwave Oven

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My microwave is making a high pitch sound about 5 seconds in. It eventually stops but, is this dangerous?

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Posted on Jan 02, 2017

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MicrowaveSvc
  • 9085 Answers

SOURCE: NN-T990SA Panasonic Microwave Stopped Heating

This model uses an inverter to produce high voltage instead of a convential transformer system. While an inverter (switched-mode power supply) is more efficient from a power consumption standpoint, it is more complex, thus more statistically prone to fail. These should only be examined and worked on by someone who has the necessary technical qualifications. Seriously. Often the machine-soldered connections in a microwave inverter are too weak, so they eventually fail, especially if heat is high in the area. They sometimes fail catastrophically. When not catastrophically damaged, you may hear clicking or squealing and may smell an electrical odor, which is sometimes obscured by the cooling fan. Some manufacturers do not encourage or assist technicians to repair microwave inverters. Most offer the inverter as a whole assembly. But sometimes that is actually cheaper than the time and labor required to fix the old one. If a technician is willing and able to troubleshoot and repair the inverter to component level, it will may be expensive, but may be worth it, especially if he or she will resolder and reinforce connections as needed as part of a thorough repair. That could easily make your inverter beter than a new one! You might be able to get some verbal estimates if you call Panasonic-authorized repair shops and ask then specifically about inverter repair and inverter replacement costs for your model number.

Posted on Dec 23, 2006

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MicrowaveSvc
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SOURCE: microwave turns off after 4 seconds

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. You can find one here

We're happy to help and we appreciate your thoughtful rating of our answer.

(Please don't kill the messenger!) *grin*

Posted on May 27, 2008

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1 Answer

How to reset my GE over the stove microwave model # JVM140K003


There is no 'reset' on a microwave apart from turning the power off, counting to 10 and plugging it back in.

Also, because they are so dangerous, you can't repair them yourself. There are massive voltages, dangerous radiation that can make you blind in three to 5 seconds, and a highly poisonous compound in the magnetron. For that reason, they have security screws on them. Take it to a repair centre.

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Sounds like a bad capacitor. Careful, they hold a big charge long after being turned off. They are usually not too expensive. Bad ones will bulge at the top or bottom, leak.

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GE Microwave (JVM1860CD001) control board buzzes.


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Magnetron If the microwave is loud or noisy only when cooking, the magnetron tube might be defective. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. Under normal circumstances the magnetron is nearly silent. However if it is damaged or nearly burned out it can begin emitting high pitched or growling noises. It's not normally dangerous to use a microwave oven when it makes these noises, but they are an indication that the magnetron is almost dead and will need to be replaced.
Exhaust Fan Motor If the microwave is loud when running the fan motor might be
Stirrer Motor If the microwave is loud or noisy the stirrer motor might be worn out. The stirrer is a metal blade which slowly turns around, deflecting the microwave energy in a random pattern inside the microwave oven. As the motor nears the end of its useful life it begins to make grinding noises. The microwave will not heat food evenly without this stirrer, the motor should be replaced.
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2 Answers

Microwave turns off after 4 seconds


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. You can find one here

We're happy to help and we appreciate your thoughtful rating of our answer.

(Please don't kill the messenger!) *grin*

May 15, 2008 | Panasonic NN-S560WF Microwave Oven

1 Answer

Works - but the sound has changed


Possibly, the "fault" was the buzzing in the first place! Buzzing is usually a cabinet vibration caused by magnetic fields from the "gubbins". If the buzzing should occur again, try pushing/ pulling/ poking the cabinet while the oven is running, you may find a position that causes the buzz to stop.
Another possibility is you previously had something else placed in close proximity to the oven.
If a rattling cabinet is the problem, either try to reposition something, or just ignore it!

Apr 29, 2008 | Maytag MMV4205 Microwave Oven

1 Answer

Microwave is not heating. We have pulled plug several times to attempt to re-set it. This worked twice and now we have no use of our microwave.


if the microwave sounds like it is working but not heating, it could be a loose wire on the magnetron tube or the high voltage capacitor. if there is an abnormal low pitch hum, it could be a shorted capacitor, diode, or magnetron tube. Either way, diagnosis and repair is best made by a qualified servicer.
There are dangerous voltages present with all microwave ovens,
even when they are unplugged.

Mar 27, 2008 | Microwave Ovens

1 Answer

Louder than normal noise when using and bad 'burning' smell


You need to stop using your microwave if it's burning. This is a common symptom of a blown magnetron. Using it in it's current condition is not only dangerous, but it will further damage other components in the high voltage circuit and/or waveguide. In many circumstances, damaging the waveguide renders a microwave non-repairable. A new magnetron will cost you around $100 if you wish to repair this yourself. NOTE: I would not recommend working in or around the high voltage circuitry unless you absolutely know what you are doing. Do not attempt to take any live voltage measurements or operate the oven with any of the protective covers removed or interlocks defeated. Voltage potentials of over 13,000 volts exist and are potentially dangerous. I hope this helps you.

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Kenmore 721.63662300, 1200W


The magnatron is shorting and overloading the high voltage transformer which is complaining with a load noise. Worth fixing if you do it your self. Magnatrons cast about $40 wholesale. There are just a few varieties of them that fit almos all brands. Try www.partstap.com

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NN-T990SA Panasonic Microwave Stopped Heating


This model uses an inverter to produce high voltage instead of a convential transformer system. While an inverter (switched-mode power supply) is more efficient from a power consumption standpoint, it is more complex, thus more statistically prone to fail. These should only be examined and worked on by someone who has the necessary technical qualifications. Seriously. Often the machine-soldered connections in a microwave inverter are too weak, so they eventually fail, especially if heat is high in the area. They sometimes fail catastrophically. When not catastrophically damaged, you may hear clicking or squealing and may smell an electrical odor, which is sometimes obscured by the cooling fan. Some manufacturers do not encourage or assist technicians to repair microwave inverters. Most offer the inverter as a whole assembly. But sometimes that is actually cheaper than the time and labor required to fix the old one. If a technician is willing and able to troubleshoot and repair the inverter to component level, it will may be expensive, but may be worth it, especially if he or she will resolder and reinforce connections as needed as part of a thorough repair. That could easily make your inverter beter than a new one! You might be able to get some verbal estimates if you call Panasonic-authorized repair shops and ask then specifically about inverter repair and inverter replacement costs for your model number.

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1 Answer

High pitched hum/buzz


By high-pitched, you mean it is not that same frequency as when it's cooking? Is the tone near or the same as the beep you hear when you press a key? Please post a little more information so we can help better.

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