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WHAT IS PURPOSE OF NOISE FILTER ON VIKING VMOC205

ALL FUNCTIONS PERFORM WELL..WAS TOLD NOISE WAS COMING FROM MAGNETRON SO I REPLACED BUT NOISE (HUM) STILL THERE IN ALL FUNCTIONS. IS THIS A NOISE FILTER PROBLEM???

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  • Viking Master
  • 9,047 Answers

The noise filter is to block electrical noise, not auditory noise. "Noise" in electronics means any unwanted or unintended electrical signal.

The purpose of the noise filter is to help prevent any electrical noise generated in the wiring of the microwave from getting into your house wiring, which could cause interference with or disruption of other devices.

If your microwave is making auditory noise, then it may be a loose cover or panel, a rubber bumper fell off the high voltage transformer, or one of the components is failing.

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the magnetron can be bad without that sound.

If either of those two were bad, it would not cook.

Posted on Oct 31, 2012

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12_17_2012_8_07_27_pm.jpgtypical diode





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If there is no heat at all, but you can hear the magnetron humming, it is probably bad. if there is uneven heat, the wave stirrer that distributes the microwaves around the cooking chamber may be bad. it will heat only one spot unless the wave stirrer is rotating.

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Making a humming noise when turned on and not cooking. I punch in the cooking time I would like and then when it turns on it makes a humming noise and does not cook.


From your description it appears that the Magnetron has failed on your microwave.

*Please be aware*
Replacing the Magnetron in a Microwave is a highly specialist job and should not be carried out by an unqualified person. Microwaves carry lethal levels of voltage even after they have been unplugged from the mains supply. The high voltage circuitry in this area of the oven is extremely dangerous and must undergo a discharging process before work can commence. The Magnetron itself is the main 'engine' of the microwave and operates under extremely high voltages.

For this reason I strongly urge you not to attempt this repair yourself but have it carried out by an electronics repair shop. The cost of this is likely to be prohibitive and you will need to weigh up whether this repair is economically viable or whether you would be better to replace the unit altogether.

Hope this helps. Thanks for using FixYa.

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HI, there are two issues here. the Magnetron tube and the noise filter has failed.

Just to make sure of the Magnetron failure, expose the device and, check the Magnetron temp fuse located near the device. this fuse will show no continuity when tested if faulty. if it testes out ok, replace the magnetron.

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HI, the loud popping noise was the Magnetron tube. this is the main heating device. the noise filter is also damaged and, should be replaced as well.

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When door open the microwave should not work at all, if the turntable and light come on with the door open , if they do , then this is an additional problem with door switch and must be fixed.

Regarding humming noise and no heath, Test the high voltage capacitor, the rectifier diode.or the magnetron.

If it additionally does not spin and no light, then check also the door switch.

The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts. (here in UK).

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Sounds like you just fried your magnetron. Normally when they go bad, they make a very loud noise like what you described. The smell concerns me because you may have ruined the waveguide as well. If the magnetron burns through the protective painted surface of the waveguide, the waveguide is ruined. In most microwave ovens this means replacing the entire unit because the waveguide is not replaceable. Putting a new magnetron in a damaged waveguide will result in the same arcing and eventual failure. In addition to the magnetron, the following components are part of the same high voltage network: HV Transformer HV Diode HV Capacitor Magnetron Thermal Cut-Out Any one of these components could have also been damaged. I DO NOT recommend taking any voltage measurements inside the HV network. Potentials of over 4000 volts can be reached and make it very dangerous for the do-it-yourselfer. Taking resistance readings with the unit unplugged is strongly encouraged. If you decide to pursue a repair, inspect the magnetron tip and inside of the waveguide first. If the magnetron is melted and/or there are burn marks inside the waveguide, a new microwave may be a in order. This actually may be a better option than an expensive repair. I hope you find this advice helpful.

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