WHAT IS PURPOSE OF NOISE FILTER ON VIKING VMOC205

If your microwave is making an unusual or loud humming noise, you may have a problem with the magnetron. This component is part of the high voltage circuit and provides the microwaves that generate the heat. If the magnetron is defective, it may cause a loud humming or buzzing noise

Excessive 60 cycle hum/vibration means a bad Magnetron. Time to replace the unit.

May as well use the microwave as is until it terminates naturally. All microwave ovens buzz, that nothing unusual, but although you can replace a Magnetron, the cost is unusually high. By the time you take the oven down, open the case and fuss around, perhaps not making things any better; the fact is; a new replacement with a warranty is just over $100. Why bother?

Good possibility your start capacitor is leaking. When it goes completely it will blow fuse or circuit breaker causing a dead condition. You can get and replace this yourself but be careful to discharge the capacitor with a set of test leads across the terminals. This part can hold dangerous voltage! Of course, unplug the unit first. The magnetron is expensive if you can even get one. For the cost of most new units, this may be too much unless it’s a over the stove model.

Mine having same prob but now fan not coming on either

If its making a humming noise, that means the diode is bad and should be replaced. Once replaced the microwave will begin to heat again.

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.

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.

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.

In conclusion, replacing the Magnetron tube and noise filter will fix this unit.

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.