Question about Frigidaire PLMV168 Microwave Oven

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Rectifier going bad

I have a Frigidaire microwave oven, only had it about 2 years. The rectifier keeps going bad in it. What is causing this to happen?

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Replace the capacitor and diode together as the capacitor is probably failing, causing the diode to fail.

The only other reason the diode could be failing is the magnetron is pulling too much current, but I doubt it.

Posted on Mar 05, 2009


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Microwave keeps blowing fuses after u push start and runs 2-3 seconds

short in the circuit or magnetron take it in for a proper diagnosis but generally it is more expensive to repair than replace

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Panasonic Dimension 4 Microwave- Model NN D801. Whilst microwaving for 2 mins on high - heard a zapping noise. Didnt heat food. Front operating panel works. turntable still works. Any suggestions?

A "zapping noise" usually indicates a problem in the high voltage circuit. If it's an inverter oven, it should have provided you with a fault code. If a non-inverter, the most likely causes are a shorted high voltage rectifier or bad magnetron. But there are many other possible causes.

Oct 02, 2016 | Panasonic Microwave Ovens

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I have a Frigidaire microwave mod:# FMV156DCG. It is about 7 years old. Last week it started tuning itself off. It will run for about a min or 2 then the motor stops but the timer and light stay on. Any...

Possibly is overheating. check all of your vents to make sure that they are not blocked. I have seen some that the vent holes in back were completely covered with lint, because that is where the microwaves pulled the air into the unit to cool the magnetron. If your vents are blocked it cannot pull that air and it will cause a thermostat mounted on the magnetron to over heat and kick it off line. There is also a chance that the thermostat mentioned above is going bad as well. Hope this helps!

Mar 03, 2015 | Frigidaire FMV156DC Microwave Oven

1 Answer

After a power surge, our microwave makes a loud buzzing sound when on, and we also detect a slight odor of burning rubber. what happened?

Hi and welcome to FixYa, I am Kelly
The loud buzzing your hearing is the magnetron oscillator not cycling properly. This is caused most of the time by a failure of either the High Voltage Diode/Rectifier (PN: 5304467670) or the Capacitor (PN: 5304467671)
DO NOT attempt further use as costly damage can occur.

With power off / completely removed and chassis open make sure to hold a screwdriver well back on the handle and ground across the capacitor terminals 3 times. This is to ensure you do not get shocked. Since your unit is malfunctioning I doubt there will be a charge on the capacitor but you have to be safe.

Disconnect the rectifier from the capacitor and read the resistance (ohms) across the 2 terminals. Reverse the meter leads and test it again. It should read resistance in on direction only. If you read open or shorted in both directions the Rectifier is bad. ( I think this is what has failed on your unit)

The capacitor is checked by setting the Ohm Meter on an R x 10,000 scale and probing the teminals. You should see a brief jump in resistance and then the meter drifts to infinity each time you reverse the meter leads. No jump in resistance then the capacitor has failed.
Also read each terminal to the case of the capacitor for shorts. NO shorts allowed. Any short either terminal to ground is cause for replacement. NOTE you may have to remove on set of connecting terminals from one side of the capacitor to get a good reading. Aftoer isolating the capacitor you still have readings to ground or no jump in resistance when the leads are reversed the Capacitor has failed.

The replacement parts are items 1 and 2 of this link:

Thanks for choosing FixYa,

Jul 22, 2011 | Frigidaire FPMV189KF Microwave Ovens

1 Answer

Everything functions on microwave, it just doesn't cook. After pressing cook, the light comes one, the time runs down, just no cooking.

It's possible the magnetron tube, the microwave source, has failed. They can go bad in a couple of ways, and one will cause that symptom (the other causes a loud humming when the oven is trying to cook, but no heat). Other possible causes are bad solder connections or loose terminals on the control board or door switches, or parts in the magnetron's power supply that have failed. If the oven is over 5 years old and has been used often, it's very likely to be the magnetron.

This kind of problem usually needs to be diagnosed while the oven is plugged in and operating. MICROWAVE OVENS USE HAZARDOUS VOLTAGES THAT CAN KILL YOU, so troubleshooting and repair is best left to professionals with the tools and experience to do it safely.

If you want to keep this oven, let a professional check it over and give an estimate. Then you can weigh that against the cost of a new oven; sometimes it's more economical just to replace it.

Jun 12, 2011 | Frigidaire FMV152K Microwave Oven

1 Answer

My microwave makes a loud humm when turned on and does not heat the food. If I put in another mode, Meat, it sounds normal but after a mmin it starts to make the same humm. ???

You most likely have a bad high voltage diode. (Item F1 of link but labeled rectifier)

However... there are two other possibilties those being the High Voltage Capacitor (F2 of link above)
and the Magnetron istelf. (F7 of the link above)

More often than not the diode / rectifier is the problem.

Thanks for using FixYa.


Mar 19, 2010 | Frigidaire PLMV169DC Microwave Oven

1 Answer

No heat from microwave oven

How old is your oven?? If more than 2 years, it may have a bad magnetron tube or other high voltage components. You will need to have it checked by a qualified technician to get an accurate repair estimate that includes everything it needs.

Jan 26, 2008 | Frigidaire PLMV169DC Microwave Oven

2 Answers

How can it come on-but not really?

This is usually a bad door switch or door switch mount.

If it's less than one year old, it's under warranty and you should contact Frigidaire to get it fixed free.

If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and
disassembly information at our site, linked here on Fixya:

We appreciate your thoughtful rating of our answer.

Nov 11, 2007 | Frigidaire FMV156DC Microwave Oven

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