Question about Frigidaire Model PLMVZ169GC Microwave Oven

1 Answer

My microwave suddenly stopped working, indicated by not lights on the control panel display. I replaced the line fuse and the display lit up. When trying to start the microwave, the fuse immediately blew again. I've tested all 3 door switches, the magnetron fuse, both thermostat switches, capacitor and all appear to be functioning correctly. I noticed a burn mark on the control board around (what I think is) one of the resistors. Could this be making my line fuse blow upon starting?

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  • Mitch Niedrach Nov 07, 2012

    Image of the control board burn around resistor

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  • Master
  • 14,553 Answers

Yes, that appears to be the inverter board that is for power for the magnetron.

NOTE: if that inverter is burnt the Magnetron may be bad.
My microwave suddenly stopped working, i - 11_8_2012_5_25_57_pm.jpgtypical Magnetron.

Posted on Nov 08, 2012

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

MicrowaveSvc
  • 9047 Answers

SOURCE: Microwave with load buzz and not heating.

With the symptoms you have, I would most strongly suspect a shorted high voltage rectifier diode or a bad magnetron.

It may be a problem with the transformer, but I suspect that less.

The diode is a fairly cheap fix, and the mag will cost more. The transformer may be pretty steep. But it's best to take it a step at a time.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

If you don't find yours, or if you want to look at it without disassembling the oven, you can download it here.

Here are some links you or someone you know can use for test help, but read their safety warnings first:

http://www.gallawa.com/microtech/diode.html
(if it's not shorted, it's probably okay)

http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html

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

Posted on Dec 15, 2008

ginko
  • 19396 Answers

SOURCE: MICROWAVE NOT HEATING ANYTHING?


If it is working but not heating, then test the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.

The diodeand capacitors can be tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, evenif power is off.Capacitors can get discharged by shorting their two contacts.
Before replacing the magnetron test also the control board.
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.

You can also order from MicrowaveSvc , they also provide parts.

Posted on Apr 27, 2009

  • 561 Answers

SOURCE: microwave does not work unti, door slightly

this may not be the switch its self but its physical position in relation to the door acuator. either the switch needs adjustment or the door actuator or door itself. recommend certifed engineer advise on this problem.

warning: mircowave is a high energy, if doors are not seated correcly then energy may leak past door shielding and cause injury.

Posted on Nov 13, 2009

MicrowaveSvc
  • 9047 Answers

SOURCE: Servicer with a PLMV169DCD Fuse blowing Problem

For future reference, we regularly repair such control boards and displays for customers nationwide by mail for $39.95 postpaid in about a week or so with a one-year guarantee.

Here's the main service manual. Other versions are here and here.

It may be grease inside one of the switches or arcing conductors (usually due to opening the door while it's cooking) making it sticky.

This was made by Sharp, so the side panel should come off each interlock switch for inspection.

But looking at the schematic, the monitor switch cannot come into play under normal circumstances unless the door is shut and the secondary interlock (relay RY2 on the control board) is closed and (oddly, if the published schematic is to be believed) if the oven lamp relay RY1 is closed .

Everything seems to point to a bizarre problem like maybe an intermittent short of a wire to the chassis, perhaps where a wire passes through a hole or guide in the sheet metal.

Also, you might consider unplugging the hood vent motor and trying it.

Did you try it with the oven powered from another outlet?

Also be sure the neutral and hot are not reversed at the outlet and that the line voltage is correct.

Sometimes a loose neutral can be a factor. Test outlets in several area of the house to see if some are high and some are low. This can be dangerous, and the power company must be called.

If there is anything else on the same breaker, that can be a factor.

Good luck!

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

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

Posted on Nov 29, 2009

  • 72 Answers

SOURCE: My Frigidaire microwave (PLMV169DCD) has recently

A used magnetron is not a good idea at all to try and you can not test a diode with a digital meter. 99.9% of the time your transformer will start burning the wire windings when it fails. Also a magnetron can test good and still be bad. Without being there and looking at this myself the best advise I can give is to check the door switches, and if they are good just replace the Magnetron and Diode. You can order reasonably priced microwave replacement parts here http://allapplianceparts.com/. The mags they sell are better than most oem ones and are cheaper! You can also pick out a replacement diode from them.

Posted on Nov 23, 2010

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