Question about GE JVM1640 Microwave Oven

1 Answer

No heat - where is the diode

JVM1640AB002 mfg Feb 2000, kw= 1.58 SN DZ996205S This failed with a single buzz arcing noise (buuzzzzz-IT-ARC...SNAP! sound) similar to having a piece of metal arcing in the cooking area - but no arcing in the cooking area and no metal. It arced three times, once when it failed heating, twice after a restart, each time, no heat. Now no arcing or heat. No popped circuit breakers, just does not heat. Everything else works, display, fans, lights, turntable. I have tested the door switches, they function correctly. Reseated the connector on the magnetron, checked for broken insulation on wires, tapped the on board relays a few times Where can I get a schematic to locate the HV diode and check it before I locate a new magnetron? Or, is it even worth getting a new Magnetron? I mean, these are running for about $200-$300 retail. Thanks!

Posted by on

  • 4 more comments 
  • gamerrell Aug 24, 2007

    I found the diode, and the price for the magnetron with new diode is $150 online.

    So I'll test the diode and if bad, look for the part number because that sucker with a piece of shrink wrap, a ring lug and spade lug is $50 ! Crazy ...

  • gamerrell Aug 24, 2007

    Gee, the buzzzzz-IT_ARC ... SNAP was probably the diode that had shorted then opened. If functioning properly, it was acting just like a fuse.
    The diode is an HVR-1X3 High Voltage Diode. $0.79 from most electronic dealers, $5.00 with the ring and spade crimped on as Microwave Ovens and TV's commonly use these.

    And Appliance dealers charge $50!!

  • gamerrell Aug 24, 2007

    With the help of this site, and, all tests are complete, HV xfmr is fine, magnetron preliminary checks okay, capacitor okay, door switches all check out.
    So it looks like the cost of the repair will be less than $5.00 and an hour of labor on a $300 appliance.

  • gamerrell Sep 28, 2007

    Actually when testing the diode, you need to use a megohm meter. You can not test a HV diode using a standard meter.
    The diode was good after testing with a megger, HV Transformer supplied a nice arc and filament voltage, so the last thing in the basket was indeed a bad magnetron.
    Magnetrons can be had for about $51 if you simple Google the part number on the Magnetron. This means some appliance stores are marking up parts in some cases 200%, with the more reputable appliance guys only marking up 25% which is a bargan considering they give phone time advice for free.
    Magnetron replaced for $69, all is well.

  • Anonymous Mar 26, 2014


  • Anonymous Apr 01, 2014

    Two Microwaves at work failed at the same day. The keypad/display works on both units but neither unit will heat food. I took the cover off of one unit and tested the
    hv diode, the capacitor, the door switches and the heat sensor on top. All were good. I visually inspected the Magnetron and it appears ok. No cracked magnets or burned insulators.
    Anything else I can check?




1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • GE Master
  • 9,098 Answers

Sorry to answer so late in the game, but in case others have this problem, you can find helpful exploded view diagrams and order parts by entering your model number here:

Posted on Sep 28, 2007


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Samsong microvave does not heat, increase buzzing noise

You may have failing magnetron or shorted high voltage diode, but on some models, it is a failing capacitor on the controller.

We would need to know the full model number from the tag in the cooking cavity or elsewhere on the microwave, such as the door frame, controller frame, etc.

Please post a new help request with that and more detailed symptoms.

Apr 15, 2013 | Microwave Ovens

1 Answer


The magnetron is getting to hot and will eventually fail, especially when it is arcing, "a safety issue convern" the cause is the part mentioned above, or there is exposed metal on the inside cavity.

May 07, 2012 | Maytag 1.6 Cu. Ft. Over-the-Range...

1 Answer

Roommate steamed up the spacemaker by hard boiling pot of soup without running the fan. Then microwaved a cup of coffee while the steamed condition was still present. An arc sparked from the vent above...

Sounds like a problem in the high voltage side. Need to check the diode and if good the voltage at the magnetron. Should be 3.5 volts across mag and 4500 dc volts at mag. If you do not have a meter to check replace both mag and diode aprox $150.00 from GE. Pat

Dec 03, 2010 | GE Microwave Ovens

1 Answer

Microwave won't heat, light ,clock works the microwave just won't heat the items in it.

when a microwave quits heating but every thing else is ok normally
investigate these 4 areas

Investigate these three areas if your microwave won't heat but you hear a loud buzzing or humming noise:
microwave_diode.jpg Power Diode

A diode is an electronic component that readily passes current in one direction only and blocks the flow of current in the opposing direction. If your microwave's diode has become defective, your microwave will not heat and you will hear a buzzing noise. Test the diode to determine if this is the cause of your problem. Replace it if it is defective.

picturena.gif High Voltage Capacitor

A capacitor is an electrical device which stores electricity. A defective capacitor may be why your microwave is not heating but you are hearing a buzzing or humming noise. The capacitor will have to be tested to determine if this is the cause of your problem. A defective capacitor will have to be replaced before your microwave will work again. Make sure you discharge the capacitor before you test it, though.

microwave_magnetron.jpg Magnetron

A defective magnetron is the third possible cause of why your microwave is not heating, but you can hear a buzzing noise. Test your microwave's magnetron. Replace it if it is defective.

Nov 09, 2010 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Started arcing inside like it was on fire. It started to arc inside and making a loud noise. You could see big flashes coming from inside where the motor is. It did'nt last very long. I wont be buying...

When the micro starts arcing it is reasonably serious. One or more of the components are broken down. What needs to be done is firstly, "pull the plug out" The cover needs to be unscrewed and removed. You will then see the electrical components on the R.H.Side. There is a magnatron (creates the heat).and a capacitor (discharge voltage) and a HV diode. (DCcurrent to charge the cap). The magnatron needs to be replaced, and the HV diode. Please do not do it yourself as there are lethel voltages sitting there waiting for a wrong move. A technician needs to do the repairs as he has the appropriate tools to discharge the cap and do relative tests.

Aug 29, 2010 | Emerson Fans Emerson MW8115SS Microwave...

1 Answer

Panasonic Microwave NNSD277B 5yrs old makes noise after 20sec on (bUzzing and popping)and internal light flashes. Should be replaced or fixed ? what could be the problem?

You should have no arcing within the unit. Assuming you have adequate food/water in the cavity, it should not arc. You NEVER run the unit without something to be heated in it!!!

You might check the stirrer fan which is often in the roof of the unit to see if contamination might be in the area causing arcing. The electric fields in th area are very high and arcs can jump.

If the insulating window is charred or has charred grease, it should bbe replaced.

Dec 26, 2009 | Panasonic Microwave Ovens

1 Answer

Microwave making loud buzzing sound when operated, sounds like something is about to pop.

could be several possible components at fault. how old is it ? does the unit heat ? if so, could be a hi voltage diode, or a hi voltage tranformer. (older frigidaire m'w's had trans. that would crackle and "arc" when bad) it is not the mag though, it wouldn't heat if so.

Sep 25, 2009 | Microwave Ovens

1 Answer

Microwave made loud popping sound and now does not heat.

Try this
Probably a high voltage diode popped because contaminated grease eventually built up and made a path for a high voltsge arc to occur.. To confirm,take the outer cover off the microwave and discharge the high voltage capacitor by shorting its terminals. Then pull the plug off the magnetron side and place it near the magnetron socket. Now turn the microwave on and push the connector on the magnetron with a chopstick or a long insulated screwdriver. If no arc when you do this this confirms a bad diode.

please rate my suggestion..

Apr 13, 2009 | Kenmore 62702 Microwave Oven

1 Answer

Kenmore 721.80524500 makes a buzzing, grinding noise

Your problem is due to the "magnetron" arcing to the wave guide within the microwave. Picture someone arc-welding stuff together inside the microwave casing, that's essentially what's happening. It is a fire hazard and you should stop using the microwave immediately. As far as I know, there isn't a recall on that particular model (though there was on another similar Kenmore/Whirlpool model) so if it's out of warranty, you're out of luck.

Sep 08, 2008 | Kenmore 63662 / 63664 / 63669 Microwave...

1 Answer

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

Dec 07, 2007 | Kenmore 62622 Microwave Oven

Not finding what you are looking for?
GE JVM1640 Microwave Oven Logo

839 people viewed this question

Ask a Question

Usually answered in minutes!

Top GE Microwave Ovens Experts

William Miller
William Miller

Level 3 Expert

9098 Answers


Level 2 Expert

225 Answers


Level 3 Expert

1175 Answers

Are you a GE Microwave Oven Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides