Question about GE JVM1490 Convection/Microwave Oven

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GE JVM1490 Microwave Troubleshooting


You responded to my post on the JVM1490. When you say 40V on the secondary are you talking about the LV transformer or the HV transformer?

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Sorry i didn't know you came here but I left a link for the best of tests for your microwave
but here it is again
please be very careful if you have to check the hv transforformer , but these test will help you find the problem , if you get stuck i'll be checking this thread for a few more hours , otherwise we will have to continue tomorrow


Posted on Nov 01, 2008

  • jason Nov 01, 2008

    i also wanted to add if the magnetron was bad the micro would still power and your display would work also.

    and working with the high voltage on that micro will require a special probe to check that hv tx or there is one other way without power

  • jason Nov 01, 2008

    If the main fuse is upstream of the controller, then any short circuit in the microwave generator will also disable the controller and display. If this is the case, then putting in a new fuse will enable the touchpad/display to function but may blow again as soon as a cook cycle is initiated if there is an actual fault in the microwave circuits. Therefore, try a new fuse. If this blows immediately, there may be a short very near the line cord, in the controller, or a defective triac (if your oven uses a triac). Or, even a shorted oven lamp - remove and inspect the light bulb and socket. If it does not blow, initiate a cook cycle (with a cup of water inside). If the oven now works, the fuse may simply have been tired of living. This is common If the fuse still blows immediately, confirm that the controller is operational by unplugging the microwave generator, power relay, and/or triac from the controller. If a new fuse does not now blow when a cook cycle is initiated - and it appears to operate normally - then one of the components in the microwave generator is defective (shorted). See the section: Microwave generator problems.

    Some models have a thermal fuse as well and this may have failed for no reason or a cooling fan may not be working and the oven overheated (in which case it probably would have died while you were cooking something for an important guest - assuming you would use a microwave oven for such a thing!).
    Other possible causes: bad controller power supply or bad controller chip.

    Let me know what you get from these tests




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I hope this helps.

Cindy Wells
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Most likely causes are a blown fuse in HV area of microwave or an open thermal protector or thermal fuse.
Less likely causes are failure of various parts in the HV area.

Due to the lethal dangers inherent in microwaves, servicing of these parts is likely best left to a professional. That said, if you are technically versed I can point you in the direction of some good resources for troubleshooting and repair.

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I'm calling it a day for today.

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