Question about LG MV-1444Y Microwave Oven

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Kenmore galaxy microwave model 721.80002 1500 watts does not heat

Everything else works. won't heat up. sometine makes noise after cook button is pressed. Model appx. 2.5 yrs old. need it for x-mas dinner. please help

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  • concernedad Dec 22, 2008

    When I press start it makes a loud noise like something is trying to connect like a loud buzzing noise, the light comes on and the turntable rotates. The only way you can tell that it is not working is to check the food. The model # is 721.80021000 it is 950 watts not 1500 as I thought earlier.

  • stephs0418 Apr 14, 2009

    microwave wont heat up food

  • William Miller
    William Miller May 11, 2010

    When you hit Start to
    cook, do the inside light and turntable come on?




    Any unusual noises? Is
    it louder or quieter than usual?



    Can you post the full model number?


    A full Sears/Kenmore
    model number has 3 digits, a dot, then 8 more digits, such as
    ###.########



    These answers will help
    me judge whether it's in the high voltage
    section (magnetron, transformer, or diode) or the control section
    (door switch or control board relay or connection).




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  • LG Master
  • 8,820 Answers

With the symptoms you have, I would most strongly suspect a shorted high voltage rectifier diode or a bad magnetron, or a loose and possibly corroded connection on the magnetron's terminal.

The diode is a fairly cheap fix, and the mag will cost more.

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.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

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 22, 2008

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