Question about Whirlpool MH1140XMS Microwave Oven

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MH1140XMS Oven Stays On

First of all My father and I broke the light bulb under the microwave away from its screw in base during thanksgiving. I left the light bulb because im lazy. Not sure if this is what caused the problem. 2 months later I am cooking and i see an arc. Not sure what it was i unlugged the microwave and let it sit. I plugged the Microwave back in and it turned on and would stay on if I opened the door. I could smell burnt electronics so instead of replacing it at 300 dollars I decided to order a new controlboard from http://www.appliancepartspros.com ($115) it was here in 2 days. Replaced the controller board last night. Seems a diode had fried ( i could see the burn marks on the underside of the controller card). Installed the new board last night an its working like a champ.

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  • ryancoc22 Feb 11, 2008

    I already fixed it. i just wanted to let everyone know what the symptoms were and how i fixed it.

  • ryancoc22 Feb 12, 2008

    It smoked a diode on the board. can you fix that?

  • William Miller
    William Miller May 11, 2010

    Let me be sure that URL is right:http://www.tinyurl.com/yzjozk

  • William Miller
    William Miller May 11, 2010

    Let me know if you would like the old board repaired. We do that for $39.95 for customers nationwide.

    Our link is on our FixYa profile here:http://tinyurl.com/yzjozk

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  • Whirlpool Master
  • 8,820 Answers

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Right, but I wondered if you might want the OLD broken board fixed, too, as a backup? Keep it in mind, It's only $39.95.

Posted on Feb 11, 2008

  • William Miller
    William Miller Feb 13, 2008

    Sure, we'll replace that, too. It's probably the brightness diode.

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