Question about Maytag MMV6178 Convection Microwave Oven

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Maytag MMV6178aaq microwave display not working.

After removal of PCB, noted black spot on upper right corner of display part. Controller appears to work correctly; however, the display is black.

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  • kc66062 Mar 07, 2009

    To verify the connections were attached correctly. All the buttons work, but the display remains black. There is not visual indication to buttons pressed, only audio beeps.

  • William Miller
    William Miller May 11, 2010

    Why did you remove the PCB?

    The black spot in a vacuum fluorescent display tube is supposed to be there. It is a spot formed after the tube is evacuated.

    We
    regularly repair such control units for customers nationwide by mail
    for $39.95 postpaid in about a week with a one-year guarantee.



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  • Maytag Master
  • 8,820 Answers

Well, assuming your connections are good on the board, and you;re getting about 3VAC on the filament leads (outermost two pins), I'd say you would need a new board assembly.

(The VFD tube is not available separately).

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

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

Posted on Mar 10, 2009

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