Question about Microwave Ovens

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Microwave keypad has two vertical rows of buttons. the left side work but none of the right side which includes the start button. The unit has not got wet. Circuit board shows no obvious fault. Have reseated the mylar ribbon cable from board to keypad. Seems therefore that no voltage is getting to the right side or there is a fault in the keypad. However to ohm meter check the keypad would neccesitate knowing which buttons are on which of the mylar ribbon lines in order to prove a keypad fault.

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William Miller

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Having the brand and model will help us point you to the parts supplier so you can buy a new keypad.

Please post back.

Posted on Nov 18, 2007

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What is this silver piece in my microwave? what is the result of using the microwave without this piece?


hi..
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Nov 14, 2015 | Black and Decker USA Black & Decker F67e...

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I have an Emerson 900W Microwave MW8999SB and it will randomly assign DEF1 and the rest of the keypad is difficult or not functioning. None of the quick buttons work, and only the 30-second button works....


Pressing the Clear/Pause button works. Sometimes. Most of the time, about a microsecond after pressing Clear/Pause, it goes right back to def1. Most of the time, pressing ANY button doesn't work. Usually takes me 10 to 20 tries to get anything to work. My microwave is about 3 months old. I will never buy Emerson again.

Sep 27, 2013 | Emerson MW8168B Microwave Oven

1 Answer

I wiped my microwave with a wet cloth (too wet may be), as a result the microwave did work one or twice and then it made a strange sound, may be like the sound of a smoke detector, and now no button works!...


If you used too wet a cloth on the keypad, chances are moisture got into the controls.

If it does not dry out over time, it may need to be manually dried or blown out.

The keypad may be damaged or worn out, or control unit may be damaged.

Sep 23, 2013 | Westinghouse WST3504 Microwave Oven

1 Answer

The start button stopped working. Everything else works on my MCD990B.


I think you are right on the money, the keypad control board is vital to the operation of the microwave oven, if the problem cannot be resolved it will require a complete replacement of the above mentioned part, unfortuneately cost should be considered.

Apr 14, 2012 | Magic Chef CHEF9 Microwave Oven

2 Answers

My GE microwave has a Keypad short. Do I have to replace the entire control panel?


Depending on part availability I would recommend the replacement of the keypad "membrane often shorts" but they may offer the control board with it since it ties together.

Mar 14, 2012 | GE Microwave Ovens

1 Answer

Buttons don't work


The first thing I would suggest is a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

If that doesn't work, leave it unplugged for about 5 minutes.

Otherwise, you may have a failed membrane keypad.

If you still need help, please post a new help request to FixYa and include your brand name and full model number.

Feel free to contact me directly (and please remind me of your full model number from the tag on the unit) for more information & help.

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

William E. Miller, AS-EET
[email protected]
http://www.microwavedisplay.com
Microwave Oven Control Panel Repair Nationwide

May 04, 2010 | Magic Chef Microwave Ovens

1 Answer

The start and stop pad just stopped working ,to turn it on i have to press the extra min button and then I get extra min and it starts working.


You have a failing membrane keypad.

To allow us to help you effectively (at no charge), please post a NEW problem to FixYa, and please include your brand name and the full model number from the tag in or on the unit, and mention that you have a failed keypad.

Nov 28, 2009 | Frigidaire Mid-Size Microwave

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Sharp microwave 1200 watts keypad showing


Not a complete answer, but may help describe problem: Our R-510B should be the same except for color, and for several years it has intermittently messed up its display. The left side two segments on the units digit won't light up. So a digit 8, without the two vertical bars on the left, comes out as a letter E reversed left to right. Any digit that uses the two left segments (traditionally labelled segments E and F when talking about 7-segment displays) comes out wrong. Every thing else works fine. I can't tell if this is your problem.
This is almost surely a bad contact at the interface between the LCD display panel and the PC board: Typically there is a "squishy" conductive strip that connects them, and I expect grease has gotten in there. If so careful disassembly and cleaning with a mild solvent should fix it. Since we can live with it, and it usually fixes itself in a few weeks, I have not got around to taking it apart.
Bob Wilson

Oct 24, 2009 | Sharp R-510HW Microwave Oven

1 Answer

Start button on microwave does not work


Some numbers are missing off that model number. Would that be model 721.62622200?

(If not, please reply back with the correct model number off the tag)

If it's cooking with the programmed buttons, but Start is not working, it sounds like the keypad has failed.

The keypad for model number 721.62622200 is no longer available as a separate part.

So you'd have to buy the entire controller assembly, which includes the plastic frame, keypad, and circuit board, etc.

It is part # 4781W1M307A and it runs $110.10 at the Sears parts Web site.

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

Jul 17, 2008 | Kenmore 62622 Microwave Oven

1 Answer

At times some butons don't work


You may have a bad keypad, which in many cases can be replaced.

 

A bad keypad may be worn out due to age, damaged, or it may have gotten wet or otherwise contaminated.

 

Moisture and contamination can be caused by not using the fan when boiling on the stove top (for over the range models), direct spraying of cleaners, by storing the microwave in an unheated garage or shed, or infestation.

 

I warn my customers to never spray cleaner directly onto the microwave keypad, since the liquid can get inside and "lock up" or even ruin the keypad or controller.

 

You can find helpful exploded view diagrams and order parts by entering your model number here: http://tinyurl.com/gv383

Aug 10, 2007 | Hotpoint RVM1425 Microwave Oven

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