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Kenmore microwave/hood some touch pad keys work

Model 721.80043700 random touch pad keys work and others don't. do i need to replace the circuit board and touch pad? the ribbon connection to the touchpad smells burnt but no visible charring. the cleaners may have used a spray cleaner to the door and screen. any help would be appreciated.

thanks steve

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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MicrowaveSvc
  • 9047 Answers

SOURCE: kenmore microwave model 721.62644200

We see this a lot. The problem is on the control panel, which we regularly repair nationwide for $39.95 postpaid.

This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.

This can often also affect the exhaust fan operation, too. The lights and fan can be inoperable or stuck on too.

Details of our service and critical safety information and disassembly information is at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

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

Posted on Jan 20, 2008

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sharcnet
  • 2130 Answers

SOURCE: My Touch pad does not work, can someone help?

It sounds like the keypad is worn out. The fact that you can get them to work sometimes by what direction you push on them, tells me that the contacts are not working correctly.

Did you have this problem prior to the fuse blowing or did it start after you replaced the fuse?

I don't believe the fuse blowing is related to the keypad problem. I also don't believe that you have a microprocessor problem because you say that the function buttons work but the number keys don't work right. If the microprocessor was faulty, it would not be able to read any of the keys.

The fact that the number keys are not working doesn't surprise me. When you go to cook something, you will press the number keys several times, while only pressing start or stop once. This is why your number keys have worn out first. These keys have a limited number of cycles (presses) and it sounds like its time for a new keypad.

Please let me know if I can be of further assistance to you.

Good Luck!

- Jim

Posted on Feb 21, 2008

SOURCE: kenmore elite microwave touch screen stopped working

Same thing happened to us. We just came back from Sears, where we bought another. Just for giggles, my wife suggested unplugging the old one and plugging it back in again. It works now. New one's going back to the store.

Posted on Aug 16, 2008

jmgldsmth
  • 1869 Answers

SOURCE: Kenmore over the range microwave 721.63684300 - nothing works

you must remove the MW take off the cover then look for a large metal can (capacitor) and a white (ceramic) fuse...look and, smell and, you should find the cause

Posted on Apr 22, 2009

MicrowaveSvc
  • 9047 Answers

SOURCE: Model mh1150xms3 displays F2 and touchpad stops working

F2 on a Whirlpool microwave means you have a shorted membrane keypad.

If and when an oven is coming on or doing anything by itself, this is very dangerous and can result in a fire.

So until it is repaired, please leave it unplugged or leave the door open when it's not in use, and please do not leave it cooking unattended.

On this model, the membrane keypad is not available as a separate part, so you would have to order the control panel frame assembly which comes with a new keypad.

It's actually a pretty easy do it yourself job.

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.

Next, disconnect the strip as shown in the photo below, then remove the screws that hold your circuit board in the old frame.

40716d4.jpg

Then carefully (since the display is made of glass) move your circuit board to the new frame, and reassembly is the reverse of disassembly.

The part numbers to order are shown below by color you can get it here.

8185286 White
8185288 Biscuit
8185287 Black
8204739 Stainless

You can also find helpful exploded view diagrams at that link.

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

Posted on Aug 04, 2009

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The control pad only works on a few numbers.


Check to see if there is a ribbon cable between the touch pad and the circuit board. If there is, clean both ends with electronic contact cleaner, and re-connect.

If that doesn't fix it, you may have a bad touch pad.

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The unit has a fuse in the power board, but when the fuse is gone it does not even start up. If it starts it is not the fuse.

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HI. This is , indeed, an issue within the touch pad circuitry. it is damage, and will require replacement. I have located a replacement touch pad. Use the link below to access the touch pad. You can order the pad on-line, by clicking the link below.

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ut the tech sheet did mention that intermittent F7 problems are usually caused by poor connections. So I pulled the ribbon connector off the control board and cleaned the copper connectors using a pink pencil eraser. That whupped that puppy! But then I went out on another service call, same oven, different house. The pink pencil eraser trick didn't work on this one so I had to apply some of that famous Samurai gray matter. To identify the problem on this one, I cut power to the range and disconnected the ribbon connector that connected the touch pad to the electronic range control (ERC) board. Then I re-applied power and let it sit that way for 24 hours after which the customer was instructed to call me and report on the error code status of the oven. If no error code was reported, I knew the touch pad was the problem. If, on the other hand, the F7 error code came back, then I knew the (ERC) was the culprit. In this case, the error code did not come back during the test period and, using my keen, Vulcan-like powers of deduction, concluded that the touch pad was defective. I replaced the touch pad and problem solved!

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