Question about LG LMVM1935 Convection/Microwave Oven

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How to replace keypad on LG Microwave

Someone cleaned our microwave and the display stopped working, but the microwave still worked. Now after two weeks, the stop and start button will not work, therefore our microwave is useless.

We just purchased a new keypad, but do not know how to take the old one off and replace with the new one. Can someone help us with directions of how to fix this microwave?

Thank You!

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If you might want to replace it yourself, I have uploaded a handy guide with pictures showing you what's typically involved.

It's at http://www.microwavedisplay.com/keypad_replacement.pdf

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

Posted on Jun 23, 2008

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Frigidaire microwave model ffmv164lsa constant beeping, with little symbol to the top left hand side of the clock displaying with the beep.


Hopefully no one sprayed a liquid cleaner directly onto or near the keypad...

From page 23 of the owner's manual:

"Wipe the microwave oven inside and out with a soft cloth and and warm (not hot) mild detergent solution. Then rinse and wipe completely dry."

"Clean the outside surface of the microwave with soap and a clean damp cloth. Dry with a clean soft cloth. To prevent damage to the operating parts of the oven, do not let water seep into any vents or openings."

If there is moisture damage, it may dry out by itself if you leave it overnight with the door open. If not, the warranty would be voided and you'd have to arrange for out of warranty service.

If there is no moisture damage, and it failed not due to outside forces, then you should contact the manufacturer to arrange warranty service.

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No key's work. Display and inside light is working


The Keypad is either faulty, or disconnected. Open the case, and remove the screws, holding the outer shell on. Inside, there should be a small board that covers the Keypad. Check to see if there is a ribbon cable, or some other type of connection going from the board to another part of the microwave. If all of the wires are connected, then you will probably need to replace the keypad.

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see this causes and fix it. God bless you
If you have a stuck key or non-responsive key, most of the time you will have to replace the keypad for this microwave oven repair. If your keypad is connected to your control board by a flat ribbon wire, try disconnecting it and clean the silver contacts with an ordinary pencil eraser. After cleaning, plug it back in and try it. If it doesn't fix it, replace the keypad unit. Some units actually have keypad tests to confirm your diagnosis of a bad key.If your keypad and control is the same unit, replace that unit. Another note, unlike stove/oven keypads and controls, most microwaves do not have error codes or tests to distinguish whether it is truely the keypad or control. Most of the time, it is the keypad that needs replacing, but a small percentage of the time it can be the control. Check the tech sheet if they can point you to the right part.

10_11_2012_10_37_39_am.gif

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use the common sense,logically, fix it. God bless you
a stuck key or non-responsive key, most of the time you will have to replace the keypad for this microwave oven repair. If your keypad is connected to your control board by a flat ribbon wire, try disconnecting it and clean the silver contacts with an ordinary pencil eraser. After cleaning, plug it back in and try it. If it doesn't fix it, replace the keypad unit. Some units actually have keypad tests to confirm your diagnosis of a bad key.If your keypad and control is the same unit, replace that unit. Another note, unlike stove/oven keypads and controls, most microwaves do not have error codes or tests to distinguish whether it is truely the keypad or control. Most of the time, it is the keypad that needs replacing, but a small percentage of the time it can be the control. Check the tech sheet if they can point you to the right part.


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1 Answer

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see the next steps: USE THE commons sense . God bless you
Lights come on, but can not program unit, Touchpad dead If you have a stuck key or non-responsive key, most of the time you will have to replace the keypad for this microwave oven repair. If your keypad is connected to your control board by a flat ribbon wire, try disconnecting it and clean the silver contacts with an ordinary pencil eraser. After cleaning, plug it back in and try it. If it doesn't fix it, replace the keypad unit. Some units actually have keypad tests to confirm your diagnosis of a bad key.
If your keypad and control is the same unit, replace that unit. Another note, unlike stove/oven keypads and controls, most microwaves do not have error codes or tests to distinguish whether it is truely the keypad or control. Most of the time, it is the keypad that needs replacing, but a small percentage of the time it can be the control. Check the tech sheet if they can point you to the right part.


8_1_2012_2_45_46_pm.gif

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1 Answer

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The keypad control board has probably failed, only option is replacement, but part alone is $97. or more, maybe cheaper to replace the unit.

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liquid probably has entered keypad laminate; causing a short. unplug unit, direct warm hairdryer to entire keypad; plug back in; and hope for the best. if no luck; replace keypad. also never spray anything directly onto keypad; always clean with a moistened towel with light force.

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2 Answers

LG Microwave oven LMVM2055ST


Same issue here. LMVM1935 about 2 months past warranty keypad stopped working. Apparently they need to add something in the manual about not boiling water on the range over which the microwave is installed (gee who would have thought that there would be steam over the cooktop and we should seal the membrane?).

The silver traces on the keypad got corroded and no longer conduct. After complaining to Sears (NO HELP) and LG (EVEN MORE INEPT) and running on 30sec button for about 6 months, I found a replacement keypad $30 w/ shipping and didn't break anything taking the door apart, thanks to the parts list link above. Thanks Rickzilla!

Life's Good, Their Keypad SUCKS, or apparently we are the only people that boil water anymore.

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1 Answer

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Is it possible someone may have sprayed cleaner directly onto the keypad area?

This causes moisture to get into the keypad and sometimes onto the control board.

This could mean that they control panel frame with keypad (membrane switch) would need to be replaced.

Can you give more details on the cleaning?

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6 Answers

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This model does have a child lock. If it's on, the display will say "LOCKED". It is turned on and off by holding dfown the "0" key for 4-5 seconds. You may also 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 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. Apply an alcohol-based cleaner (such as the purple kind) to a cloth (paper towels can scratch) and gently wipe it off. I suggest to my customers that they NEVER use any ammonia-based cleaner (like the blue stuff) on a microwave, since the ammonia will crack and distort polycarbonate plastics. Repost if you need more help.

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