My LMVM1935Sb is plugged in, there is a light in the microwave when you open the door. Screen shows the correct time. However the keypad, the Light and the Vent Fan button are non-responsive. Is this a bad circuit board or possibly a fuse? (I tried the parental lock trick and that did not work.)
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.
You can call LG / Goldstar at 1-800-243-0000 (select option 2) to order parts. You might also ask them if they have parts distributors or if you have to order direct from them.
They may call the part a keypad, membrane keypad, membrane switch, etc. It may come separate or with the control panel frame. That second way is easier to swap, but costs more.
BUT - Make sure they don't try to just steer you to a local repair shop before they are clear that you want to buy "repair parts" yourself.
Otherwise, you can try calling a couple of local appliance parts companies in your Yellow Pages.
If they sell just the membrane keypad / membrane switch, then you can essentially peel off the old one and stick a new one on.
You do have to take the oven apart, and you need to observe a few precautions. You can find my crititcal safety info file by doing search on Yahoo.com (not Google) for:
microwave safety.txt
If you decide call a local shop to do the work, I would recommend one that is "authorized to work on LG microwaves under warranty". Ask them just that when you call. They're more likely to have the repair manual and hotline access to get parts quickly.
Good luck.
Two other things!!!
Sometimes (not often) you can get lucky and find that there is still some moisture on the circuit board and that the keypad is not bad.
Then you can carefully blow out the moisture with an air compressor or maybe use a heat source to dry it out.
Also, some residue can remain inside the keypad connector. Here's an excerpt from my help file on that subject:
If certain keys are not working, there may be some foreign substance at the point where the green or blue plastic strip from the keypad plugs into the circuit board. To check that:
1. Be sure the oven is disconnected from the power line while you are taking it apart.
2. The keypad connection is the green or blue translucent plastic strip that plugs into a connector near the edge of the board.
3. There are two tiny tabs (one on each side) of the connector that you can gently pull up on to unlock the connector.
4. Then the keypad strip will lift out. Clean both sides of the end of the strip with alcohol-based cleaner if you like, but do not use ammonia-based cleaner. Dry the end of the strip.
5. Put the keypad strip back in, making sure both sides are down fully.
6. While holding the strip down, push the connector back down to lock it.
7. Try the keys again with the door closed.
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Heat the keypad with a hair dryer. The problem is generally moisture. After a minute or two or three of heat, the keypad works. Did so on a Sharp, Panasonic and Black & Decker.
Keypad quit working on similar LG model. Buy replacement keypad for $30 at repairclinic.com. Turn off power, remove two screws on top. Take top cover off. Remove control panel on right via two screws (it folds down on two plastic tabs at bottom. Remove two wires, wire harness (has clip on back) and remove control panel. Keypad ribbon is removed from circuit board by pulling up on sides of black connector. That slips up lock on ribbon allowing ribbon to be removed. Keypad is stuck to face with sticky stuff so remove at face by peeling off corners and pulling loose. Replace is opposite of installation.
Replace Keypad
Sir,
My micro oven model no.MS-2342AE
Micro oven start button on key pad is not working please let me know how to set it right
rajalakshmi
I have LG MICROWAVE MODEL NO MC 7647UL IT SHOWS E10 PROBLEM AND TOUCHPAD IS NO WORKING PLS GUIDE ME HOW TO REPAIR IT
GOVIND 9414552320
SOURCE: 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.
SOURCE: How to replace keypad on LG Microwave
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.
SOURCE: Part of the keypad on
Hi,
The keypad has gone bad...
Here
is a tip that will help you to figure out what is wrong with your
Microwave Oven....
Basic Microwave
Oven
Troubleshooting Tips
heatman101
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Holy Cow! My wife said she was cleaning the microwave right before it stopped working. As an update the Light/Fan button has come back (working) but nothing else. How difficult is it to replace these keypads and can I do it on my own (where would I get one), or should I have a professional come and do it?
Again top notch response, thank you very much.
when i was cleaning the microwave with water i sprayed a littl bit at the exhaust fan area.after few minutes the keypad is stops working properly. what should i do?
KEY PAD IS NOT RESPONDING WHEN WE TOUCH IT.
I UNPLUGED & PLUGED BACK IN .
THE DISPLAY ASKED ME FOR TIME OF DAY.
AGAIN KEY PAD NOT RESPONDING.
LIGHT COMES ON INSIDE THE MICROWAVE WHEN DOOR IS OPENED.
ANY SUGGESTIONS ??
had the same problem unplug and leave it over night and mine started working
Mine is actually the LMVM2075ST which I bought in 2007. Exact same issue. Called LG which said I had to repair myself. Did anyone have any luck with the company support. It is ridiculous how much I paid for this faulty product. I thought LG was a good brand.
my keypad is not respoding
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