Question about LG LMVM1945 Microwave Oven

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Touch-pads unresponsive Intermittent prior problems have included light flickering on and off; carousel sometimes turning ... now, the entire touch pad set is unresponsive. Microwave has power (lights below and screen prompts for setting). Now, it reads "Locked" Thanks for any thoughts!

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Re: Touch-pads unresponsive

Some newer models have a child lock feature which can be accessed via a HELP or CUSTOM HELP pad. On recent LG models, try pressing the "0" key for 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. Has anyone ever sprayed cleaner directly on the keypad? Has anyone ever boiled on the stovetop without running the hood vent fan? Is the hood vent clogged? Any of these can cause moisture buildup on the control circuit board or in the keypad, which can cause odd problems like this. 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 (since 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. Please let me know if I can help further:

Posted on Sep 22, 2007

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If you have warrenty from GE or the store it will be covered. If you are not covered then it can cost about the same or more as a new microwave as they will have to replace the board. Check your warrenty's, then check the repair cost and check replacement costs. Usually a new microwave is the cheapest.

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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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