Light is on, but microwave does not work.
SOURCE: LG microwave oven
It's usually a bad door switch or a broken door switch mount. Once in a while it's due to a board problem. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk
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: lg LMV1630st stainless steel microwave oven
Make sure the door is aligned and closes safety switches.
SOURCE: Microwave Does Not Heat.
Test the high voltage capacitor,the rectifier diode.or the magnetron.
If it additionally does not spin and no light, then check also the door switch.
The diode and capacitors can br tested. The capacitor must be alloweddischarge before testing, or you risk to get electrocuted, even ifpower is off. Capacitors can get discharged by shorting their twocontacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.
All locations, and description of this parts can be located using the diagram here: Counter top.
Parts must be tested to find out what is wrong.
Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.
Regarding parts, contact the seller here to purchase parts. (here in UK).
SOURCE: LG Microwave MH-685HD Owner's Manual
Try this website: http://www.service-manual-owner.com/lg.html You may have to email the person to get the manual?
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