JVM1490B - Instructions

Checked all sensors with a multi-meter, found the thermostat to be the problem, no continuity.

Removed plate inside door cover and removed old screws and plastic handle. Reassembled.

Ridiculously easy, unscrew, and change bulbs. Having the correct bulbs made all the difference, I did not have to waste time looking for the correct one.

Removed inner trim panel. Bottom screw was visible But upper screw was behind metal frame that trim plate snaps onto Removed that to access screw. Door latch had to be removed to. Not a big deal just be sure spring on latch is reinstalled same way it was removed. Took longer than expected but way cheaper than a service call. Part arrived on time

removed key pad then removed latch assembly and replaced it with new latch assembly.

Initial failure of over range microwave Aug 3rd. Control Panel worked but no heat. Took to local LG authoriaed local repair place. They fixed it quickly and we re-installed it. Worked fine for 2 months then had similar failure again. Agaim took to same authorized repairer. They kept unit for 3 months but finally concluded theu could not fix it and suggested we contact LG for a partial refund. When they tested the unit during re-assembly in my presence, there was a blue flash and the fuse blew. Since we had built a custom tile mural back splash around this unit, I brought it home, ordered a number of time delay fuses new capacitor and two new high voltage diodes. However, using my Fluke DMM, I checked the existing capacitor and high voltage diode and they checked OK so I just replaced the time delay fuse. The high voltage transformer leads had 2 possible ways to connect to capacitor and diode. Tried one way, plugged unit in and turned it on, and immediatly blew the fuse. Replaced the fuse and reversed the high voltage transformer connections,amd turned unit pn, and it worked perfectly. Since we had experienced several power failures during the time of the original failure, the repairer concluded that power spikes might be at fault, so I also purchased a TrippLite ISOBAR4ULTRA 3300 Joule surge protector between wall outlet and microwave, and re-installed over range. It has worked perfectly since.

unplug the unit then pull down , lot of screws are on top. open the cover . you could see the parts that need to replace on the right hand side (heavy side). disconnect wires then test the parts that need to replace by a tester to make sure that it's really broke .then unscrew part and replace .

Removed screw holding faceplate that covered bulbs. Next inserted new bulbs into sockets.
Turned on surface light to insure they worked - they did. Re-attached faceplate.

Screw out-old bulb out- new bulb in- screw back in!!!!!

Removed the glass shield and inserted the 2 bulbs. Then replaced the glass shield.

The staff were terrific. Thanks so much as it had a happy ending.

Anita

Inside "cavity" bulb was a PITA. Need to remove top decorative trim (2 screws and tabs) to access bulb housing. Broke 1 screw tab so be careful (Wiggle it more). Acccess to bulb housing was made for younger smaller hands, attached by 1 screw. Remove screw, rotate housing, replace bulb. Reverse proceedure. Outside bulb, cake...1 screw, drop lens replace bulb, your done.

Replace the fuses

I UNPLUGGED the microwave and removed the cover, using a phillips and a Torx screwdriver for the machine screws. I set these screws aside, so as not to confuse them with the later encountered screws. I photographed the magnetron to assure proper placement of the 6 phillips machine screws involved in reassembly (marking the the locations on the old magnetron would do as well. I marked the old magnetron "old", to avoid later confusion. I removed the two screws holding the shields to the magnetron. I removed 3 of the 4 screws holding the magnetron to the microwave, leaving one of the top screws. I held the magnetron securely and removed the last screw, pulling out a the part of the magnetron that penetrated the microwave. I installed the new magnetron in reverse order. One problem I encountered was locating one of the six screws, which had been pulled into the old magnetron by magnetism.

Removed old bulbs replaced with new. Bulb fit perfect thank you

took glass cover off being an electrician and saw lamp or bulb was burned out. googled your site and with model number.went on partselect found lamp,orderd it.2 days later lamp arived installed lamp. So easy no running around or making several calls