JES1039BJ - Instructions

remov cover to check voltage and found problem at the interlock switch ohm the switch and found it was open replace both switches it work fine now

First I had to accept the fact that the unit was designed to keep non-professional people from doing any repairs. The switch was installed in such a manner that I had to break the mounting to remove the switch, then drill a hole in the mounting to secure the new switch in place.

I assumed light was burned out and got a replacement bulb.
Removed back and side screws with slight difficulity.
Was not able to remove cover. The top front would not loosen. I tried every trick in my 80 year repertoire. I gave up and put it back together.
I emailed PartSelect last week explaining the problem. So far no reply.
I am sure I have the right model # and others seem to have little trouble removing the cover.
I paid $85 + tax for the oven and it has worked well for about 8(?) years.
From what I read here, I figured I could handle the bulb replacement.
I'm just out the cost of the bulb and shipping and the oven still works. It would have been nice to have the light work again but we will just wait until it quits working and buy another inexpensive unit.

Problem was due to a faulty door switch. Replaced with a new switch and the microwave now works fine! Only thing that was tricky was that LG uses the hex screws with a peg in the middle to keep the microwave cover on. Had to use a small screwdriver and pliers (on the screwdriver) to unscrew the screws.

Microwave would not heat food evenly with the new rotating ring guide i ordered it was as easy to replace as one, two, three. Took out the old ring guide and replaced it with the new one it was simple because it could only go in one way. i had it done faster than the time it took to write this. i love it works great food heats up evenly and it was a lot cheaper than a new microwave.

lifted up the plate and screw it on

Replaced the fuse. Result; did not fix the problem.

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 .

Replace the fuses

I have the built-in microwave in the cabinet. The hard part was getting it out of the cabinet. Once out, removing the cover and replacing the bulb and fuse was very easy. You need the tamper proof star bits to take out the screws holding the cover to the microwave. I got the bit set from Amazon for about $8. My fuse was OK. But I replaced it anyway, since it was 4-year-old. I am no expert in appliance repair, but found it fairly easy to do the repair. After unplugging the microwave, wait for 20 to 30 minutes before opening it, so that the capacitor inside completely discharges. It is supposed to discharge in 30 seconds, but why take a chance of electrocution..?

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.

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.

Removed cover, diagnosed problem, ordered part from Parts Select, received part in 2 days, replaced part, tested and replaced oven into built in space.

Ordered the switches from Partselect, arrive in two days. Had trouble removing the plastic connectors from the old switch terminals, one of the plastic protectors broke, but was able to reuse it. It took a little figuring out how to remove the existing switches. Must push in a tab and rotate the switch on a little pin, then remove. Must be careful not to break the plastic tabs holding the switches in place. Replaced all (3) switches at the same time. All in all it was pretty easy.

First unplugged the microwave, took top grill off, took control panel off, took wires off and used color coded tape to make sure they went back in right places, took fuse out and replaced it and put every thing back and it all worked fine and to top it off my wife did it all. So it was pretty easy.