JVM1640CJ - Instructions

Went on Youtube and pulled up how to fix a microwave.

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.

the repair kit was useless the toggles were to big to go through the top the threads on the bolts interrupted the toggle i had to drill the holes thole to except the toggles I got bolts at the hardware store what a mess
Bob

Disassembly control panel and remove switch holder; test for micro switches for continuity. Holder had broken post on micro switch holder.

I went for the cheap things first. Ohmmeter showed one of the thermostats in the magnetron compartment was open. I ordered and replaced all three thermostats. Still no heat. I took the unit off the wall (aaarrgh!) and checked the oven cavity thermal cutout. It said 7 ohms. I tested by shorting the wires together, but still no heat. So, I ordered the magnetron and diode cable. When replacing the diode cable (be sure to discharge the big cap!) either I broke it, or it was already damaged. It came off in two pieces. The new diode cable was re-enforced with thick heat shrink tubing, to prevent such breaking. You need a very short screwdriver to replace the magnetron. Now, all fixed! ~$150. A new one lists for $2000, installed in the overhead. My wife thinks I am a genius.

The hardest part was removing/reinstalling the microwave from under the kitchen cabinets, but once that was accomplished the repair went very easy. The motor/fan assy was easily accessed once the microwave outer cabinet was removed and the part was even better than the original, with a stop on the motor shaft to insure proper reinstalling of the fan blade.

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.

mtg plate came and the rest was easy,did wiring in upper cabinet 4 microwave,drilled 1 1/8 hole in btm of cab 4 power cord 2 go thru.All this was done by common sence and a tape measure,no templates were with this unit (YARD SALE)GE1600,3 bolt holes 2 hold micro upafter installing on back plate,plugged it in and it worked! end of story.

. The part arrived in acouple of days and the repair to minutes. Good work Jim.

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

Lifted up the glass plate and stuck the assembly under it ;)

Replace the fuses

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.

Remove and installed new one.

No repair involved, just replaced......looked online and ordered, thought it would take 4-5 days, came in perfect condition within TWO 2 days. awesomeness