How to Troubleshoot & Replace Lg AP4437957 / 3B73362F Microwave Door Switch

I ordered the latch board assembly and some interlock switches from AppliancePartsPros.com. It arrived in a very short time. I replaced the old parts and now my LG microwave runs like it did when it was new. 

I put a new one in. 

Desmonte el frente ,saque la pieza que soportaba los swiches, cambie los swiches y todo esta normal. (Disassembled the front, removed the piece that supported the switches, changed the switches and everything is normal) 

I looked online for solutions as to why my turntable was not working and microwave not heating at the same time. If the motor for the turntable was not working then it should have still been heating and it wasn't. Online sources indicated a bad switch in the door. Initially, I thought I would have to remove the entire unit from over my stove. THIS WAS NOT THE CASE. I found a video on youtube, that showed how I could access the switches from the front of the unit. I used a Philips screw driver and loosened about 6 to 8 screws and I had access to the switches. I noticed that one of the switches was slightly melted. Probably due to opening the door mid-cooking and not hitting the stop button first. ALWAYS HIT STOP BEFORE OPENING YOUR MICRO DOOR! I did struggle pulling the wire harness off the switch due to the melting. I was going to replace all three switches at once but decided not to. The other extra switches I ordered I taped to the inside cavity of the micro for future use. I tested the switch with a voltmeter and saw that it was shorted out. I changed the switch and voila! My micro was up and running again. As always, unplug the microwave and be careful as some electronic components could still hold a charge even after being unplugged. 

I took the cover off and checked the door switches and one was stuck open. Replaced the top and bottom switches just to be safe. Took longer to get the cover off than to replace the switches. 

The microwave light came on, but the dish did not spin and the microwave did not come on. Turns out it was the microswitch in the upper door latch assembly. The control panel was removed. Then the switch was taken out and replaced and fixed the problem. It took 15 minutes to do. 

Unplugged microwave, removed the vent panel and and control panel to gain access to door switch. Replaced the switch and re assembled. DIY videos on line helped a lot. 

Went on youtube. Saw that 80% of the problems were caused by the door closing switch. Gambled on less than $10.00 to fix it myself or order a new microwave. Pulled the old switch, installed the new switch pugged it in, and Presto a new old microwave. Less than 30 minutes and back in business. 

Took it apart and ended up breaking the bracket that that three switches were mounted on. So I ordered the necessary parts to fix and it went fairly well as we live in the country so we learn how to do some of these things ourselves as it would have been cheaper to just replace the unit than to repair. Anyway, it is up and running, so one for me this time. 

Replaced broken parts.