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

Disassembled microwave panels and ohmed out all door switches and found one with zero continuity. Replaced door switch, which was the very top one and assembled microwave. Tested microwave and everything works properly 

Found info on your site, ordered switch and replaced in about 10 minutes. A previous blog entry on your site mentioned it was the top one. I pulled that switch out and with the power on, just moving the wire with the switch, the power cut on and off. Ordered switch that cam in two days and replaced part in 10 minutes. It would be nice if there was a less expensive shipping option, the S&H was more that twice the price of the part 

Replaced the microswitch for the fan. 

Ordered a new switch. 

A video on U tube helped guide me to the problem. APP got the part to me quickly. 

Removed the back of the microwave to get at the switch assembly and find the bad switch. Once I located that switch I went to your web page and looked up the Microwave by manufacturer and model number. Your page had a great photo of the switch assembly. All I had to do was locate the broken switch to get the part number. I ordered the part, it arrived promptly and went in without any problems. The unit works again! 

Replaced micro switch . The old switch had lost the internal red button connection. 

Replace microswitch. 

Replaced the bottom micro switch (bottom of 3) on the door assembly, and it fixed the problem. 

Replaced the faulty sensor. This unit was 'trash - picked'. The repaired unit was donated to a once homeless family rebuilding their lives.