Larry C Frisco , TX January 28, 2019 Appliance: Samsung Built-In Microwave Oven SMH9207ST/XAA-0001 Samsung Microwave Smh9207st/Xaa-0001 / : Samsung microwave erratic on off of fans and eventually no power on. How to replace Microwave Door Switch. Tested door interlock switches. Found one switch bad. Ordered the door interlock switch bracket assembly (which, by the way, included all 3 new switches. Installed assembly in 15 minutes. Works perfectly now. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes