Jeff M Chesterland , OH December 14, 2015 Appliance: Samsung Samsung Microwave Oven MW5580W/XAA Samsung Microwave Mw5580w/Xaa / : No power no display. How to replace Microwave Thermostat. Pulled up a u tube video and performed a test that verified that the thermostat had failed.Replaced with new part and problem solved 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes