Christian C Orlando , FL May 15, 2017 Appliance: Samsung Microwave Hood Combo SMH1816W/XAA-0000 Samsung Microwave Smh1816w/Xaa-0000 / : Start button was not functioning. How to replace Microwave Control Panel Assembly. Removed the old control panel. Swapped the mainboard. Then installed it the new control panel. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes