Nick O Sheffield , PA August 27, 2016 Appliance: Samsung Microwave SMH9187B/XAA Samsung Microwave Smh9187b/Xaa / : Keypad would work sometimes it would flash "se" codes and sometimes it would start running with nobody around!. How to replace Microwave Switch Membrane. Replaced keyboard (switch membrane) Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes