Linda R Warminster , PA May 22, 2015 Appliance: Samsung Microwave SMH9187ST/XAA Samsung Microwave Smh9187st/Xaa / : Se error. How to replace Assy Pcb Parts;Smh918. Followed utube videos ordered parts of possibilities. I replaced control panel with old motherboard is working fine so I probably can return circuit board. Appliancepartspros are a god sent with great deal on parts & returns Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes