Jeff R Crescent City , CA July 12, 2015 Appliance: Samsung Microwave SMH9187ST/XAA Samsung Microwave Smh9187st/Xaa / : Touch pad operation eratic. How to replace Microwave Touch Control Membrane Switch. Replaced touch pad with a new one after removing old pad and scraping off old glue. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes