Shelley S Port Huron , MI November 28, 2017 Appliance: Samsung Microwave SMH9187ST/XAA Samsung Microwave Smh9187st/Xaa / : Keypad wouldn't accept any entries just kept scrolling asking to input time. How to replace Microwave Control Panel Assembly. Researched replacement part. Ordered it online through appliancepartspros.com. Replaced with new part after it arrived and microwave is now working again! Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes