Alex K Kirkland , WA August 09, 2015 Appliance: General Electric Free Standing Microwave HVM1540SM1SS Ge Microwave Hvm1540sm1ss: Microware turning on by itself message "keypad shorted". How to replace Smart Board. Replaced the control board. The top plastic panel on the microwave is held in place with screws and glue, and is very fragile, so I broke mine when trying to take it off, be careful. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes