Microwave oven will not work

Question

I have a samsung MR5493G in my 2002 Coachmen RV. The touchpad has recently stopped working. How can I repair/replace? Display keeps showing " Samsung-Simply-50". ???Samsung microwave oven (MR1032BB) Can't set the clock after resetting main breaker. Microwave starts on its own and adds time to the run. All touchpad sensors seem to be lock out.