This morning I got up and my fridge was 52 (set on 37) and my freezer was -15 (set in 0). I started looking into it and there was an inch of ice on my freezer floor. I got behind the fridge and I could see the compressor and fan running fine. Would this be a bad mother board.
There is a damper that is located at the back of the refrigerator compartment that needs to be checked to make sure that it is opening and is not damaged. If the damper is not opening it will cause the issue that you are having with the unit. For the ice that is on the floor of the freezer, this would be a issue of a clogged drain which is located under the evaporator behind the wall in the freezer. Clean out all the ice and flush with hot water.