The water tank behind the lower refrigerator drawers is froze. When the air doesn't circulate the coldest air in the refrigerator settles to the bottom and freezes everything. It sounds like you evaporator fan is shot. It probably just shakes a little bit. That is a sign that it has gone bad. Replace the evaporator fan and your refrigerator will return to normal operation. When you replace the fan, use a hairdryer to thaw out the water tank.
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On the back of the refrigerator is the main control board. Other than the door switch, this control board is what supplies the power to the fan. If replacing the fan hasn't solved the issue this is the only other thing that it could be. You are going to have to replace the main PCB for the fridge. Check all the wires going to the board. Make sure there aren't any loose connections. Without being able to check the fan, does leave a little room for error. I hope this information is helpful to you.
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