Ice door cycling automaticly,huge block of ice in freezer.

Started with removing freezer door assembly, with the freezer compartment empty next to remove was the rear panel exposing the thermostat and evap coils. With frige away from wall, I removed panel covering the circut board. Used the hairdryer to remove ice from coils and surrounding area. Did a continunity check on wires from thermostat to the circut board, door connections to the board, ohm test on thermostat. The goofy things that frige was doing( blinking lights, ice door cycling on it's own, 3'' slab of ice sitting at the bottom) I called the board bad. Bad board!! Use a small standard screw driver to gently force retaining tabs (2 each) back to remove the circut board, be gentle the tabs are plastic, slide the board out. For the install it is really going in a reverse order. Slide the in and gently snap the circut board in the tads, make your connections, reinstall panel, freezer interior panel, and freezer door assembly. Good straight forward stuff. The programming steps are also straight forward, I did this step 4 times before it got it right.. Hope this helps.