I put in a New Control Board again and i Still cant get in the Service Diagnostics Mode
so that Board is bad to
the Way I'm Trying to access the Service Diagnostics Mode is pushing the Temp Set switch and the door Switch at the same time, thats right Right?
See your evaporator thermistor on the 2nd photo, on the top right side that's clipped onto the top of your evaporator coil? See the white connector that connects to it? It looks like its burnt there, take that connector off and see if the contacts inside that connector are burnt. If not burnt, then you will need to ohm test that evaporator thermistor, because if that's bad then that's what's causing this frost build-up problem.
This is how we test the evaporator thermistor--->WHILE ITS FROSTY, your freezer evaporator thermistor should read about 8.7K ohms. Always Unplug the refrigerator first before ohm testing.
If it's not frosty put in a glass of ice water and wait at least 5 minutes before ohm testing it.