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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
Do you know for sure that you have a good 12 VDC or over to the board? Double check that leads to the board again. Do you have a small digital multimeter so we can do some testing? That would be the quickest way to get to the source of the problem.
I am adding a link to a copy of the Dometic Service Manual for you. Print this out so you have it. We will use this to do some testing. http://www.fourwh.com/NewDometicRefrigeratorManual.pdf
Did you install another OEM board or an after market Dinosaur Electronics board?