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That model has two evaporators one for the ref, and one for the freezer and it has one compressor, so it uses a reversing valve to change the flow of freon from one evap to the other to control the temps in each compartment the computer tells the valve when to reverse, if you have changed the board and all the fans are running then the odds are that the valve is sticking and not reversing when its supposed to, and that is a major repair, the sealed system has to be opened up and the valve has to be replaced.
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Is the freezer cooling at all or just not cold and is the fan inside the freezer running?
it's possible you do not have the model I am referring to and I can't seem to locate a tech sheet for that unit so I will pass this on so that another tech can help with this issue, thanks.