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The evaporator fan motor draws air over the evaporator (cooling) coils and circulates it throughout the refrigerator and freezer compartments. Some refrigerators have more than one evaporator fan motor. On refrigerators with only one evaporator, the evaporator is located in the freezer compartment. If the evaporator fan is not working, it will not circulate the cold air to the refrigerator compartment. If this occurs, the freezer may still get cold, while the refrigerator will not get cold. To determine if the evaporator fan motor is defective, try turning the fan blade by hand. If the fan blade does not turn freely, replace the fan motor. Additionally, if the motor is unusually noisy, replace it. Finally, if the motor does not run at all, use a multimeter to test the motor windings for continuity. If the windings do not have continuity, replace the evaporator fan motor.
The start relay works in conjunction with the start winding to start the compressor. If the start relay is defective, the compressor may sometimes fail to run or may not run at all. As a result, the refrigerator will not be cold enough. To determine if the start relay is defective, use a multimeter to test it for continuity between the run and start terminal sockets. If the start relay does not have continuity between the run and start terminal sockets, replace it. In addition, if the start relay has a burnt odor, replace it.
Ok so if you have already replaced those things then yes its a malfunction with the control board. I can find that part for you if you are interested in replacing it.
Typically it doesnt but I mean it would certainly be a good thing to check before replacing the control board. Can you access it?
If you have already replaced the main control board and are still having this issue it sounds like something is not hooked up correctly or something is missing. I will opt out and open this up to other experts to see if they have a better idea of what is going on.
I have been looking into some other issues and I am beginning to wonder if The problem here is with the defrost system. Either the defrost heater has failed or the defrost sensor. Open the freezer door and take the shelf/drawer and food out of the freezer. Next take the panel out in the rear. Behind this panel you will see the evaporator (looks like the radiator on a car) Looped below the evaporator you will see the defrost heater, test this with a ohm meter, if it reads open then it will need to be replaced.
If the heater is good (reads continuity) then the sensor is bad, this is located clipped to the top corner of the evaporator. In this case replace the sensor.
Have you been able to figure out anything more?