The dispenser panel was working for ice cubes and crushed but no water would dispense then the complete panel stopped working none of the green lights or the the light would come on. It appears that no power is coming to the dispenser board or the main board is defective. How do I determine which is defective? Is there a way to take any readings to find out was is defective?
You can test the display board by pulling at the bottom of the display and the dispenser control will come off. There will be a 3 wire connector that you will test red to white and should have 12 vdc coming to it. If there is power there then the issue is the display board. If there is no power then check at the bottom of the door to make sure that the harness does not have loose or broken connections. If this checks ok then the issue would be in the main control board.