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What tests did you do to determine that the board should be replaced?
Was the refrigerator making ice (just not dispensing it)?
Did you test the water valve/solenoid?
If the unit is making ice, I would not look at the water valve.
Let's go back to the what you see now. The dispenser is still not lighting up....right?
The new board changed nothing... correct?
Do you have schematic of the electronics for the refrigerator? You want to check for voltage at the board that controls the dispenser. Then trace this back to perhaps another board that determines the voltage to send. Eventually all things will lead to the main board. However, you find bad wire, capacitor or board before the main board.
I am also guessing that you are not under any warranty (because the more work that you do the more you risk voiding any existing warranty - SOME PARTS are covered for more than a year).