Turn off the power to the dishwasher from the kitchen circuit breaker if it's not already turned off.
Open the dishwasher door and remove the top screws from the control panel using a screwdriver.
Close the door partially, not all the way, then lift up the control panel from the dishwasher door.
Disconnect the two wire harnesses from the control panel and remove the wires from the wire clips at the bottom of the control panel.
Remove the entire control panel from the door and set it aside. Remove the screws from the circuit board, then remove the circuit board from the control panel.
Place the new circuit board into the control panel and reinsert the screws. Insert the new control panel into the same position.
Reconnect the wires to the wire clips and reconnect the two wire harnesses. Open the dishwasher door slightly.
Reinsert the top screws into the control panel, then turn the power supply back on at the circuit breaker.