This guide will show you how to take apart the fan to remove the Printed Circuit Board.
Use a Philips #2 screwdriver to unscrew the four 6mm Phillips #0 back screws.
Pull the front and back cover apart.
Remove the Phillips (5-mm head) 6-mm screw that holds the circuit board to the outer shell of the fan.
Remove the top cover containing the circuit board and the wires by pulling it away from the body of the fan.
Remove the circuit board from the top cover. Do not touch the other side of the circuit board as you may damage circuit elements.