Things You'll Need
Instructions
Unplug your PS3 controller from the port at the front of the PS3 console.
Turn the controller over and remove the five screws on the sides of the back of the controller.
Remove the back half of the controller from the front. You will now have access to the main circuit board in the front half of the controller.
Remove the single screw holding the circuit board in place. It is located in the center of the board.
Remove the circuit board. You will now be able to see the rear of the controller buttons.
Pop the "X" button back in place in its space in the controller.
Replace the circuit board and screw. Replace the back half of the controller and screws.