Like any other electronics part, a PlayStation controller is susceptible to the occasional operational hiccup. While some people would throw their controllers away and buy new ones, there is an easy way to repair almost any problem that may arise with a PlayStation controller so that you are back in the game in only a few minutes, and your wallet isn't £13 lighter.
Remove the six screws from the rear of the controller. They are easy to find as they are located inside the six holes on the back of the controller. Once the screws are removed, carefully pry the two halves of the controller apart.
Lift the mainboard from the controller and set it down on the cloth. Two small motors and the shoudler buttons will also come out of the casing.
Dab a Q-tip in rubbing alcohol and gently scrub the mainboard. This will help remove dust build-up on the mainboard.
Place small amounts of crumpled up paper under each of the four main face buttons. This is to combat the natural wearing down of the rubber nubs that make contact with the mainboard so that when a button is pressed, the paper will make contact with the board and the button press will register.
Reassemble the controller by placing the mainboard back into the case as it was previously.
This also works for PlayStation 2 and PlayStation 3 controllers, as they are all essentially the same in terms of design.