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Buttons on the controller are difficult to press down or get stuck when they are pressed.
If there is dirt or residue on the buttons, then it could interfere with the button’s ability to move properly. First, try removing any visible residue with rubbing alcohol and a cloth. If the problem continues, the problem could be internal, so you should follow this guide to take apart controller and clean the buttons individually.
It is possible that the pad that the buttons are on are damaged. If they are, you will need to open controller and check rubber padding underneath the buttons. If they appear to be damaged, they will need to be replaced.
The joystick is physically broken and needs replacing.
If the rubber on the cap of the joystick is torn or if the stick itself is chipped, you can replace the whole analog stick casing by opening the controller. With the spare analog stick, this is a relatively easy fix.
The cord connecting the controller to the USB port is visibly damaged
If the only damage to the wire is exposing the inner color coded wires, but is not exposing any copper wiring and the controller is still functional, you can protect the cord from further damage by wrapping the damaged area with electrical tape.
If the internal copper wires are exposed or the cord is cut in half, you will need to solder the wires back together. Make sure to match the colors of the wires to each other when soldering them.
The USB on the controller is not functional or misshaped to the point where it cannot be plugged in
If the USB is misshaped, depending on how severe, it is possible to bend it back into shape with pliers. Be aware that trying to plug a USB that is not shaped correctly into a computer could be very damaging to the port on the computer. If the USB cannot be bent back into shape well enough, consider replacing the USB as a whole.
Much like the cord replacement, you will need to solder a new USB connector onto the cord.
The trigger buttons appear to be perfectly fine but they are not functioning
It is possible that the wire that connects the triggers to the main controller logic board is damaged. This would make the trigger appear to be fine, but actually not able to transmit any data. To check and fix this problem, follow this guide.
The LED is not turning on when the controller is plugged in
If the LED is not turning on and the controller is not being recognized by the computer, it is likely the controller as a whole is not getting power. Check to make sure the controller is plugged in correctly. If the cord is not damaged in any visible way, and the controller is being recognized by the computer, then the LED itself is most likely damaged.
If the controller is functioning but the LED does not turn on when the mode button is pressed, then the LED needs to be replaced. This will require you to disassemble the controller, remove the LED, solder a new 2mm LED in its place.
