Things You'll Need
Instructions
Unplug your 360 controller from the port in the front of the Xbox console and place it face down on a sturdy work surface like a table or desk.
Unplug the battery unit from its port in the back of the controller and set it aside.
Use your Phillips screwdriver to remove all six exposed screws located on the back of the controller and set the screws aside. Then remove the single screw in the battery compartment and set that aside.
Lift the back half of the controller from the front half and set it aside. The green circuit board and triggers will now be visible in the front half of the controller.
Fit the lose trigger back over the spring it connects to. When it snaps in place, you'll know it's secure.
Replace the back housing and screws of the controller. Your triggers should now be working without any problems.