オリジナル投稿者： Andrew Fillhart ,
I'm taking a wild stab at this one after looking at the internals of a SNES controller. It appears that the signal transfers through the circuitry after the button is pressed, very similar to how all of the buttons on that controller work. Open the controller again and take a look at the silicon pad that the L-button presses down on. If that pad is glossy or shiny then it's not making a proper connection. There are at least two ways to clean up the silicon pad: # Take an eraser and lightly rub the shininess away so you get a dull, matte finish. You can even take the eraser and clean up the contact on the board. # Get a sheet of paper and gently drag the silicon pad across it until you get a solid, dark gray streek. Try those out and see if it brings the L-button back to life.