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Bought faulty - only the thumb sticks and start/select worked. I figured there was a broken trace in there somewhere and something that would be simple to fix. Or perhaps a build up of carbon on the silicon pads that "just" needed cleaning. It turns out that these controllers, instead of bridging the pad when the buttons are pressed, use a resistor (the dark rectangles) that when pressed, the resistance increases (or decreases…though I'm fairly sure increases) and that is measured. The problem i...