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It's some type of TVS Diode, I haven't bothered to dig any more than that. It's not needed and will work perfectly fine without it.
The only things on the RSX line are D27, C25 and R57.D27 is some type of TVS Diode, an issue with it would cause a drift left. C25 is just for decoupling,and if it were even partially shorted, again it would drift left.R57 is in series with the Wiper of the POT and would cause no drift either way.What you most likely have there is a controller that was calibrated from the factory with a crap stick in it, and every one you've put in since has just been a decent one. You'll need to tweak the POT to get it straightened out.
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Hey, so I've changed the left stick on my Elite controller, no lifted pads, everything good after the repair i tested the deadzone, the click of the stick and it was working fineTwo hours later the controller doesn't turn on, with batteries or with the micro usb cableSo i open it and test for shorts (without pluggin in to the micro usb or with the batteries, nothing, i plug it in with the batteries, shorts everywhere the same with the micro usb portSo i own an 1697 controller to test which board is faulty and for my surprise is the Joystick board, i can't get it running, I've removed C47 and the controller want to turn on, but the light is so dimDoes anyone have an advice for me?thanks.