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I got two NES controllers real cheap few months ago. 1st needed new set of conductive pads and a little bit of cleaning of the PCB; but, has some cosmetic dings. 2nd needed deep cleaning inside and out plus new set of conductive pads. Both are working a whole lot better now.
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Used a @retroUSB's NES RetroPort cables to test out the controllers on Windows and in RetroPie.