B button hardly registers on New Nintendo 3DS XL
I’ve tried using air on the button, and opened up the console to clean the buttons, but my B button still only registers half the time
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I gently took off the conductive film on the button board and cleaned the metal parts with isopropyl alcohol. After placing it back on the board, the button works fine.
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Have you checked what is the state of the rubber pads of the buttons? They should have a carbon coating underneath that makes the contact with the mainboard. Probably that has worn out and needs to be replaced - try installing a spare rubber pad to see if it makes any difference.
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