Replace a broken or malfunctioning Joycon sensor rail on the left side of your Nintendo Switch console. Each rail has a set of pin contacts that interlock with contacts on the Joy-Cons to pass charge, and button presses to the motherboard via ribbon cable.
iFixit Left Joy-Con Sensor Rail Compatible with Nintendo Switch : Video Games
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After only one month of using my OLED switch, the left Joy-Con Rail stopped holding the Joy-Con in place. Now the Joy-Con falls off very easily. Help. : r/Switch
Replace a broken or malfunctioning Joycon sensor rail on the left side of your console. Each rail has a set of pin contacts that interlock with
iFixit Left Joy-Con Sensor Rail Compatible with Nintendo Switch
Left rail & sensor for Joy-con controller Nintendo Switch OEM slider