My left stick goes up and down, but not left and right.
My left stick goes up and down but not left and right when plugged into the switch adapter. It only reads up and down. When I plugged the controller into the Wii the controller read as holding down right the whole time. Reset controller w/ x,y, and start, but when I let go of the buttons it just scrolled again.
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4 
Have you tried to take it apart and clean the contacts yet?
由 Joshua Freeman 完成的
I took it apart, cleaned everything plastic, didn't risk cleaning the board with my current knowledge.
由 Discarded Couch 完成的