Chosen Solution

I used the tutorial by ifixit to fix my left joycon but after I fixed it, my controller won’t work at all?. When I first detached the backing, one of the side cables detached but i reattached it. That is the only thing that I think I did wrong. I really need help, everyone else’s repairs seem to have gone good.

2 suggestions open it back up and check your ribbon cables for tears and missing pads and verify theyre seated correctly. post up some pictures of it opened for further help! good luck.