Chosen Solution
Same day ago i received my shell for joycon and nintendo switch. So yesterday i swapped the whole set and after i completed, i was trying all the stuff to see if there’s something that’s not working. At first i ain’t notice nothing but when i want to play wirelessly, i can’t use my right joycon and the light of the rail doesn’t blink. So i tried everything i could do to get this thing working, unsuccessfully. So battery and light of the rail are working, because i tested on other right joycon i have. Another thing i noticed is the battery of joycon which is at 3/4(when i tested in other joycon), is empty when shown in docked mode.
I don’t know if this will work for you, as I was missing a couple of issues you have such as the battery appearing empty and the light rail on the joycon not lighting up, but I had this issue too! Here’s how I fixed it. My right blue joycon wouldn’t work wirelessly but would work when connected to the switch undocked. So I went to the change grip/order tab under the controllers icon. I then held down the pairing button on the troubled joycon and it connected. Apologies if this doesn’t solve your issue.
nabbo saibot … sounds like your docks are working so we can move directly onto your joycons. follow these guides to troubleshoot. i would look at the sync issue first and then the battery as its giving you weird readings. also, being that you changed the entire housing, it is highly likely there is something that has become disconnected or wasnt connected fully when doing this. make sure you check all of these while you have it open. Nintendo Switch Repair
I’m having the same as you, changed the shell and show the same signs as you. swapped the batteries and still the same problem, no power. No rail lights and only works handheld (works 50/50 had to remove and put em back sometimes for it to register) battery indicator on switch also displays it’s low (red) even though I know it’s fully charged. Gonna try purchasing a rail replacement and see if it works. If anyone has an answer to this, would help us a lot.
Open your joycon up again and make sure everything is connected and plugged in. I just had this problem and found that one of the wires that connects to a square around the main battery was unplugged. I used one of my screwdrivers to push it back down so that it clicked and now it works fine. (I don’t know the all the words for controller parts so I have no idea what it’s called sorry.)
I was recently having this issue with my sons Switch OLED. The right joy con will work attached to the switch, but not wirelessly. It had not been taken apart I just figured he broke it somehow, he’s rough on things. I got a Switch OLED for Christmas, so I decided to try putting the known good right joy con from my unit on his to see if it would work. It work perfectly. I then put the joy con from his unit that is giving trouble onto my unit. To my surprise it connected and started working perfectly both on the unit and wirelessly. I then put the now working controller on his unit and it started working on the unit and wirelessly. I have no clue why that fixed the issue, but it did, at least for now. Maybe this will help someone else down the road.
