Chosen Solution
Could the ribbion cable cause it?
Hi Henry, Okay, biggest sign I see right now is that the ribbon cable that’s mounted on the joycon rail is supposed to be connected to the motherboard, so if it came out when you removed the rail then it’s definitely not connected any more. Assuming it’s not like torn in half, you’ll need to open up the Switch in order to reconnect the cable. The rail, connector and flex cable all come as a single piece, so if you have to replace the cable that’s what you’ll end up buying. Here are the parts, depending on whether you need the left, right or both rails. Nintendo Switch Left Joy-Con Sensor Rail Nintendo Switch Right Joy-Con Sensor Rail: Replacement Part If you take a look at the replacement guide for the sensor rails you’ll see where they’re supposed to be plugged in and what the cables should look like so you can tell if they’re damaged or not. Nintendo Switch Left Joy Con Sensor Rail Replacement - iFixit Repair Guide Nintendo Switch Right Joy Con Sensor Rail Replacement - iFixit Repair Guide If you’d like, you can post some pictures of what you found when you removed the sensor rail and we can take a look and see if we can tell if it’s damaged or not. This guide will show you how to edit your post and add pictures. Adding images to an existing question - iFixit Repair Guide
