The first step of the process is to contact Nintendo. I went through its support site where it has a repair page, but nothing can be done here. It mostly offers troubleshooting advice. I did, however, confirm that all Nintendo systems come with a standard 12-month warranty, so my four-month-old Switch was covered.
Continuing my research, I discovered I’d have to call Nintendo to get the repair order started – there’s no other way. In case you need it, the Nintendo’s support number is 1-800-255-3700. Calling a Nintendo representative is as annoying as it sounds. The rep I got was doubtful my Joy-Con was having issues and suggested I continue using the faulty Joy-Con if it wasn’t affecting my gaming.
I held firm and told Nintendo I wanted my Joy-Con fixed, and after another roundabout of questions, they began the repair process. For this, I had to give him the serial number at the bottom of the Switch to verify my console was in its warranty period. (It was.) Anecdotally, I was also asked if I minded receiving a different color Joy-Con. Seeing as this would eliminate the beautiful two-tone Neon scheme I loved, I said I did mind and I wanted the same color back.
He then told me was going to send me an email with the shipping label included. If you are as impatient as I am, be warned that the email may take a while to be delivered. Don’t contact Nintendo saying your shipping label was never sent five minutes after you got off the phone and demand a new one.
About thirty minutes later, I received an email with the shipping label and directions for the return process. You must only send in the affected product. That means if you are dealing with a Joy-Con issue, only send in the Joy-Con and not the whole system.
The rep also informed me that if the repair specialist deems the product to have physical damage outside of the warranty coverage, it will be sent back without being repaired.
The email contained a link to my specific repair account that could be accessed with the repair number and shipping number. This will let me know when Nintendo receives the product that’s sent in, fixes it, and sends it back.
Article source: https://www.technobuffalo.com/2018/03/24/nintendo-switch-controller-repair/