I see, that's pretty clever ! Sadly, they've never made used of it :/

What you broke is handling the NFC, and doesn’t have anything to do with the display. You probably damaged the ribbon right below the battery, since that’s what links the display to the motherboard.

Une petite pastille qui change de couleur au contact de l’eau. Les fabricants s’en servent pour nullifier la garantie : si ta pastille indique que de l’eau s’est infiltré, tu devra payer ta réparation.

With the Nintendo servers now off, and all the games are playable without WiFi. That being said, I don’t know what is used for local multiplayer.

Soit un changement de batterie, soit la carte-mère a peut-être un court-circuit :/

From what I know, the only solution is to drill the screw out with a very small-headed drill :/