how to prevent baby

ashbash4 • Mommy to Carl and Cora; LOVE THE LIFE YOU LIVE; fuck what anyone says
Does anyone know how to prevent baby from messing with the wires behind the tv?? My son is obsessed and sits there and pulls the wires. I've tried telling him no and it doesn't work. I've even smacked his hand (softly but firm) to tell him no and he still does it. I'm trying to block it off but I can only do so much.