crwdns2893792:0crwdne2893792:0 Christine Rodriguez ,
I just had this same large black stripe going down my tv and I contacted Samsung, they had me do a power loop. Unplugged all devices, unplugged tv from surge protector for 60 seconds, then plugged tv into wall, plugged each device in one at a time to see if it came back. Then turned off tv again, and plugged back into surge protector. The black stripe is gone.