Yup. Same here UN40J6300. Worked perfectly till the Wed night/Thu morning 11/25 update and then HDMI issue! (unplug/ plug from ac works as annoying workaround. at least that's something)
!asted 2 hrs on phone on Thanksgiving. Reset, remote access, no change, yada yada. Asked for Supervisor, who told me in 2 minutes it was a known bug in the firmware 11/25 & they are working to create a patch. He was actually nice. I told him to tell the fron tline phone reps this so as not to waste everyone's time. He actually agreed and apologized. Cold comfort. He gave an eta of Mon 11/30. We'll see
Anyone seen a patch yet?
Oh, did an online chat yesterday Sat 11/27 to check on patch. Gave the rep my service case # and indeed he admitted right away that it was a known firmware update bug and a patch is needed. no ETA from him.
No excuse for this at all. someone needs to be fired for this.
Good luck to all. Let's keep on them!