Sony! I has a 43 of those fine imperial inches, 4K Android TV, bought in late 2016. I've got crap hearing, and many programmes have widely varying volume levels including lots of muttering (Yes, you, BBC and Silent Witness). Therefore I thought, Oh, I have excellent Aftershokz bluetooth headphones, the TV has bluetooth, I'll use those, so Mrs W can have normal level (she can hear an ant fart 3 miles away) and I can have direct to the bonce input. Goes into setup menu, "pair new device", put headphones into pairing mode, put telly into pairing mode, searching for new devices. it just sits there and finds nothing. I Google the issue this morning, to find many Sony tellys do not have the required A2DP profile. I spend ages finding the specs online (not in the 16 page 20mm thick 400 language manual), to discover it has the profile for pairing bluetooth 3D glasses (it is NOT a 3D TV), but not headphones... Grrr! Apparently the voice command thingy via the remote, is bluetooth, which was news to me, and that works fine, just not the obvious thing you might want to connect.
What the ****ing hell is the point of having a 3D bluetooth profile on a non 3D telly, but no audio profile?
It ranks on a par with Sony's inability to make a home cinema amplifier that could read the audio stream from an SACD played on one of their own blu-ray players. I had to buy an Onkyo amp in the end.