On this new Sony Bravia XBR65X850D running Android TV 6.0.1, I go to Settings -> About -> System Update -> Check for a system update...
...and it searches forever. For hours and hours. I ultimately have to cancel out. I know it's a new set, already running Android 6.0.1 Marshmallow, and doesn't have a pending update (yet) but it's weird that the UI doesn't simply report that. Why does it keep searching without giving up after a certain amount of time? This same behavior happens even after a complete Factory data reset. And I know my network connection is solid and strong; every other app and streaming service working fine.
And so I ask: anyone else with the X750D (or X700D or X800D,) are you experiencing the same? Is there some other "trick" to get Android TV to successfully check for updates, even when one might not be pending?
I had the same issue with my Nexus player. It turned out the system time was set to manual and was not correct. Try changing that.