Found Sony TV hdmi input settings for “enhanced 4K” turned off. Turning on “enhanced 4K “ for these rebooted Android on the TV, and Roku picture/sound returned. Thank you Community members for suggestions leading to this solution.
“The new 9.1 release hit my Roku Ultra and both picture and sound through my AVR disappeared. Gone. Dead. Testing found the Roku works fine if directly connected by HDMI to the TV. That’s how I discovered it’s been updated to system 9.1. No settings changed on my AVR (I checked), it’s mapped exactly as before, it’s set up exactly as it was when the Roku worked.”
"trekkeriii" wrote:
He's been posting here about his/her issue: https://forums.roku.com/viewtopic.php?f=28&t=153006.