Thanks for your note. Very similar circumstances for my setup. I originally had the TV paired with a Sony STR DN850 and it worked well for ~2 years. About 6 months ago the ARC function simply stopped working. I swapped out the Sony with a Pioneer VSX-LX303 and that didn't work either. I have scoured this board and others and your solution, to power everything down, wait for 10 minutes for volatile RAM to erase and then power back up was fairly common but it has not corrected my problem. I've tried several other things and unfortunately none fixes the issue. Looks like I'm stuck with a 'dumb' TV that only effectively works with a single HDMI input from my AVR.
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Hello. I have read every thread on this topic and not located a definitive solution so am posting to see if there has been an update. I have a UN65MU800 series TV purchased in 2017 and a new Pioneer Elite AVR. The HDMI-ARC function is not operating properly with the return audio to the AVR. I have my Verizon cable box routed through the AVR to the #4 port on the TV One Connect and can hear that audio, but when I switch the source on the TV to a native source such as Netflix, Prime, etc. it does not return that audio to the AVR. An attached TOSLink cable to the AVR works but of course the sound quality and format options are limited as compared to HDMI. I have powered everything down, swapped cables, reset both TV and AVR, turned ANYNet on and off, verified the latest firmware (1280.5), etc., with no joy. I tested the AVR with another TV (Sony Bravia) and the HDMI-ARC function works flawlessly. Any new guidance on how to address this?
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