Originally Posted by billmich
What causes ARC to stop working in the first place?
Probably HDMI issues.
HDMI has lots of problems with device certification and interoperability.
The CEC function that facilitates ARC, may be handled a certain way by Yamaha, and a slight difference by another company be it TV or AVR, etc.
"Previously, this two-way data transfer only carried handshake info, to tell the source things like “yep, I’m a TV” and “nope, I’m not stealing your content,” or CEC control data. CEC, or Consumer Electronics Control, let you control multiple devices with one remote… in theory and as long as they were connected with HDMI and had the CEC feature. This never worked in reality as well as it did on paper, with cross-brand compatibility being hit or miss. ARC uses aspects of CEC, letting you adjust the volume on a soundbar, for example, with the TV remote. In most ARC products, the soundbar and TV essentially act as one device, with just a single button push to power them both on (no programming required)."
"Because there isn’t much consumer awareness about ARC, there isn’t much push on the manufacturer side to hype it. You’ll see mention of it, of course, but hardly ever any details of how it is implemented, and on how many HDMI inputs. Some have ARC on HDMI 1, others have it on HDMI 2. The truth is, it doesn’t matter which HDMI has ARC, as long as you know which one. Many TVs, once you get them out of the box, will identify which HDMI connection has ARC.
How it’s implemented, though, is much harder to determine. According to HDMI Licensing, it is up to the individual manufacturer to choose how to apply ARC. This creates a level of confusion in the market, as it is difficult to determine if the TV only outputs its own sources over ARC, or whether it sends other connected sources as well."
http://hdguru.com/what-is-hdmi-arc-and-what-does-it-do-for-your-hdtv/Edited by CaptainVideoJW - 8/27/13 at 7:34am