Originally Posted by mikey94025
I have a different Marantz receiver and a Sony TV connected via HDMI-CEC, but AFAIK
CEC only links the power and volume controls of your TV to also control the AVR. CEC doesn't change what your TV power and volume remote buttons do (to the TV) and it shouldn't do anything to the other buttons on your LG remote.
CEC is a public domain protocol, and pretty much every single manufacturer has 'customized' its features on their own stuff, making it a very difficult protocol to use consistently and reliably.
Manufacturers have dropped or modified features and commands, and added others which they won't document designed to work when the interconnected gear is all from them. It is unpredictable and crude, especially
when it comes to things like switching AVR inputs around.
On my bedroom setup (Sony 900E, Marantz 1608, Amazon Fire), it took a while to work out how to get the TV turning on-off to turn on-off the Marantz (works about 80% of the time), and how to get the Marantz to switch to the Fire input when I hit the Home button on the Fire's remote (works about 90% of the time). Having the Marantz switch to the ARC mode when I fire up one of the 900's internal apps has generally been hit and miss.
In my main setup, I just gave up and use a programmable remote and a smart power strip to control power and routing. The CEC implementation between the LG OLED, Denon AVR, Fire TV, and Samsung UHD DVD was just totally random and unusable.
There are literally thousands of post all over AVSFORUM complaining about CEC.
I'd like to see a universal CEC 2.0 protocol, perhaps designed and implemented by the no nonsense HDMI consortium (or someone else - I don't care), with well defined commands, and the statement that this is the protocol, implement it or don't, but you can't change, or extend, or add, or fail to implement any
of the commands. It is the only way to bring some sanity to the craziness.