I've read many, many other posts and not found any solutions that work. I'm a bit of an audio newb and not following all the language.
Using a TCL 55" series 5 QLED, trying to connect to my Denon AVR-S720W receiver.
Connected HDMI cable (tried 2 different cables) to ARC on both TV and receiver. Turned TV speakers off. Tried auto detect, Dolby Digital, Dolby Digital Plus, Dolby Digital DTS. Set CEC to eARC and 1-touch play checked in System.
Thank you for your reply! I have a Devon Amplifier that I am trying to connect to the TV, but nothing seems to work. I read and watched a number of guides and videos about the steps, including the one you just suggested. I excluded the possibility of a faulty cable or connection as well.
I have all the options for Arc HDI enabled. When searching for CEC devices, the Amplifier is just not recognized at all.