CEC is a control channel carried inside the HDMI cable: it lets one remote switch inputs, adjust volume and power devices on and off across a whole system. It fails most often because it is switched off somewhere, under a name you did not recognise.
Why it looks unreliable
Every manufacturer renames it. A television with “Anynet+” disabled and a soundbar with “HDMI Control” enabled will half work, and nothing in either menu suggests the two are the same feature.
The order to fix it
Enable it on every device in the chain, by whatever name each one uses. Then set the television’s audio output to the external device. Then test one function at a time — volume first, because it is the one people actually want.
The failure that is not CEC
A device connected by optical cable will never be controlled this way: optical carries audio only. If the volume has to be adjusted on a second remote, check what the audio connection actually is before blaming the setting.
When to leave it off
When the automatic behaviour is worse than the manual one — a television that switches itself on because a console woke up, for instance. It is a convenience, and switching it off is a legitimate choice rather than a failure.
Questions people actually ask
What is it called on my equipment?
Almost anything. Anynet+, Bravia Sync, Simplink, Viera Link, EasyLink, Regza Link and several more are the same standard under manufacturer names, and they have to be enabled on every device in the chain.
Why does my television turn itself on?
That is CEC working as designed: a source device waking up tells the television to switch on and select its input. It is a setting, and it can be turned off on the device that is doing it.
Last reviewed 4 September 2026