After sept 23 update CEC won’t turn tv

Hi, Tim. My name is Ron, I'm an independent advisor. I will be more than happy to help you.

Make sure to check first if your TV support the HDMI-CEC feature which sends commands to and from CEC-enabled devices (such as TVs and AVRs) that are connected to the console.

To turn off the TV along with the console, please do the steps below using your console.

Press the Xbox button  to open the guide, then go to Profile & System> Settings > General > TV & display options > TV & A/V power options.

You will need to turn on the HDMI-CEC function there, please also make sure that HDMI-CEC is also enabled on your TV settings.

After setting all of that up, on the TV & AV power options screen check the HDMI-CEC box to activate CEC then turn on the following setting "Console Turns off other devices."

Hello Sean, sorry to hear you're having trouble with the TV and console.

This sounds like you have HDMI-CEC set up on your console. This will allow the console to turn the TV on or off when you turn the console on or off.

It's possible that the console has not fully shut down when you turn off the TV so it could be getting a false 'turn on' signal from the console. I'd suggest waiting a moment after turning off the console to turn off the TV or turn off the HDMI-CEC setting on your console.

It's probably due to the TV sending a
CEC signal via HDMI.

Check if your TV has a setting to turn these CEC functions off. However, most TV makers don't call it CEC, but something fancy like VIERA Link, Anynet+, Aquos Link.

Turn off those CEC commands, and your Xbox should stay off when you start the EPG.

Don't count on Microsoft adding HDMI-CEC. That would require you to turn on your cable box first and not the X1. And that assuming cable boxes have HDMI-CEC capabilities (I don't have cable so I don't know, but my HD antenna converter box does not support
CEC). Unless they somehow send a distinct IR signal to the cable box and use HDMI-CEC through the X1 to the TV/audio receiver. And isn't HDMI-CEC send the signal up to turn on and comes down to turn off. Wouldn't that mean you'd turn your X1 on to turn your
entertainment systems all on and have to turn your TV off to turn everything off?

Something else to check out is if your tv has a feature called CEC, it may be called something else on your TV. Heres a link with more information regarding CEC ( Consumer Electronics Control )

If your tv does have this feature then try turning it off please.

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en.wikipedia.org/.../Consumer_Electronics_Control