How to tell if hdmi cable is cec
Nionne ollie
Disconnect any components in the HDMI signal path and connect the HDMI source device directly to the TV input. If the TV then works, you will know that one of the disconnected components or HDMI cables must be at fault. You can start reconnecting cables and components one at a time.
The onboard HDMI CEC controller that is controlled from the BIOS, supports bidirectional power on/off control for TV and NUC. So you can NOT use the remote with the built in CEC. PREVIOUS ANSWER (more in depth):