It's worth noting that every TV manufacturer calls its CEC technology by a different name. For example, LG calls its HDMI-CEC ...

They let you connect all your HDMI devices — games consoles, Blu-ray players, AV receivers, cable boxes, streaming devices — to a single HDMI connection on your TV. That cuts down on cable ...

An HDMI (high-definition multimedia interface) is a set standard for transmitting audio and visual signals of the highest quality between various devices. It is commonly used in home entertainment ...

Disconnect the HDMI cable from the monitor and the connected device. If the issue continues, repeat the process but try a different HDMI input on your TV to see if this improves the situation.