I have a LG 65UF6450. The power off doesn't work if my Vizio sound bar is connected. But the sound bar turns on/off perfectly. Also if the apple tv goes to standby based on inactivity, the TV doesn't power off. I wonder if LG even supports power off thru HDMI CEC.
I wonder the same. As I've tried different HDMI cables with the same result.
If I turn off the LG tv using my receiver remote my receiver turns off at the same time as the TV. IF I turn off the receiver the LG tv does NOT turn off. So my guess is the LG has some sort of issue or doesn't support TV off thru hdmi cec as piecloud noticed.