Custom firmware and CEC?

So presumably the TV's HDMI port(s) circuitry must be powered when the TV is on standby?
 
Only the CEC line needs to be powered, presumably the rest of the HDMI circuitry will be shutdown to save power.
 
It wouldn’t need to be fully active anyway - just a low-power circuit to detect any activity and wake up the next stage of processing. That’s typical of a micro-controller circuit (just sits in a low-power state waiting for an event to trigger a burst of processing).
 
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