Example:
1. My TV is initially turned off.
2. I cast Netflix to my TV via Chromecast.
3. My TV turns on.
Is my phone sending the signal to turn the TV on, or is it the Chromecast that does that action?
What’s the network protocol being followed here?
In: Technology
basically even when your TV is off, it isn’t completely powered off. it’s just in a state that’s has circuitry powered on waiting for a command to turn the rest of the TV on. that command can come from the remote control sensor or from one of the devices that’s connected to the tv.
It’s your Chromecast turning your TV on.
There’s a feature of HDMI called CEC (consumer electronics control). This lets HDMI devices control each other.
The specific command it’s using is
>**One Touch Play** This allows devices to switch the TV to use it as the active source when playback starts.
Most manufacturers have their own name for CEC, such as Anynet+, Bravia Link, Viera Link, etc
I don’t know about Chromecast specifically, but HDMI devices can send a signal to TVs to turn themselves on and select the appropriate input when the HDMI-connected device is powered on or awakened from a sleep mode. For instance, I have a switch dock hooked up to my TV, and when I put my switch into the dock it turns the TV on. Similarly, when my PS4 turns on it will switch the input to itself and turn the TV on if it’s off.
Some smart TVs are wifi enabled so you can actually tell your phone to turn on your TV, and that would just be a wifi connection to the computer in your TV and sending a remote start command.
In all of these instances, the TV isn’t “off” like we turn off a light, and a physical switch breaks the connection of electricity between the wall and the light bulb, but in a low-power state where all it is doing is waiting for that “hey, get turned on” signal to be sent to it on any input where it allows that. Computers can typically do similar things if you set them up to do so.
Hdmi cec protocol. Hdmi devices can send command signals to each other. Your chromecast is waking up your tv.
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