this post was submitted on 09 Oct 2025
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I don't know shit about cables but it's plugged into a monitor. My intuition is that a monitor shouldn't be pushing power out through a video input port.
DisplayPort has a +3.3V 500mA pin specifically for pushing power. In theory, great for powering an active adapter. In practice, has killed motherboards because Dell can't design a computer for shit.
Friendly reminder that if you use a Dell charger on a HP, nothing happens but vice versa, you damage the motherboard. It kills a chip used for charging. Dell used the same size barrel jack, but they wired it differently from everyone.
The monitor has to send some data to the computer to tell it what screen resolutions it accepts. VGA, HDMI, and DisplayPort will all do that for sure. Less certain about component, composite, and S-Video.
Pin 9 on VGA is 5V out.
Signals aren't magic, they consist of electrical power. You can get at least a little bit of power from anything that isn't an optical port.
You cannot charge a phone off "a little bit of power".
Technically, even an optical port can deliver power. Light is just a particular form of electromagnetic wave that just happens to use another method of transmission (and you might need a different mechanism to transform its energy), but it also has an intensity, potential energy and resistance in the medium of propagation.