this post was submitted on 09 Oct 2025
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Yeah but is the voltage correct? It should be 5V to charge a phone over USB, is that part of the VGA spec?
With USB power delivery, you can get 9V, 12V or higher over USB. Usually the device requests higher voltage from a PD charger, but it's not impossible for a modern device to be able to cope with just having 12V shoved into it.
The USB device would have been made wrong if it just shoved 12V down the power lines without negotiating it.
That's probably only true for USB power supplies - a USB adapter isn't set up to do anything with voltage and probably just passes the positive and negative pins through.
The VGA adapter feeding power back through USB in the first place, yeah, that's not supposed to happen.
Put it this way, either the standard on the other end of the adapter specifies 5V, or the adapter doesn't just pass it through, or the adapter is broken!
Doesn't matter. The VGA to HDMI adapter is active, not passive, so it matters if HDMI has a 5v rail, not VGA
If, hypothetically, VGA didn't have a 5v rail then how would power get from the monitor to the HDMI adapter. It would absolutely have to be a part of the spec.
It doesn't need to be 5v. An active adapter can have a buck converter.
In reality active HDMI adapters get powered by the HDMI device though, not the VGA monitor, so it's a moot point anyways
If the vga/hdmi adapter is active then this abomination could actually pass display information provided you had a micro-usb device that supported display out over usb (idk if there is such a thing and if so it probably doesn’t work all that well but still)
Yeah I don't think there's a 5V pin for VGA.
I think if we had the scenario where we had a higher voltage than needed, we could have a toasty voltage regulator making something happen, but going the other way would need boost circuitry unlikely to exist in these parts, in my understanding
There is! It's pin #9
Ah my memory failed me then! Thanks for the correction, I guess this is technically possible then!