Powering USB RGB LEDs via HDMI or Displayport?

[Sin Stalker]

Is this possible? I have usb powered rgb strip behind my monitors. I just got a replacement for my malfunctioning center monitor, but it doesn't have a usb port to power the strip. The new monitor has hdmi, display, vga and dvi.

 

Can any of these be used to power a usb rg strip? 

[Mira Yurizaki]

No, because they don't carry power.

[Sin Stalker]

On 5/9/2017 at 3:45 PM, M.Yurizaki said:

No, because they don't carry power.

I was under the impression that some do.

[Mira Yurizaki]

39 minutes ago, Sin Stalker said:

I was under the impression that some do.

They may carry USB data, but not power.

[johnny5c]

8 hours ago, Sin Stalker said:

I was under the impression that some do.

 

7 hours ago, M.Yurizaki said:

They may carry USB data, but not power.

HDMI has a 5 volt line but it has nowhere near enough current to power a LED strip.

 

[Space Reptile]

40 minutes ago, johnny5c said:

HDMI has a 5 volt line but it has nowhere near enough current to power a LED Strip.

but enough for a chromecast ... wich shud be more than a few mA

[Mira Yurizaki]

3 hours ago, Space Reptile said:

but enough for a chromecast ... wich shud be more than a few mA

Chromecast uses USB for power.

 

[Space Reptile]

4 hours ago, M.Yurizaki said:

Chromecast uses USB for power.

[Mira Yurizaki]

@Space Reptile

If you want to add another one, yes there is a 5V line and the HDMI spec requires it to provide a minimum of 0.05A, but this is mostly for active HDMI converters or repeaters so you can have them in the cable.

[Sin Stalker]

Cool. Thanks for the info. I went ahead and ran a usb 2.0 extension behind my monitors, with a hub at the end to power the chromecast and leds. Works fine but now I can't turn off the LEDs behind the monitor by simply turning off the monitor. Maybe I'll spring for a hub that has switches.