I've been wondering about buying an LG 23ET63V touch screen monitor.
Although the manual doesn't mention the touchscreen usb output specifications, I was wondering if anyone knows whether this could be sufficient to both power a Raspberry Pi 2 and output the touch signals?

The point would be to try and eliminate the Raspberry's power adapter altogether.

  • 4
    Powering an upstream device is a violation of USB specifications.
    – Ignacio Vazquez-Abrams
    Commented Feb 29, 2016 at 7:20
  • 1
    Agreed. You'll probably get in a loop when the monitor goes to sleep due to no activity from the Pi, shuts off the Pi and, well, that's all.
    – Transistor
    Commented Feb 29, 2016 at 7:24
  • 1
    Raspberry Pi can accept power through the type A sockets, but I doubt that the monitor provides power through the type B socket used to access the touchscreen. if the monitor has an in-built USB hub that could perhaps be used to power the Raspberry Pi
    – Jasen
    Commented Feb 29, 2016 at 9:35

2 Answers 2


The USB socket on your monitor is designed to accept USB B plug:

enter image description here

This type of plugs is only used on slave devices, and it's almost certainly protected from back-feeding any electrical power back to the USB master. It's very unlikely you will get any current out of it. Depending on the design, it may even require the RPi to provide some electrical power for the touch screen to function.

  • 1
    While this is correct, I already encountered touchscreen monitors which had an USB-A socket and an USB-A<->USB-A cable in the box. Made in China. Sigh.
    – Janka
    Commented Oct 24, 2016 at 15:46

USB outputs are typically limited to 500 mA, whereas the Raspberry Pi, especially version 2 and 3, need more than that.

  • limited per specification, sure, real life not so much. Most hubs (which one would expect to be integrated in said display) usually do not care much for this part of the spec.
    – Ghanima
    Commented Dec 27, 2017 at 17:26
  • Ports that are designated as "charging ports" will exceed the spec.
    – tlhIngan
    Commented Dec 27, 2017 at 19:08

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.