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PI4 usb power port
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PI4 usb power port

by saltpoint3289 on Sat May 08, 2021 12:05 pm

Purchased PI4 in February 2021, attached the PI Foundation 7” touchscreen (2718). Yesterday the power port was lose and in a very short time fell off. I am weak in soldering little teeny tiny areas so I am looking for an alternative. I have tried to use the power supply port of the display - the pi led shows red and nothing else happens. No green led, no display. The gpio connections between pi and display are simply ground to ground ; 5v to 5v.

1) how can I make this work?

2) is there another solution that does involve soldering?

Thank you, Cynthia LaPier

saltpoint3289
 
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Re: PI4 usb power port

by mikeysklar on Sun May 09, 2021 8:00 pm

Hi Cynthia,

You could add a POE Hat (Power over Ethernet). It is an elligant solution to have your data and power come into the unit over one line. It does require a POE enabled switch.

https://www.adafruit.com/product/3953

Another option would be to use the Pi header pins #2 and #6 to feed in the appropriately sized power supply 5v / ~3A would be ideal for a Pi 4.

https://www.raspberrypi.org/forums/view ... 3#p1515411

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Re: PI4 usb power port

by saltpoint3289 on Mon May 10, 2021 10:16 pm

Thank you for the suggestions.

I will be suing this setup in the field with my telescope so POE won’t work.

I am going to work on the GPIO idea.

I really wanted to use this display as it has a separate us power port if it can share with the RPi - why wouldn’t it work in reverse?

Thank you

saltpoint3289
 
Posts: 9
Joined: Thu Jan 31, 2019 10:47 pm

Re: PI4 usb power port

by mikeysklar on Tue May 11, 2021 9:32 am

The power pins exposed on the 7" display should work. I think those are worth trying. The only concern would be that the traces are not large enough to carry the required current to run the Pi and the display.

I was only able to locate two mechanical design files and installation instructions for it so I was unable to confirm how much current the 7" display board can handle over those external connectors.

https://www.raspberrypi.org/documentati ... e/display/

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