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for my current project I need to supply the Pi via the GPIO pins with power. I know that I'm bypassing some security features, but my circuit has new ones implemented.

The problem is, that I'm hocking Pin 2 to 5V + and Pin 6 to GND. The Pi turns on and uses 800 mA. But I don't get an HDMI signal, and the Ethernet port is also not working. I already tried adding "hdmi_force_hotplug=1" to the config.txt. Is it a coding "problem" and how can I solve it?

HDMI/Ethernet work when I power the Pi normally, via USB, that's why I'm confused.

I use a Raspberry 4B 8GB RAM

I had a look on HATs which supply the Pi via GPIO. The only extra think they have, is a Load Switch. Could this be the solution? HAT: https://www.tinkerforge.com/de/shop/hat-brick.html Load Switch: TPS22975

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  • Yes it does. Thats why i'm confused.
    – Andreas
    Commented Sep 20, 2022 at 6:38
  • I added this info to the question. I know it's obvious to you, but it's absolutely not for other people, and just asks for irrelevant answers such as "check your cables" etc.
    – Dmitry Grigoryev
    Commented Sep 20, 2022 at 7:03
  • Now, 800 mA can be too much or too little, depending on you Pi model. It sounds like a reasonable current for a Pi 4 with no CPU load. Is that so?
    – Dmitry Grigoryev
    Commented Sep 20, 2022 at 7:04
  • But as far as I understand it, the Pi takes that Current that he needs.
    – Andreas
    Commented Sep 20, 2022 at 7:06
  • 1
    I use a Raspberry 4B 8GB RAM (Added the Info to the Post)
    – Andreas
    Commented Sep 20, 2022 at 7:13

1 Answer 1

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You need to supply more power.

Your power supply to the GPIO is clearly inadequate.

It could be the wires used or the power supply or poor connections. We can't guess which.

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