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Hello everyone I am running into some kind of problem. I want to power my Pi 4B+ through the GPIO pins via a buck converter but it just wont work. I used the LM2596 non adj 5V buck. In its typical application form. dsf

And I also bought the LM2596 adj and set it with the potmeter that comes with it. It has a small voltage riple but stays within the 5% of 5V tolerance. And the third thing I tried was to supply it with my bench power supply. I tried al 3 cases with GPIO powering and via a stripped usb c cable but none of them work.

All tries end up with the red led staying on for a couple of seconds while the green led flashes but after that the red led dies.

My bench power supply can supply 4A at 5V and I even tried 5.1V as I read that the RPI adapter supplies that. Picture beneath shows PI 4B+ schematic.

enter image description here

I also tried a 3S High discharge battery but that didnt solve it. Picture beneath shows setup. enter image description here

I also measured the voltage while its been connected to the Pi. As you can see Vavg is 5.05V, Vmax 5.22V and Vmin 4.85V enter image description here

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  • Post a photo of your connections to the Pi. What diameter wire? Bench power supplies can't always react quickly enough for a Pi's power requirement. Have you tried leaving your power supply on then making a live connection to the Pi?
    – CoderMike
    Commented Mar 12 at 10:49
  • I have tried a battery instead of the bench power supplies it should provide quickly enough power to the pi. And I did try leaving the power supply on and making a live connection. I will add a picture of the current wiring with 3S battery. Diameter wiring is 1mm.
    – Luuk Benningshof
    Commented Mar 12 at 16:03
  • Can I see some twisted wire connections there - that is unlikely to work well - solder any connections. If connecting to GPIO use 2x 5V and 2x Gnd soldered to thicker wires.
    – CoderMike
    Commented Mar 12 at 18:32
  • Those are twisted and then soldered, but are the green and white cable from the usb c cable necessary I dont think so.
    – Luuk Benningshof
    Commented Mar 12 at 19:03
  • Most of your question is irrelevant as you appear to be using some (unspecified) converter. Many of these are low quality and if the PWR LED does not light it is obviously inadequate. You have not posted any voltage etc measurements.
    – Milliways
    Commented Mar 12 at 23:06

2 Answers 2

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I bought a 12v - 5v converter for a few bucks on Amazon, and used the connector from an 18650 LiPO battery on the 5v and Ground pins on my Pi 4b. I've got a 12v 5a power supply from a dumpster running power to the converter, and it works like a charm!

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    – Community Bot
    Commented Jun 10 at 15:36
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What fixed it for me was: I set the LM2596 adj to a higher outputvoltage of 5.1V. The power supply that the Pi came with is also set to 5.1V

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