Pi4 + Libreelec + WS2813 = low voltage on gpio

Hi all,

since few weeks i have strang problem.

I'm using Pi4 with level shifter (as described here https://learn.adafruit.com/neo…ry-pi/raspberry-pi-wiring).

Everything works great untill now.

I see when, for example refrigerator starting, led make one flash at refrigerator starts, and pne flash when stops.

I measured voltage on gpio21..about 0,6v. I changed gpip to gpio19 on Hyperion management page, and this same voltage 0,6v as before on gpio21.

Then I force pull up gpio21 to high, after boot voltage 3,3v and on level shifter 5v

If i change on Hyperion gpio back again from gpio19 to gpio21 voltage again fall to 0,6v.

Could some on tell me what happend in my envairoment?

I use Libreelec v19.

Hyperion Aplha 9.

Pi4 4GB.

Hi, something similar to your solution. Rise signal as yours from 3,3 to 5v. Works well since january.

But I'm wondering why I have 0,6v on gpio pin when mesured direct on Raspberry pins.

I have never before measure voltage on pins but I always thinking that should always be 3,3v. Am I right?

Abut below picture. 0,6v mesured between blue and black.

Thank You for your time and tests.

Last question...what kind of level shifter vcan handle high currents?

Something like this on your picture?

I will try send Pi on warranty or buy new one