Hello, I have an RPI4B which I would like to use for 3D printing. Now I'm running into a problem: the PI will only boot if a single controller board is connected. If I connect a second controller board, it won't boot. The only thing that happens is that the red LED lights up. I've read that the PI4B has problems with reverse voltage on the USB. I've now disconnected VCC from the USB, but the problem persists. I've tried the zero w2 RPI3b, RPI3b+, and RPI5. Booting works fine with these. Is there a solution to the problem with the RPI4B?
Statistics: Posted by Tkaus — Wed May 14, 2025 7:49 am