No output on RPi 3B+ despite working perfectly on RPi Zero 2 about rpi-rgb-led-matrix HOT 2 OPEN

Greetings,

When You upgraded your LED display, use the same "interface" (adafruit, regular, etc.) or just use cables?

If it is so, check your cables, for open cable, DO THIS first, put back your LED display on RPi Zero 2, it still working...? Best regards

PD. A picture of your connections and the command will be great.

from rpi-rgb-led-matrix.

Thank you for your reply :)

I'm not using any hats like the Adafruit one, just jumper wires and flat cables wired according to hzeller's tutorial. I replaced all of the cables used with RPi 3B+ and still nothing. When I put back my RPi Zero 2 the display works just fine.

Since I try to run demo first on the RPi 3B+, the command usually looks like that
sudo ./demo -D 0 --led-gpio-slowdown=3 --led-cols=64 --led-rows=32 --led-chain=4 --led-no-hardware-pulse --led-brightness=50

Never any errors, just blank display.

Connections:

The only difference is that in RPi 3B+ I skipped the jumper wires for two unused GNDs

from rpi-rgb-led-matrix.