Radek

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When reading various discussions, I think that the SKR mini E3 V3 board has a big problem with electromagnetic interference. I would try urovant wiring. Use a shielded serial cable...

you can make it yourself from an old mouse cable 

XH2.54

Busy is not an error, it is a message from the printer that it is busy with some activity and is not accepting further commands.

Yes, the serial communication debugging function is integrated. It is disabled by default. To activate it, you have to turn it on in the Configuration.h file and compile your own...

I don't know. I have never tested this feature.

> how did you solve it? Try setting a lower communication speed on the serial port https://github.com/bigtreetech/BIGTREETECH-TouchScreenFirmware/issues/2761#issuecomment-1509852484

If the display just lights up and shows nothing, try this: In the file: Marlin\src\lcd\dogm\marlinui_DOGM.cpp change parameter: void MarlinUI::_set_contrast() { u8g.setContrast(contrast); } change to: void MarlinUI::_set_contrast() { u8g.setContrast(255); }

@romass The setting of your NEOPIXEL parameters does not correspond to the recommendation in the display manual.