With our Original Prusa i3 MK3, we have introduced a brand new logic board called Einsy RAMBo. Compared to its predecessor, it works on 24V and uses Trinamic drivers for motors, allowing for super silent printing and much more.
Organizing all the cables can be a bit challenging, so we recommend you take your time. If there are any issues with your printer's wiring, they will be most likely discovered by the Selftest failed (MK3/MK3S/MK3S+) or when running the initial Wizard. For more information about the cable-management, we recommend checking Electronics assembly of the assembly manual.