The SKR board problem is indicated by when the switch is pressed 1) the LED light for the endstop coming on and 2) the M119 g-code indicating the endstop is “Open.” If your situation doesn’t match both of these criteria, you need to look elsewhere for your problem. If your problem matches, your choices are:
- Exchange the board (only a very few boards seem to exhibit this problem).
- Disable or remove the LED light for the endstop(s). This can be done by unsoldering the LED or by cutting the trace to the LED with a sharp knife.
- Adding pullup resistors to increase the voltage when the switch is high:
Most people who have this issue elect to add pullup resistors. These can be added by soldering the resistor directly to the SKR Pro board, or by adding the resistor to the wiring connection.
Here is the first topic where the issue was identified.
Here is a topic where the resistors are soldered to the board.
Here is a topic where the resistors are added to the wiring.