Issue with z axis switch

Hi,
i have a problem with axis z end-stop.
The printer doesn’t stop trying to move again although is a 0.
Replacing the PCB doesn’t work again.
I try to change switch for z-motor and all works fine and the z-switch with x and y motor doesn’t stop.
With a tester i see 0V on the board z-end-stop connector, it seems a defective board.
How can I fix without change board??

If you are positive that the board is defective, then we are afraid you will have to return the board for inspection/repair/exchange.
If you try to fix the problem on the board yourself, then you will loose your warranty, so it is better to return it.

Please return it to your distributor or direct to:

Velleman Projects Tech. Dept.
Legen Heirweg 33
9890 Gavere
Belgium

Make sure to include a detailed fault description.