[Problem] Ender 3 Pro Z-Axis not moving while Autohome

[V00D00]

Hi I found this forum here while I was looking for a solution for my problem.

I own a Ender 3 Pro with a Cheetah 1.2a silent board, BLTouch V3.1 (not a clone) and Marling Bugfix 2.0.x. I was designing a case for the motherboard so I can store it on the backside of the printer. So far the printer was printing absolutly fine without any issues. So yesterday I cut of the protruding PINs for the display cable on the back of the motherboard.
They've disturbed the fit of the new case. I wasn't able the use the wheel on my LCD so I had to fix one cold join with a soldering iron.

After placing the printer on the shelf back I wanted to start a new print but recognized that the printer is doing everything beside of moving down my Z-axis while autohoming.
I tried everything out from flashing Marlin again on the board, checking all the connections and wirings especially for Z-motor and BLTouch. Everything is like it is before.
I can heat the bed, I can move X and Y axis, LCD is working fine, I can also move the Z-axis manually up and down BEFORE autohoming and error.

I really don't know why. I can't image that it has something to do with cutting off the protruding PINs on the back.
I attached a photo and a video. Maybe you guys have some idea. I don't think that the board is broken but I'm not sure anymore. Because I wasn't able to fix it after hours.