I had a problem similar to this. The probe would deploy but not do anything, rewired it correctly and then the probe would not deploy. The sensor inside the BLtouch was cooked. Had to replace the BLtouch. The CRtouch or Biqu microprobe are options as well the the BQ v2 being the least of the 3. I hope that isn’t it, but at least your system board isn’t cooked.