Some Samsung phone's can suffer from a vertical line on the phone's display which is typically a failure of the connection between internal board and display which can only be fixed via a new screen being fitted.
i.e something similar to …
Is that what you mean @mushdub ?
This happened to one of my phone's which Samsung repaired within warranty.
Daily Driver > Samsung Galaxy s²³ Ultra 512Gb in Phantom Black.The advice I offer is my own and does not represent Samsung’s position. I'm here to help. " This is the way. "