iPhone 7 vertical lines

Hi all

Have here an Iphone 7 which was dropped in the bath (kids!!) took it apart and cleaned motherboard amongst other parts with osyprinal and replaced the screen, all cam back to life and no issues for a few months, until now she dropped the phone which did not damage the screen in any way, however the screen is showing lines now, touch still works, I have changed the screen to see if that would sort it out but still with the same issue, see attached.

Any pointers would be appreciated.