Installed a replacement screen - Vertical flickering issue
See this video: https://streamable.com/ktkw1
This only happens when the screen is turned on, either when the phone is booted up or awaken from sleep. This issue happens for a few mins then it goes away. The screen looks fine afterwards.
Touchscreen functionality is OK.
I would like to know if this is a defect in the replacement screen or something I messed up during installation i.e. connection etc?
Can someone also explain what is causing this issue? And why does it go away after a few minutes?