Why does my phone screen appear to be black until I apply pressure?

I have an iPhone XR that has had multiple screen replacements, however the most recent replacement started giving me problems such as a blank screen. The screen responds to my touch but is blank. As I was messing with my phone I started to apply a bit of pressure to the phone screen and the display appeared. I was able to see my wallpaper the time and about everything else that is on the Lock Screen, but as soon as I released the pressure it went back to being a blank screen. Any help? Thank you.