Horizontal lines on the screen after replacing the battery.

I replaced the battery of my 2015 iPad Pro (A1652).

Everything is working great but the top 2cm of the screen are now broken and it’s only showing horizontal lines.

At first, not even the touchscreen was working but I fixed it by disconnecting and connecting it again.

That makes me think that maybe the lines on the screen could be a connection problem between the screen and the logic board instead of a broken screen.

Can somebody with actual knowledge tell me if that is possible?

I was extra careful when I was detaching the screen (I even used a hair dryer) so I’m pretty sure that I did not break it… Although I’ll trust you if you tell me that I did haha.

Maybe I overheated the screen? Idk… send help :’(