iPad Mini 3 white lines showing across two thirds of the LCD

Hello everyone.

I have received an iPad mini 3rd gen. from a friend for me to fix. According to him there are white lines showing up on the lower 2/3 of the screen. Apparently he was using the device normally, when suddenly in the evening those lines appeared. He always handled the device carefully, but the warranty has expired a few months ago.

I now opened up the device, and reseated the LCD connector, allthough it did not help. Is this a common issue and is there a way to fix it, or is the replacement of the LCD itself the only solution here? I've included a picture of the issue.

Many thanks in advance.