Problem with new screen

Hello,

I already replaced many LCD screens or batteries etc in phones, but today I experienced something strange:

I replaced the LCD of a Huawei P9 lite and afterwards everything worked fine. All parts have been working (touch, screen, cameras, finger sensor etc) and all software was fine.

Then after a while the touch was not working anymore. I did a restart and since then I got vertical stripes on my screen. I can still see the normal Huawei logo when powering on, but afterwards I immediately get white stripes…

I did not find any clue in the internet about what could have caused this. Can you help me please?

In the video you can see the stripes.

Thank you very much!!!