Display only working for a fraction of a second

Hi,

I just replaced the display for my Huawei mate 20 lite, however, upon reboot the screen appears to not work properly. When I turn the phone on, the android logo and text display correctly, and whenever I turn the display on it also works for a fraction of a second. Then the display only shows vertical lines. I have attached a couple of videos to show the problem. Does anyone know if I installed the display wrong or the software prevents swapping displays or maybe the several drops damaged something?

Thanks!