Why that the screen doesnt work anymore

@superman31103 you are not giving us a lot of information. It would be nice to at least know what your screen shows or what the issues are. Of course, if it is a broken screen, you will need to start by replacing it. Since iFixit does not yet have a specific guide for this, use something like this video. Replacement screens are readily avaailable at many online sites.

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!