iPhone X Front N Back camera dosnt work?

I just changed the Battery on my Iphone X 256gb. The sudenly the Front N the back camera stop to work. Its pitch black. Then i take it apart again. Then the cameras started to working again. Then i set the display on then it stop working again. Pitch black. have tested many things. But still dont wokr. i use a Iphone XS display on my iphone X. I have tryed iphone X display to but dosnt work either. So it can be hardware problem? What to do? Some body know some good program that can search for problem oim the phone maby or other idees?