Apple watch series 3

Apple watch series 3

Lots of Apple Watch series 3, 3 of them are 42mm and 2 38mm some still turns on and
makes a sound but no light on the screen this happened when I tried to fix them I even bought a brand new screen protector, screen glass replacement and tools, and a battery cos I thought I could fix them but it wasn’t that easy for me to do it and I’m not a technician or whatever you call it, and yes I ended buying a brand new Apple Watch series 7. Some screen on these watches still works on the other watch when I tried to put it there and turned it on, I believe someone could fix these better than me so if you’re a techie guy you got this. I will include all the stuff I bought in Amazon tools, screen, battery etc.