My iPhone boots to the Apple logo and then turns itself off.

My iPhone boots to the Apple logo and then turns itself off, but that only happens while charging in the wall, if i connect it to the laptop it just doesn't work at all, it's all black then, and obviously unplugged it is black too. Why's that? I can put the recovery mode, but because i'm not in the laptop, i can't do $@$*. The history is my iphone 6 fell off one day and it was working right after it, then i put it on the sofa, and suddenly the screen went black, and it didn't matter what i was doing, plug it in, hold the power and home buttons and the same time, it didn't work, all was black . Then it, but it fell again, and i thought that maybe because of that hit was fixed, so i tried charging it, and now it appears the apple logo, but it turns off after a few seconds, it's in an infinite loop. But it only does it while it's charging in the wall, if i connect it to the laptop, or without charging, it's all black then. Can someone please help me? I don't care about my old data, i just want it to work again.