Replaced iPhone back housing , it doesn't turn on

Hi Guys ,

i changed the back housing of my iphone 5S and after everything is done i tried to switch it on , the apple boot logo appears and the phone turn off .

1. i tried to restore it and didnt work

2. i tried changing the battery and screen with another iphone 5s and didnt work

please guys , get me a possible fix ..

thanks in advance