Chosen Solution
I know this question has been asked before but since this is an old question maybe a better answer has been found or even a video. So basically I change my iPod screen (this was not the first one I repaired) and not the LCD does not turn on even the old one. Is it possible that I unplugged the battery or something? Thank you for your help!
I fixed it. I just put ipod in dfu mode then plug it to my computer and the apple logo showed up. If anyone get this problem try this
