Aporte original por: The iPhone Guy ,
Can you see the Apple logo when you are turning the device on while holding a flashlight to it? If so, the it would be your sceeen or the backlight fuse. I would double check to make sure all the connection are tight and not loose or misaligned. If that's all good, I would try a new screen then. This would be a cheaper fix. If the new screen doesn't work, then I would start to look at the motherboard.