I just finished replacing an iphone 5c screen, and checked to see if it would power on before I put the screen back fully into place. The apple logo came up and the phone powered on normally, so I shut it off and put the screen fully into place. However, the backlight seems to come on but the screen remains black with no apple logo. It still responds to charge still and vibrates but the lcd remains black. The connectors look normal and do not appear damaged in any way. I have tried hard resets and taken the phone apart several times with no avail. I have also tried other screens which produce the same result but work in other phones. I fear this may be a short in the logic board, and if it is such, is there any fix besides completely replacing the logic board?