I've tried to find a similar problem within the forum but couldn't. This was brought to me by my daughter's friend who complained of a "half-working" screen - lines down the length of it - screen or connection I thought. When I get my hands on the phone there is nothing on the screen. I can't get anything to come up on the screen nor any haptic feedback but when i connect it to the computer it requests the passcode (which I have but cannot enter). So I assume the screen has further "decayed" and replace screen and digitiser but it's still the same. Dead main board? Any help would be gratefully received.