apple logo is not zed black during boot up in iphone5.Back light (lcd light ) also lit immideatly.vertical lines appears .after reduce contrast some part of problem solved. IF it's static current problem or hard ware problem.i reset many times and reseated lcd many times but no solution
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Usually it's a damaged LCD ribbon cable which in result requires a replacement screen to fix the problem.
I'm guessing you have visually inspected and cleaned the logic board screen connectors (The long vertical one and the short horizontal one on the board).
Have you tried another screen yet?
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Thanks dear but I replaced two different lcd same problem I think static current
by Manoj