iPhone5 black\blue screen no logo

iphone5 black\blue screen after screen replacement...no apple logo,but i hear sound vibrate...i tried itunes update restore ,is the same. hold home and power off no result.any idea

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ok. i made it.seems that a little pin on the connecter was a little damage or have some dirt...i dont know why or how but now it s work

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Put it into dfu and restore to a backup. I've had this issue before, after changing a screen. Hopefully that'll do the trick. But you should see a logo. It is very possible that you misplaced your screws, and one of them is in the wrong place, damaging the logic board. If this is the case, it's not the end of the world, you could mail the device to Jessa Jones, at iPad rehab. Pretty sure she can fix that

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i dont have an back up ...i made an restore ..and nothing ...i unpug the batery , nothing..the screen is new, what do you mean by misplace the screws? i live in italy ...no waranity ... so ... other thing, i tried to call , the phone rings, its charging when i plug it to the computer ..how i can see if the problem is the logic board? ..thx...

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i also nootice that the foam on the one of the cables * new replacement screen don`t exist..could be that the porblem??

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No. The foam isn't the issue. I think you put a longer(bigger) screw, where a shorter(smaller) screw is supposed to go. And, hurt(owie) the logic(computer machina) board

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I agree with iMedic, foam shouldn't matter. I would suggest taking the screen off, and reconnecting the 3 cables to the logic board. Make sure you feel them snap or click into place on the logic board. Then gently put the metal plate and screws into place, making sure you do not tilt the screen more than 90 degrees, so that the cables to not pop off the logic board connectors.

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Ramona Oana será eternamente grato(a).
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