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I replaced a broken 4S screen with a new working one and the phone turns on but the screen doesn't work. After 4 hours of swapping around and trying screens, I put another not so cracked one on and that worked. I tried several times with different screens and only the broken ones would work. Can anyone tell me what it could be???? (I tested the screens and they worked but not on that phone) So frustrating!!!! Any ideas would be appreciated please

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