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Оригинальный сообщение: Master ,


After replaced the LCD for GSM iphone 4 with iOS 5.x, the screen couldn't turn on.  I tested the LCD on another known good iphone 4 with iOS 7.1 and the LCD is working perfectly fine.  At this point, I am sure the LCD is good.  Therefore I updated the iphone 4 with iOS 5.x to 7.1 and reassemble the LCD to the phone.  Then, it solved my screen problem.