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Fourth generation iPhone. Repair is straightforward, but the front glass and LCD must be replaced as a unit. GSM / 8, 16, or 32 GB capacity / Model A1332 / Black and White. This page aims to help users troubleshoot, fix, and seek help for the iPhone 4.

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coloured line after replacement

i've changed my iphone screen when it cracked then a coloured line showed up on my iphone screen

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I would double check that the display cable that connects to the mainboard is firmly connected and has no creases or tears in it. If all seems ok this sounds like you have a faulty screen and you should ask the supplier for a replacement.

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Replace the LCD.

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aljazi will be eternally grateful.
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