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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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Screen stays black & unresponsive

Hi Guys.

Hopefully someone can help.

I have asked to look at an iPhone 4 where the screen is blank & unresponsive.

I have tried 3 new screens all with the same result i can see the backlight is coming on as i have tried it with just the motherboard, screen, battery & dock connector out of the phone but getting nothing on screen.

I have also tried assembling the phone & holding the power/home button down for a soft reset still nothing.

I know the phone is on as when I plug it into iTunes it asks me to allow access into the phone which i cannot do as the screen is unresponsive.

I cannot run data recovery as i can't allow the phone to trust my Mac.

Anyone have any ideas or any help would be greatly appreciated.

Thanks

Answer this question I have this problem too

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Hi there I the phone running old iOS 5 or 6 cause the new screens won't recognise the old firmware!

If it's on ios7 then I would look at the pins on the logicboard for damage around the lcd make sure there not bent or broken off.

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Thanks again con ;)

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Hi Con.

The logic board on this phone is getting very hot when the backlight is active.

The screen is still activating i can swipe to open & input the passcode but the screen is staying black. This could be the logic board has burned something out ?

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Very funny this is happening to all 3 screens but phone under a light can you see the screen very faint if so the backlight has blown

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try doing a soft reset power+home hold at the same time for about 30 sec that should fix it as long as the board isnt water damaged. A also try looking to see if the conectors on the board are all good and not broke.

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I'm trying to do the soft reset but it keeps taking screenshots but the power button seems ok as it activates the phone etc it just won't stay on when held

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looking at the pins under a magnifying glass they are all intact & not bent they look fine.

No signs of any liquid damage.

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