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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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Touchscreen works, but no display.

I'm currently trying to fix an iPhone 4 that had a cracked screen. At first I tried to replace the iPhone 4 screen with a spare iPhone 4S screen, which actually showed the logo upon boot, but would flicker during boot and just quickly flash when trying to unlock (ie. pressing unlock would turn the screen on, but only for less than a second, giving me a chance to see the lock screen wallpaper).

Then I bought a new screen made specifically for the iPhone 4, but it was much worse, the logo does not even show up during boot, and when I press the unlock, it lights up for less than a millisecond.

I've searched around, and saw someone mentioning that the screen I have bought required me to update my phone. Unfortunately, my wife put a passcode on it which she forgot (we cant even see the screen in the first place) and the original laptop I synced the iphone to is long gone.

I can confirm the touchscreen and some of its components work since (for BOTH screens):

*I can attempt to find the "slide to unlock" and I can hear the keypad click.

*I can take screenshots using the home and lock button

*I can also switch back and forth the vibrate button.

Answer this question I have this problem too

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Put phone in dfu mode and you can update the firmware

Plug phone into laptop and it will say locked by passcode now hold power and home together for 6 seconds then let go of power but keep holding home button you will here a few beeps from the laptop and you phone should be in recovery mode and let you restore and update

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Lol think you may learn to read james

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First, Try DFU mode. How to enter DFU mode:

Plug your device into your computer

Turn off the device by holding the Sleep/Wake or Power button and swiping it off

Hold the power button for 3 seconds

Begin holding the Home button without releasing the Sleep/Power button for 10 seconds

Release the power button and continue holding the home button until you get a popup from

iTunes that your device is recognized as being in recovery mode.

If that does not work, it sounds like you might not have connected the video connector fully, only the digitizer connector. Open it back up, and hold down the shield on top of the connectors firmly as you put the screw back in, to hold the shield in place.

If this helped or you found this answer useful, please 'accept' or click the up arrow :)

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^

Did I just not say that james lol

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You suggest that he go into DFU mode, but did not explain how to do it.

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