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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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Why does my phone not turn on after the components were reseated?

TL;DR : My phone broke after a restore, won't turn on or connect to my computer, heard about iOS 5.1.1 affecting parts.

I did a restore to an earlier operating system (iOS 5.1.1) today on my iPhone 4 and it didn't show anything on the screen at first. I took off the back and reseated the battery and the display connector and it seemed to work. I then plugged it in and the screen went black and the phone went into DFU mode. I restarted the device and it didn't turn on after the restart was complete (after the apple logo displayed). I disassembled it again and now it doesn't seem to turn on or recognise it in iTunes or the Linux virtual machine I have on my Mac. It is either the cable or the internals inside the the iPhone itself. I have heard rumours that it is a problem with iOS 5.1.1 (having a counterfeit screen and nothing will work) and that the only way it will work is if I replace the screen and it will now work. Only it has had no new screens on it and I can't go into iTunes and restore it as it now won't work with iTunes even though I synced it with iTunes prior to the incident. I have tried hard reset and I have tried switching the volume switch on the side. The question is: How do I get it to boot up?

How do I start up the phone and get it working?

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UPDATE:: Tried to take it all apart and reassemble the entire phone and still nothing even though when I had the top shield being put back in the LED flash had stayed on until had put the shield fully on and disconnected the battery. I really need to get this phone working again to recover all of the pictures on the device.

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If the phones already gone into dfu mode, likely you've lost whatever you haven't backed up. I would assemble the phone, or at least the display logic board and lightning dock, then try to connect it to iTunes. Then, if this doesn't take, I would fully assemble the phone, then put it into dfu mode

iPhone 4 Teardown

You may want to use this guide, to check your connections. I'm starting to wonder if it's one of the connectors, near the LCD/digitizer, that's either not connected properly, or has been damaged

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Thanks for the advice. I think the LCD connector may have been damaged after the time I dropped it on concrete while trying to plug in my headphones. My father took a look at it when the LED flash lit up while putting the back shield on and said I may have accidentally short circuited the device because I forgot to disconnect the battery.

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Ehh.. I would think that the display could have been short circuited, while doing the repair. Or damaged during this whole process... However, that wouldn't affect you being able to connect the phone to iTunes... You could try a new display, which isn't very expensive. However I'm fairly certain data recovery isn't going to be an option

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