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.

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Cellular Antenna Cable socket

So, I've gotten into my phone several times to replace the touch screen. Because of this repeat access, I've cracked the antenna socket and am afraid it will tear off next time I pull the cable.

If I buy a replacement motherboard, will I lose everything currently on the phone?

Will I need to restart using the same process of a new phone?

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The mother board or logic board of your iPhone contains all your data.

You can replace the logic board or have someone with some micro soldering skills re-solder or replace the antenna socket. It is a pretty straightforward repair.

You can also just purchase a refurbished/used iPhone 4 or 4S. They should be pretty cheap by now, and cost almost as much as the logic board itself.

If you insist on replacing the logic board, all you have to do is connect your iPhone to iTunes on your computer and click on "back up now" then choose "back up apps" when/if prompted and also "authorize this computer" when/if prompted. Once done, repeat the process one more time. Alternatively back up everything on iCloud directly from your iPhone via Wi-Fi or Cellular.

Once you install your new logic board, connect your iPhone back to the computer and click on "restore back-up" (not restore iPhone). Alternatively, enter your iCloud account info directly on your iPhone and restore from iCloud directly back to your iPhone.

A note of caution: used phone or logic boards may be defective, have hidden defects such as water damage or other intermittent faults that appear some time after you start using it.

Also be careful to purchase an unlocked board or phone, by using the new boards' imei number on icloud.com to check the activation lock status.

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Think I Can, yes you will lose your files. All of those files are stored on memory IC that are connected to your logic board. You do want to back everything up. then, when your replace the board, you can restore your files. I would suggest that you try to find someone who can micro solder a new antenna connector to the board. It'll safe you a lot of hassle dealing with a logic board that you do not know the history off.

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Think I Can will be eternally grateful.
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