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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Replaced screen; screen turns off after a few seconds

My wife dropped her iPhone 4 (AT&T) and cracked the screen. I replaced the screen by following the directions here on iFixit. (The screen was from an eBay selling with a ton of good ratings.) The phone turns on, can be seen by iTunes, can be backed up, and photos can be down loaded--but the screen randomly turns off after a few seconds. The phone is basically unusable.

Here's what I've done so far:

1. After first replacing the screen the phone wouldn't turn on. It would vibrate though.

2. I disassembled the phone again, and found that the digitizer was not plugged in properly. I fixed it and reassembled it. (I did notice a small almost square piece of black rubber/plastic was left in the tray after reassembly. I'm not sure where it's from but it's not the rectangle bumper that protects the digitizer and LCD cables.

3. The phone turned on, but the screen doesn't stay on. After a few seconds it turns off. It's not consistent though. Sometimes the home button doesn't turn the screen on; sometimes it does and the screen turns on and stays on for quite awhile. The behavior doesn't seem to change whether it's plugged into the wall, a computer, or not at all. Again iTunes does see the phone when the screen is black. Also my wife claims that she can sometimes see the home screen icons, but very dim.

4. I tried to do a hard reboot thinking the issue might be battery related. But I'm not sure if it worked right. The screen goes black when the Apple logo appears. Then it was hard to get the home button to turn the screen on again.

5. I tried to do a back up and restore just in case it was a software issue. No change.

So that's where I'm at. Any ideas? Could the digitizer still be improperly plugged in? Could that little piece of plastic be important? Did I mess up the motherboard on accident? Could it be a battery or proximity sensor issue?

Help!

UPDATE: Something did change after the back up and restore. It almost works... When I set the phone or tap it with a little force, it turns off. Maybe somethings loose?

UPDATE 2: First off, what I've been calling the digitizer connector is actually the LCD connector. I had the two confused. The LCD connector is what I'm having trouble with. It just doesn't click in very well. Could that be my source of my problems?

Answered! View the answer I have this problem too

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Gabriel Lieb, you mentioned in your update that "The LCD connector is what I'm having trouble with. It just doesn't click in very well. Could that be my source of my problems?" yes, it most certainly could be. Use a magnifying source and take a look at the pins on the connector and the socket. Make sure that none of them is bend or broken and that they line up properly. Make sure you have the right screen and that the power is off. Hope this helps, good luck.

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I would try the old screen again see if it has the issue.. I have had screens in the past with this problem and turns off after 2 seconds but I have a test cable and test all my screen on arrival

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Try this take off you emi shield so it uncovers the lcd cable .

Now your new lcd cable won't have and foam padding this is to hold it down when the shield is on just cut 3 strips out of electrical tape and put them on top on the connecter. Then when the shield is on the cable of the lcd is being forced down

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Try with the back case off, does it still turn off? If not, use a piece of paper that you put at different spots between the phone and the back case to see there this is coming from.

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Gabriel Lieb will be eternally grateful.
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