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 Proximity sensor cable no power

My iphone power button had worn out and had become very stiff to press so I took it apart, and identified the power button was missing the black nub. So I ordered a new power and proximity sensor cable.

I followed the guide on Ifixit to replace the cable and put the phone back together carefully making sure all the cables were in correctly. I tried turning on the phone and there was no power at all, even with the charger in.

I tried charging the phone for a few hours and still got nothing. I then took the phone apart again and looked at the cables at the top, as soon as I unplugged the new proximity sensor cable the phone randomly powered up and worked fine apart from the sleep/wake button and proximity sensor. Every time I plug the proximity cable in I get nothing the phone will not turn on but as soon as I unplug it the phone powers up every time.

Does anyone have any ideas what is wrong?

Answered! View the answer I have this problem too

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Only thing I can think of is the power button bracket is tightened too much and constantly holding in the button causing problems. I guess a short of some sort in the ribbon cable could do it as well.

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Nick will be eternally grateful.
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