I wanted to update the forum on my findings when repairing a second home button problem.
I had taken my most current IPhone repair job apart to replace the broken glass screen and update the battery. In replacing the screen I had lifted the ribbon cable that attached the bottom portion of the phone with the main radio board. After replacing the screen and battery I tested the phone to make sure everything was good before putting back together. I found that most everything was good but the home button now did not work. The button worked fine before the fix.
I was lucky to have a trashed IPhone that I could take apart and poke around at. I found that the ribbon cable that I lifted to replace the screen has a large copper pad on the bottom and the adhesive that Apple uses when putting it together helps to keep it from touching the the metal plate area were the battery sits.
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When the ribbon cable is lifted the adhesive is broke and the battery ribbon cable will ground out on the battery plate area. This will cause the home button not to work.
I all found that Apple has used a double layered plug on this ribbon cable and most people dont know to push it back in all the. This will require some preasure but dont rip the cable.
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