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I've replaced the ribbon cables to the iPhone home button, and the home button was still not recognized. I went ahead and tested the home button that I repaired in another phone and it worked fine. It is evident that it is the logic board that doesn't recognize the home button functions. It appears as though this phone encountered some water. Any help to get this resolved would be excellent!
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The home button doesn't make contact with the motherboard as such...take a look at the top of the dock connector-there are 2 small blobs of solder a little to the left of centre that the prongs make contact with. Try cleaning them.(and the rest of the inside if it is looking water damaged)
You also need to clean connector 4 as this connects home button to motherboard.
If that doesn't work you may need a new dock connector.
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I've seen this home button failure problem numerous times with the 3Gs and water damage. I came across a fix a while back that allowed me to fix 2 water damaged logic boards that had lost home button function at board level (replacement of home button flex cable did not resolve) that I had figured I'd tried everything on.
I'm posting a link to an image that shows the area on the backside of the logic board that need close inspection and further cleaning with a needle to resolve.
Good Luck!
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I switched out the dock connector as I noticed the two blobs where it made contact. It still had the same issue which lead me to believe that it was the logic board itself. I also switched logic boards and kept all the same connectors in place and the home button began working with the different logic board. Do you have any other suggestions or potential solutions? I appreciate your help.
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have you checked the prongs under the home button? just lift them up a bit more- they may not be making contact with dock.
never heard of a home button not working on the logic board. All I can suggest is a deep clean with isopropyl alcohol to remove any dust and dirt left from the water that you can't see. this will involve taking metal protector off mother board-lever off by turning flathead screw driver 1/4 turn under each of the tabs (about 50 so patience!)
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@GURUmicro THANK YOU!!
I repair iphones etc for a living and have never come across this fault before,
as others have mentioned the problem is usually with the contacts or prongs on the screen,
however this had me stumped as i had tested the contacts (even tried a new screen) all so tried a new dock and still the same fault.
I thought i would have a quick search and found this post, as you said the small contact looked fine to the naked eye, under a microscope there was a small amount of residue which I cleaned....
Hey presto this cured my problem!!
The phone had been in water although there was no evidence of this anywhere.
Thanks again :-)
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