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This is the first time I've come across this problem after repairing many iPhone 7s.
When the phone is locked you click on the home button and get taptic feedback. The touch ID works and you get access to the phone.
When the phone is unlocked the home button stops working. No taptic feedback at all.
The fact that it works when its unlocked means its not broken.
Has anyone else come across this problem.
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I wonder if the taptic feedback you are getting when you unlock the phone is more related to successfully registering TouchID than to recognizing the "click" action. For example, if you could delete the stored fingerprints, the button may not recognize your finger push at all when locked. Clearly the button doesn't register your clicks afterwards.
This scenario happens when the IC (Turtle / U10) on the Home Button flex gets damaged. This is a common occurence (relatively speaking) when the button flex is transferred over to a new screen. The solder balls underneath the IC can crack and cause connection issues. This can be repaired via a micro-soldering repair.
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The plot thickens. I asked the user to update me throughout the weekend. After charging the phone for 30 minutes the home button started working again and then several hours later he reported that it stopped working again.
This still points to a potential U10 issue on the HB flex.
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