odd home button speaker interaction
i have an iphone 7+ (call it phone A) that works great, but the back housing is badly scratched and scuffed and the camera glass is broken that i want to rehab for sale. seems like a simple operation, just pull the rear cam, mobo and battery and put it into a good back housing.
so i have another iphone 7+, no display, no mobo but the back housing is in perfect shape. let's call this phone B. so i put the mobo, rear cam, battery and taptic (just for good measure) from A into the back housing of B. i connect the display and to go power it up and test it. everything seems good except whenever i tap the home button i hear a squelch/squeak, then either a blip or a short burst of static, kind of like a walkie-talkie from the 70's every time you push the talk button.
i'm first thinking of swapping the larger speaker assembly, but if that doesn't work then my only remaining conclusion is installing a new charging flex assembly. although they're not expensive, they're a bit of a PITA to install (getting the motherboard connector to line up just right is the worst part). but if it comes that i'll do it.
one more thing.... the home button and touch ID work fine, but there is no taptic feedback when i push the home button.
so have i missed anything in my diagnosis or analysis?
anything i should look at or be concerned about?
Thanks in advance.
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