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The touch id button is connected over the 3d touch cable to the logicboard. This cable is very thin and fragile. You need to check this cable. It´s behind the metal backplate. You check out this iPhone 7 home button not working after screen replacement
Check my comment and you will see what I mean. To repair this you need to replace the 3D Touch.
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Check the contact when flipping the screen back down, those two contact circles need to make a proper connection once the screen is put back on, there are two leaf clips that can be damaged opening the phone.
Hope this was helpful .
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