Introduction
Prereq-only guide for transferring components from an old display assembly to a new one.
Tools
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            Apply heat for 2-3 minutes to the bezel area below the display on your old display assembly, in order to soften the adhesive securing the fingerprint sensor. 
 
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            Using your finger, press firmly on the outward-facing side of the fingerprint sensor until it separates from the display assembly. 
 
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            Slide an opening pick underneath the fingerprint sensor's flex cable, and carefully cut through the adhesive securing it in place. 
 
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            Apply heat for 2-3 minutes to the top bezel area above the display on your old display assembly, in order to soften the adhesive securing the front camera flash. 
 
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            Use the point of a spudger to push the outward-facing side of the camera flash until it separates from the display assembly. 
 
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            Slide an opening pick underneath the flash flex cable, and carefully cut through the adhesive securing it in place. 
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            Remove the front camera flash and set it aside. 
 
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            Carefully peel away and remove any remaining old adhesive from the fingerprint sensor. 
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            For best results, clean the adhered areas with isopropyl alcohol to help prep the surface for the new adhesive. 
 
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            Remove any remaining adhesive from the flash assembly as well. If desired, clean it thoroughly with isopropyl alcohol. 
 
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            Cut two pieces of L-shaped double-sided adhesive tape, and stick them firmly to the perimeter of the fingerprint sensor as shown. 
 
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            Use the flash assembly and a fine-point pen or marker to trace out an appropriately-sized piece of double-sided adhesive tape. 
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            Cut the tape to about the right size and shape and apply it to the front-facing side of the flash assembly. 
 
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            Peel off and remove the liner from the adhesive tape on the fingerprint sensor. 
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            Place your new display face-down, and carefully lower the fingerprint sensor into position on the back. 
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            Press firmly on the back of the fingerprint sensor for several seconds to allow the adhesive to bond and secure it in place. 
 
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            Peel away the liner from the adhesive tape on the flash assembly, and press the flash into place on the back of the new display. 
 
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To reassemble your device, follow these instructions in reverse order.