iPhone 4S Logic Board Replacement

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Remove the following screws securing the logic board to the case:
One 2.5 mm Phillips screw near the vibrator motor
One 2.4 mm Phillips screw
One 3.6 mm standoff along the side of the logic board nearest the battery opening.
Use a standoff driver bit and driver handle to remove the single 3.6 mm standoff screw.
In a pinch, a small flathead screwdriver will do the job—but use extra caution to ensure it doesn't slip and damage surrounding components.

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