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Step 17
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Use a small flathead screwdriver to remove the 4.8 mm standoff near the headphone jack.
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When reassembling the device, this standoff sets the height of the Wi-Fi shield removed in step 13. If not torqued down, the shield will be above the plane of the frame and the back will not slide into place in step 2. The shield should be flush with the headphone jack.
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When reassembling the motherboard, ensure that its edge sits under the circled standoff, otherwise the screws will not fit.
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When reassembling ensure that the small rubber spacer attached to the top of the motherboard is in place. Without this part the motherboard could damage the ribbon cables around it.
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Step 20
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Remove the speaker enclosure from the iPhone.
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Before re-fastening the speaker enclosure to the inner frame, be sure the four small EMI fingers rest below the lip of the LCD frame.
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Before reassembly, be sure to clean all metal-to-metal contact points between the EMI fingers and the internal frame as well as the brass screw mounting point with a de-greaser such as Windex. The oils on your fingers have the potential to cause wireless interference issues.
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Step 23
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Remove the three large-headed 1.5 mm Phillips screws along the volume button side of the iPhone.
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Keep track of the washers under each of the screws.
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Tip: It can be tricky, but it is also possible to just loosen the large-headed 1.5 mm Phillips screws slightly, without having to remove and replace the screw-and-washer set.
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