Introduction
Prerequisite-only guide to remove the lower support bracket in an iMac 27" 2017.
What you need
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Use a Phillips screwdriver to remove the nine 3.2 mm screws securing the support bracket.
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You may need to peel up the display adhesive lining the bottom edge of the iMac enclosure to access the screws.
Ask FixBot
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Remove the lower support bracket (a.k.a. "chin strap") from the iMac enclosure.
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Position the bracket diagonally.
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Secure the rightmost screw enough to hold the bracket in place; keep it loose for now so the bracket can pivot.
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Swing the left side of the bracket down until it sits horizontally in its original position.
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Starting with the leftmost screw, install and tighten the remaining screws.
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Conclusion
To reassemble your device, follow these instructions in reverse order.
