Introduction
If your Motorola Moto 360 3rd Gen smartwatch power button is not responding, you can use this guide to replace it. Before using this guide, inspect the power button, make sure that there is no dust build up. Dust build up can cause the power button to jam. Make sure to power off your smartwatch completely and disconnect from any external power source before attempting this repair.
Tools
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Use a T4 Torx screwdriver to remove the four 4.2 mm screws securing the lower case.
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Gently pry the case open with a halberd spudger if the case will not release after removing the bolts.
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Raise the cover without straining the connected ribbon cable.
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Disconnect the ribbon cable from the motherboard with a halberd spudger.
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While pushing the power button inwards, use tweezers to remove the c-clamp.
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Remove the power button.
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To reassemble your device, follow these instructions in reverse order.