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If your kindle fire HD 8 12th generation is experiencing audio issues or getting stuck on the amazon logo screen upon startup, it may be caused by a hardware issue which can be fixed by replacing the motherboard
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Insert an opening pick into the seam between the rear case and the screen assembly.
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Slide the opening pick around the perimeter, prying periodically, until the screen assembly begins to release.
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Insert an opening tool into the gap you created, and continue to pry periodically around the entire perimeter until the screen assembly fully releases.
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Use an opening tool to lift the battery connector until it disconnects.
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Gently and slowly grip and pull the three white adhesive tabs that secure the battery until they fully release.
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Gently pry around the entire perimeter of the battery with an opening tool until the adhesive releases.
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Remove the battery.
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Lift the black ZIF locking flap.
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Disconnect the ribbon cable.
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Remove all of the Phillips screws that secure the motherboard.
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Desolder all of the soldered motherboard connections.
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Lift the motherboard up and out of the chassis.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.