Introduction
If your Kindle Fire HD 8 12th gen is having issues charging, but you know your battery is healthy, try using another cable. If no cable works then this may be caused by a faulty USB port. To replace the USB port, follow these steps below.
Tools
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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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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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Once the motherboard is fully disconnected from the device lift the motherboard out of the chassis with an opening tool.
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To reassemble your device, follow these instructions in reverse order.