Replacing the motherboard is covered in this guide.
Use your fingernails or a spudger to pry apart the cover at the top edge of the device.
Identify the indentation at the lower left side of the battery housing.
Remove the top and bottom 3mm screws using a Philips #00 screwdriver.
Breaking the reflective foil can void your warranty.
Locate the two ribbon cable connections on the motherboard.
Use a plastic opening tool or your fingers to carefully lift the motherboard assembly.
Locate the Phillips head screws (#00) on the motherboard's front face.
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