When lifting the motherboard, note that there will be some resistance near the USB port due to an adhered foam gasket/funnel which channels sound from the tiny hole in the glass to the voice mic on the back side of the motherboard. Before re-installation of the motherboard, inspect the shape and hole in this foam gasket. It should look like cylindrical standoff about 0.1 inch tall. If it is not a clear sight to the tiny hole in the motherboard, sound will not reach the voice mic. I used the point of a spudger to re-form the hole.
There is a thin black foam gasket (like a small washer) that is stuck to the front of this camera lens housing. On mine, the gasket was stuck off-center with the inner edge in the field of view of the lens. Using tweezers, I removed it and re-attached it on center. The image is now much sharper!
This foam "funnel" required re-forming of the center hole (also check hole in back cover foam gasket). If this sound channel gets blocked, the noise canceling will not function properly. Before re-installing the lower antenna assembly, check the oblong 2-hole gasket on the back side of the antenna assembly which covers a sound channel to the offset microphone input hole. If deformed, gently reshape it with tweezers to assure both holes are not plugged.
I recommend using a flat wide tweezer blade to remove this part. The adhesive is in the form of a mesh rectangle with adhesive on the speaker side. I believe this also serves as a keep-out for debris. You can control how the speaker lifts up to avoid separating this mesh from the speaker element.
All screws appear to be Torx T4.
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