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The light guide plate is held down by a small strip of mild adhesive—nothing like we saw before.
Erring on the side of caution, we proceded very slowly with our modified iSesamo opening tool and removed the plate.
Backlight bounces through the plate due to total internal reflection until it hits one of those tiny dots, which sends the light up and out of the front of the plate.
By the way, the third picture is an image of the grid found in the clear plastic plate being removed in the second picture. We had to coerce it a bit in Photoshop in order to make it show its grid.
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