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Old 12-22-2023, 05:11 AM   #2
Quoth
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Misalignment of the bezel. It's an IR light pipe putting beams across the screen. The PCB has IR LEDs and photo-transistors. The black is transparent to infrared and the bumps are some kind of lenses.

Also the touch thus won't work at all if the unit isn't assembled in the case! Later models use capacitive touch which makes the screen slightly dimmer but otherwise has less problems.
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