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Originally Posted by Quoth
Electrically, not magnetic.
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Electricity provides the magnetism that moves the beads.
But there can also be other causes.
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Maybe there is a bad connection on thr ribbon cable to panel or an IC on PCB.
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That would mean an immediate change - not the slow darkening.
This reminds me a lot of the sun bug in the Boox Nova 2 or in the Likebook Ares - 7.8 Wacom layer.