Maybe there is a bad connection on thr ribbon cable to panel or an IC on PCB.
Quote:
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EInk only changes if something affects the magnetically sensitive beads in the module
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Electrically, not magnetic. But yes, if the panel is disconnected it shows the last image for years, maybe longer.
So the issue is the electronics or a bad connection, not the panel. If the panel has a crack (physical damage) then there are lines and/or part of the screen never changes.