The only solution that has worked universally is to replace the main logic board.

These pictures show the problem chip that is the root of this:

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Thank you to:
Charles Judd
Brisbane, Australia

Who writes:* "Turns out it's a single package printer control system on a chip. Used by multiple manufacturers and hobby 3D printer designers. The printer controller, RAM controller AND LCD DISPLAY controller is all built into the chip. There is plenty of marketing material for this System On A Chip, but I was not able to find a schematic. I want narrow down where the power supply and screen controller lines are.

...

The System On a Chip is stuffed. Maybe dry solder joints, or the power smoothing caps underneath."

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*spelling and text error corrections are mine.