I think I've blown my epaper display. I had it working briefly with the DESPI-CO2 interface but after moving it around (carefully I thought) the last info I printed to the screen is there but I can't update it.
On the interface card PREVGH is sitting at about 3.2volts and PREVGL at 0v. There is no signal on the GDR pin, which assume is some sort of switching out put to drive the voltage multiplier to drive the PREVGH and PREVGL levels.
Do I give up on the display and just buy another or am I missing something elese?
Sounds like a damaged display.