I can initialize the display and print text no problem, but the text is very dim. I have a voltage divider stepping 5V down to 0.65V on my PCB...measuring this pin on my PCB before plugging the display in reads 0.6V. When I plug in the ribbon cable to the display, this pin raises to 1.2V. I changed the voltage divider to be 1V, upon plugging the display in, it raises to 2V. This is the only pin that changes voltage with the display unplugged from the PCB versus plugged in. Thus, I have no idea how to properly set to contrast voltage. I don't have the appropriate trimmer in stock.
I checked for shorts in the ribbon cable, everything is good. I measured each pin on the display with it plugged in and powered on:
Pin 1 = 0V
Pin 3 =1.2V (connecting the display changes this from 0.6 to 1.2V)
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