Hello-
I am working with LCD-00813 http://www.sparkfun.com/commerce/produc … cts_id=813
It is all dark and I cannot even get the Sparkfun logo to come up anymore.
I thought I had turned the contrast potentiometer in the wrong direction too many times- maybe. Or else the LCD is broken.
So which direction is bright and which direction is dark?
What is the resistance of the contrast pot? I measure 12Mohm with power off from VCC to GND and 2.5Mohm with power on.
From GND to wiper, I measure 1.9Mohm with power on, about 8k from VCC to wiper.
What resistances should I be trying to get when something is visible on the screen? Is the pot referenced to VCC or GND?
Mohms seem high.
Thanks!
Nora