Quoted from pocketscience:That’s what I figured. Thanks. Still not working though. I confirmed that 5V was getting to the display but still nothing displayed. Known good display. Very odd.
If you haven't done it already, check polarity on the wires. Positive on mine was on the black wire. I complained a little bit to the people that sold me the wiring harness, but the instructions that I received specifically stated that the color of the wires was not necessarily black on negative and red on positive. For mine, black was positive and red was negative.