DFR0009: Backlight but no text


I've connected a DFR0009 to my Arduino Uno and uploaded this popular sketch (first example). However, the backlight stays on all the time and I see no letters or anything else on the display.
I've already tried turning the potentiometer in both directions, but this didn't help. I know that this must be something very simple, but I'm stuck here.
Any ideas?

Best regards

Got it! Didn't know that I had to turn the potentiometer THAT long. :wink: