Arduino is writing to LCD, I can find no errors, but no LCD-text. What is wrong?

Using Arduino Displays
3

Looks like the LCD display is backlit - connect pin 15 to +5v and pin 16 to GND

(EDIT) also check the value of the pot - needs to be at least 10k.
I have found I could replace the pot w/ pin 3 connected to ground w/ a 9k resister