I don't see a data sheet for that LCD, but it does say that it has a back light. On my LCD with backlight (from adafruit, here) you need to connect pin 15 to +5V and 16 to GND for the back light.
I don't see a data sheet for that LCD, but it does say that it has a back light. On my LCD with backlight (from adafruit, here) you need to connect pin 15 to +5V and 16 to GND for the back light.