If the backlight doesn't come on when power is applied, you may wan't to check your wiring to make sure everything is correct. One thing to note is that the backlight needs to be connected to between 3.0V and 3.3V
The wiring is o.k... at least the power
I can measure 5V between the VCC and GND with a multimeter on the pins of the PCB.
But actually I connected it to arduino 5V as the JP1 is open and according to the description in this case 5V must be supplied to the board.
I guess there is no separate pin for backlight and we are talking about the VCC...
Anyway, thanks guys for the sample codes I wouldn't try them out as long as this backlight issue is not solved...