16x2 LCD Mystery [update]

i desoldered all pins except pin 15 (a) and pin 16 (k). acording to the tutorial the backlight should power when connecting pin 15 to 5v through a resistor (220 ohms in my case since i cant find the datasheet) and when pin 16 is connected to ground.

results: just like i said before - > no backlight..

here are some pictures in case you was going to say im not wiring my pins correctly..

thanks for all the efford already,
nick