K8101 - Problem with the backlight


first of all sorry for my bad English but I’ve tried my very best ;).

I have bought a K8101 USB Message Board. Soldered it an everything works
fine, except the backlight isn’t working. I don’t know what i do wrong.
Even with the test program it isn’t working. Do i use a wrong resistor?

In the kit there was a 10k metalfilm resistor for Position 5 on the
board instead of the 1K resistor mentioned in the manual. I have
soldered a 1k resistor instead of the wrong resistor supplied with the kit.

Is there a possibility to test the display without using a PC to exclude
a hardware defect?