LCD03 robot-electronic don't work

Using Arduino LEDs and Multiplexing
3

I don't have a code yet.....
i try to use the simple example hello world attached to the wenz LCDi2cR or LCDi2cW library suggested for my kind of LCD.
It don't work (exept for randow blink led or wrong character) so i don't have a code yet.
thx