did you check continuity on these lines between the controller & the LCD?
jap! I did for about a thousand of times! 
I now also had a look at the wireing I used to connect it to parallel port of the pc and followed all wires. It is the same connection as in this picture:
Except:
- R/W (is wired to pin 14 of the parallel port
- +5V of the backround light. It is pin 16 on my lcd board
- GND of the backround light. (pin 15 on my lcd board) This is wired over a transistor ciruit tu pin 17 of the parallel port.
I would try to hard code it without the library, but I'm unable to find timing schemes of the KS0066 or the SPLC780 module in the net.
greetings kuhni