Display issues.

[Ratman]

Hi there guys! My rambo board suffered from a shortcut and some of its components melted down. i replaced it with a new one, i have uploaded repetier firmware but somehow, my screen doesn't work, I mean, it light's up but it's blank. Everithing is well connected.I have already tried the contrast dimer in the back of the screen and checked the code in arduino, but cant seem to find any problem. Im able to connect to matter control and send commands but i need the display to calibrate Z.
Helpme please!
Thx a lot
Ratman.