Geeetech

I have a geeetech prusa i3 blck with arduino mega and ramps. My LCD controller is unresponsive. It shows normal text, it reacts to temp on both extruder and bed, it gives correct ete. It just does not respond to the dial or push button.

Ive checked the firmare and this is how it is defined:
// The RepRapDiscount Smart Controller (white PCB)
// http://reprap.org/wiki/RepRapDiscount_Smart_Controller
#define REPRAP_DISCOUNT_SMART_CONTROLLER

this also coincides with my white pcb

ive also reversed the wires in some other posts but the screen does not display anything at that point.

Suggestions?

Let's get something clear first:
There 2 cables that connect the LCD and mainboard. One of cables controls reading SD card and rolling, another controls displaying and reacting pushing knob.
So let's check if the cable ,which controls displaying and reacting pushing knob, is bad.
Swap the connection of 2 cables, both on LCD and mainboard. If LCD displays normally and you can push the knob, but it can not reading SD card or you can not roll downward via knob, we can conclude that the cables which controls displaying and reacting pushing knob is bad.

ok, i'll keep you posted