I'm having trouble getting the LCD to operate properly on my big delta. It powers up but the screen is blank. I can jog the steppers from the PC so I know Rambo is working. The LCD main knob beeps when I push it. The SD card is recognized, but when it's in the knob doesn't beep when it's pushed. When I upload the firmware, the Rambo won't restart like it did on the Rostock max. Something is amiss. Pin assignments? I have no idea. I need some assistance.
Have you confirmed that the ribbon cables are properly aligned and in the right positions? The pictures in the manual aren't super clear and it's common for them to be swapped which produces what you are describing.
If you are certain they are properly installed, you will need to contact SeeMe for a replacement as we do not carry the LCD screens. Let us know if you need any other help.
support@matterhackers.com will get you the fastest response.