I've got me myself a little problem with my RAMPS 1.4 runinng Marlin-1.0.2-1 and 2004 LCD Intelligent Smart Controller (RepRapDiscount Smartcontroller, this one ebay) can get it to display temp etc. but do i use the button, the display gets weird
Could be cold solder or bad crimp contacts. I had some hiccups in my display from turning the encoder to fast, but after pushing the knob, it refreshed.
-Olaf
Is the problem consistently happening every time you press the button?
To use a technical term, have you tried wiggling the cables a bit to see if you
do have dodgy joint on one of the boards?