Ramps LCD Smart controller Temperature uncontrollable raise! (1 reply)

Hi,
I have set up my LCD Smart Controller.
It is connected, it reads temperature. It does the x,y,z homing.

But I have some problems:

1) when I set the PLA preheating it does not stop at 180 Celsius. It continues to raise, more than 250 °C!

2) If I change the PLA preating values nothing changes, it always display 180°C.

3) it detects that I inserted an SD Card but I can't see anything inside (I have copied in the root a .gcode file and created a folder).

Any suggestion?
thank you,
Gaetano