Remi, this is the new V4 board and I am pleased to report that the Nano is now socketed . Without removing anything soldered, with the display still not connected, I measure 1,590 ohms from the +5 output of the 7805 to ground reference (the 7805 tab). Both polarities, indicating that my ohmmeter has low enough applied voltage not to cause any junctions to conduct. Did you measure to see if the +5 volts was actually what was expected? -Don
Don, ND6T