after my previous problem with the voltage levels on the SMR4 board (broken LM7905 ) I’ve run into some problems during the final stage of assembly. I have everything finished and just have to connect the to boards together, but there is a problem: When I do this, the LCD gives only half of it characters fully lit, and sometimes less characters or only backlight. Also, none of the LED’s are working, except for the left one of the orange two, and that one only works sometimes (when I plug it in or out that is). The remarkable thing is that this started happening when I added the LCD screen, before that the LED were working fine and even responded to the encoders and buttons.
Any ideas? Thanks in advance,