Solar not working
Sounds and looks like you may have a problem on the battery side. There should be fuses on both sides of the controller and since you have nothing on the screen I think you have no connection to the battery. Could be a blown fuse or bad connection. Get a VOM as suggested and check for voltage on inputs (solar panels) and output (battery). Most solar charge controllers get power from the battery to work (screen display and control logic). If battery is not connected nothing works. Once you know which side is at fault trace voltage back along the path of the wires to where the break is and correct it. Hope that helps.
Retired and Traveling Often
2015 Winnebago ERA 170X 3.0 Diesel
2016 Smart car for TOAD South central Wisconsin.