a moment of silence for the original microcontroller.  It was missing on arrival, presumably because the original hackers didn't want anyone else wasting time (or getting hurt) trying to fix a sign that was far too broken.  Or maybe it also got wet and fried?  Or its sitting in a roof screwed to a headboard somewhere?

 The original *massive* 50A power supply was overkill, and came in an open-air frame.  A potentially dangerous situation since this already broke once from water damage...

Below is the power panel after :). These PSU (power supply unit)s are the the beefiest 5V enclosed ones that I could find (15A).

 I designed and 3D printed custom screw supports for them.  I also added voltmeter displays for each PSU (I had some red and some blue so that's why they're different colors), and then I installed my custom PCB with the microcontroller and level shifter IC (74HC245).  It's upgraded with fuse protection, reset button, and other minor tweaks.  I also installed my nice 3D printed strain reliefs.  I went ahead and cut some new plywood to size for the whole