Should be at least 108 modules from the two screens we took apart, cant recall how many had issues, but shouldn’t be more than 20, if it has tape on it its suspect.
I also have a full file box with more at home, working to sort and test em into okay or not piles.
As for the plan, I was originally planning to do some workshops, but with covid and all I haven’t had time.
At this point I don’t know what we want to do with them, should we kick it to the surplus committee or free for all it? I am pro blinkies though.
The two remaining assembled video walls upstairs are a work in progress though, I finally got some legs built, be installing them this week so we can make that functional, I think I only have to replace 5 or 6 modules on them, know more when I get it running.
Another good project for these is smartmatrix: GitHub - pixelmatix/SmartMatrix: SmartMatrix Library for Teensy 3, Teensy 4, and ESP32
they even sell breakout boards SmartMatrix SmartLED Shield (V4) for Teensy 3 : ID 1902 : $19.95 : Adafruit Industries, Unique & fun DIY electronics and kits
that let you plug direct into the HUB75 connector, though its pretty easy to cut up the ribbon cable and solder the data wires direct to the microcontroller. Offiically you need a level shifter, and you probably should have one, but I have a teensy 3.2 with no shifter running a screen in Calgary that’s been going 24/7 for 5 or 6 years now unless it died recently.
Oh, one other note, if you are going to run a couple panels or more off a cheap wallwart, solder a big honking cap to the 5v and ground on the back of the module, the inrush on these things is spicy when they go white and will brown out your microcontroller if its on the same power rail, once spent a week trying to debug sd card errors until I figured that one out.