Websteria This is a big problem. I think quality control on these chips is bad. I got maybe 2 out of 10 that didn’t have a problem.

Websteria This is essential for troubleshooting. I can’t believe a kit company wouldn’t release a schematic for a kit?!! How are we supposed to learn from this circuit?

Websteria You may have a bad mcu or the blue shorted to something else on the led side. All the anodes are tied together so a short at one would appear on all. Also just confirm all your mcu pins are soldered well.

Websteria Did you ever get this fixed? My first digit won’t turn on either. Everything else works. It seems to mirror some other digits but only on like 6-7. So weird. Checked every component. About to give up and hot air remove the mcu and respolder it. Pity. Beautiful clock for the rest of it.