Feather M4 Express and NEOPXL8 M4 Featherwing problems

Hi all. I might have sorted this out, and how embarrassing. While going over (and over) my procedure in my head, I remembered another soldering project I had done recently, nothing to do with electronics. Light bulb moment, long story short, I have been using absolutely the wrong soldering flux for electronics, and I guess residual acid has been gradual chewing into the circuit board, hence the changing symptoms I had been seeing. I changed flux, redid another feather/wing combo, and it worked like a charm. Still a long way to go with the project, but there is light (LEDs) at the end of the tunnel. So embarrassing, an old head taking on a new challenge is a wicked combination.

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