I have a Smoothie board that shorted between traces. I suspect contamination in solder resin residue created a path for current between two terminals. I have since removed the board and cleaned the area with soap, hot water and a toothbrush. In the past, I have carefully scraped any carbonized materials out from between the traces and that’s what I did this time… very carefully.
My concern is that it appears I may have exposed a copper layer below. That was a shock. I thought there would be fiberglass between layers. Am I wrong? I’ve included a picture. It shows the back side of the board below a 2 position terminal connector. You can see the exposed edges of copper from each pad… and what appears to be copper exposed between the pads where I would not expect copper!
Anyway… has anyone used something like clear nail polish or something over exposed copper like this to just give it a little bit of additional protection? I just don’t like what I see and I’m a bit nervous to leave it this way. I think the rest of the board got away unscathed.