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Possibly dripped there from a leaky cap, or a service / inspection once. Just sat there, heated up and slowly corroded. I've seen similar, but for other reasons -1st generation "lead-free" vehicle electronics were a mess. So many metals that didn't get on with each other :-)The only way I found - was to remove the component - clean off all solder / residue with the usual chemicals - first active, then iso, as you said - then we applieda high-flux (brushed on) liquid solder. forgot what it was called - then replaced new components.With the edge connectors - we removed the bodge and again passive plated the entire edge with an active gold / silver solution - enough to thicken it up.Usually also, bent out the edge connector pins as well.
About that pad.... does it really need to be repaired? It looks like it's just a ground plane, and there are at least 6 pads that are doing the same thing AND the back side. If receiving side is doing the same, then you could leave that alone. I'd just clean it well so the corrosion won't spread.
though i did a bit of a brushing with mild muriatic acid last night
thanks -maybe you could be MORE condescending? or perhaps i wasn't being clear enough
Quote from: jaunty on September 10, 2018, 04:18:09 amthanks -maybe you could be MORE condescending? or perhaps i wasn't being clear enoughSorry, my post was not meant in that way, but when I see multiple posts roughly about the same topic, I don't know what your expertise level is. You could be a complete noob or one of the authors in the pace worldwide video. I also don't read all the responses if I'm generally not interested in your topic. You may have clarified what you were looking or later, but I likely didn't read it.