Re: Dark deposit on pins near leaking SMD electrolytic caps


Hi Chris,

The classic recipe for battery leakage on PCBs is a toothbrush scrub (actually
short bristled hogs hair) in a white vinegar rinse. Follow that with a scrub
in a baking soda rinse to neutralize the acid.
Thanks for the recipe, in old times most cells were acidic so baking soda was first but for an alkaline electrolyte vinegar first makes sense. 409 is very basic (probably too much, Simple Green is suggested) so it might do the job of baking soda.

One mystery is why only some IC pins get this dark deposit, there are ICs nearby with no deposit and in some ICs only few pins would get this deposit. It is not always the closest to the cap.


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