Anyone have data as to what can happen if you remove (should actually say
ATTEMPT to remove) rosin flux residues with DI water?
 
Long story short, we buy a transformer that the mfr told me is soldered with
rosin, medium activity flux.  Their cleaning process is  "scrape flux
residues with a knife"....enough said about that...  We solder with organic
high activity and clean with DI water.  Guess what - return from field with
fire on the pcb...burned out a trace through the PCB under the power pin of
the transformer.  Since learning of the above info, I am inclined to think
maybe the rosin residue could have trapped water or OR flux / flux residues
and created a nice little corrosion spot.
 
Anyone have opinions or experience on what can happen if you try to clean
the "no clean" with just water?
 
 

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