When I have cleaned boards with IPA or other cleaners, I apply the IPA
only in a small spot with a q-tip and then blot it with a paper towel to
help dry it - do not flood the board.
I generally do not recommend cleaning boards, solder flux is
non-conductive and will normally not cause a problem.
I only clean when the solder flux residue is really nasty as might occur
with Kester 44 solder.
Use of a solder with a mildly reactive flux (Kester 385) will reduce the
need for cleaning the board - there is almost no residue.
If you do choose to clean the board, make sure your cleaning work is
complete. While solder flux is non-conductive, the flux plus the
cleaner may be conductive leading to resistive leakage paths. If you can
see any white stuff on the board, you have not done a complete job.
73,
Don W3FPR
On 7/14/2021 6:41 PM, Peter Eijlander (PA0PJE) wrote:
Yes Jerry, isopropyl alcohol does this!
I once cleaned a working print of a GPS receiver with isopropyl
alcohol and it stopped working. Letting it be and trying it again next
day turned out it worked perfectly again.
From then on I leave a PCB to rest after cleaning to have the IPA dry
out completely...
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