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Water is normally the source of the problem I described, solder turning into something with the consistency of grey granite which WILL NOT MELT no matter how hard you try.
We get a lot of PCBs back which have been used in supposedly watertight cabinets in outdoor locations. Sometimes, the cabinets aren't assembled as 'watertightly' as we would like.
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Well, as per the Mag Loop thread, it does seem that some expensive bits of kit which are intended to operate outside still fail due the effects of atmospheric moisture.
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