Hi all,
Is anyone used to encounter PTH(plated through hole) crystal component(Not SMT component) become malfunction when the environment humidity is more than 90%? It is happening here...It is very weird that crystal become OK when humidity is back to normal (Around 40%). We simulate the failure in the chamber..
The problem disappear when they clean the PCBA bottom side, especially on the crystal area(Bottom side)....Some people think that this could be flux residue related issue..However, the PCBA look clean..I don't think this is flux residue that lead to this problem..As far as I know if it is related to flux residue, the problem would not go away immediately when the humidity drop to 40% (Temperature is remain the same during the study) unless there is drastic temperature change take place which burn away the flux residue..
However, it is also weird and remain unexplainable as the problem disappear after they clean it as mentioned above..
Note: Our PCBA went through non-clean process..
Anyone has experience the same problem, pls do share with me..I am glad to hear from you..
Thanks, Sean
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