Electronics Forum | Wed Aug 11 06:27:07 EDT 2021 | danisa
Hi all, The PCBA was swollen after SMD It is hard PCBA with 6 layers and SMD both sides Defect rate: ~ 5% Phenomenon: swell at the same side, same position (at 2 IC positions). Did not find any abnormality in SMD process as well as storage condition.
Electronics Forum | Thu Jan 15 15:08:43 EST 2004 | mrmaint
Are your qfp's being stored properly. I have seen this in the past and it turned out to be a moisture issue. We saw most of the problems on the corners. The component would swell during the reflow process thus lifting the corners. After baking the re
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% in the machine direction and 2% in the cross direction (due to moisture absorption). This swelling is largely reversible when the paper is redried
