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Recently, a serious crack issue for a commercial BGA has taken place frequently in the normal PCBA assembly line, which has lead to abnormal failure rate spikes in the first pass yield trend chart, and caused line down issue already. Both cross section and Dye & Pry has been carried out to find out the fracture mode in the suspected pin of the failed unit. The cross section result shows that both...
The differential pressure method is widely used nowadays for air leak detection. In this method, a master tank, which is leak-tight, and a work/tested tank are simultaneously charged to a certain pressure and then closed from each other. If there is air leak in the tested tank, the air leak can be detected from the differential pressure occurs between the two tanks. However, the detection process...
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