Seldom. I have seen it a couple of times (many years ago with smaller Taiwan suppliers). Cracking around the part where the through-hole plating connects to the copper on the surface. I believe it’s caused by poor control of chemicals or purity in the production process.
Frankly speaking, I would have discarded the entire batch upon finding bad vias. The later failures are almost inevitable. They probably discarded a bunch before shipping them too (assuming the boards were tested).
Прочитайте больше: Контроль качества & Тестирование
#Сборка печатной платы #Тестирование печатной платы
