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Black Island/Disco Ball Effect on BGA

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Gman

#42726

Black Island/Disco Ball Effect on BGA | 14 July, 2006

Hello Folks, Has anyone come across this fascinating but undesirable surface appearance of BGA balls. I am not sure what it is called but I came across the term Black Island. To me it looks more like a disco ball. Lets just say the solder ball looks like a disco ball. Defect or no defect?? Anyone?

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#42733

Black Island/Disco Ball Effect on BGA | 17 July, 2006

Do you have an image?

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