I have a few assemblies that a customer had asked me to look at and I
noticed an oddity around the vias. It looks like there is delamination
around the vias. Steve was kind enough to post these photo's on his web
page for all to view. I need to know if this is delamination or just
haloing. I saw an issue like this a long time ago (15 years ago) and at that
time we scrapped them because we didn't know what the issue was caused by.
Some at that time thought the drill bit for that size was either pushed to fast
through the material causing a slight delanmination or the drill bit was
dull.
I appreciate any assistance or thoughts on the issue. I have already
suggested that a cross section may have to be completed.
Thanks in advance.
Kathy