Hell, It ain't that exciting but it sure got my attention. I asked Steve, again, to post three pics on his outstanding site. The first shows the overall view, top down of course, of solder columns at 10x. The second has a bug in it at 60x. Probably one of those little brown "lady bug" like creatures infesting us all (damn they're bad, aren't they?). The third is a more slanted view showing the "columns" that seem partially formed solder joints that didn't take. The strange thing, to me, is the CSP/DSP parts fell off the board on arrival. However, a large ceramic BGA on the same board exhibited perfect solder ball squat and joint formation. My question is how do these columns form into almost perfect structures without reflowing around and into the balls? Eutectic means, I'm told, going from a solid state to a liquid state without going through a plastic state. Again, how did this occur without reflowing and effecting a solder joint? MoonMan --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------