Electronics Forum | Mon Sep 15 06:14:49 EDT 2008 | milas
Hi Has anyone experienced laminateand BGA cracking on ENIG finish boards built using a lead free process? The laminate is cracked directly underneath the pad where the solder joint has cracked. We have confirmed the cracking via Microsectioning. We
Electronics Forum | Thu Sep 18 13:55:48 EDT 2008 | vladig
Any crack in laminate caused by excessive flexure would look exactly like the one in the image. Vlad
Electronics Forum | Mon Sep 15 20:17:52 EDT 2008 | vladig
Hi Adam, Since you don't see any cracking right after re-flow, then the most probable cause is the board flexture during handling/assembly. I bet you see cracking in the outer row(s) and mainly in the corner balls. Regards, Vlad
Electronics Forum | Tue Feb 16 12:44:05 EST 2010 | esoderberg
95%+ of my boards are small and therefore are panelized using the V-score technique. Getting a lot of resistor cracking even though the resistor is layed out to be perpendicular to the long board edge. What dimension should be used from the board e
Electronics Forum | Tue Feb 23 09:48:26 EST 2010 | dyoungquist
How are you sepatating your boards out of the panel? If you are flexing them to break the V-score, this could be what is causing the resistors to crack.
Electronics Forum | Tue Feb 23 11:05:46 EST 2010 | kjs123p
We had this same problem several years ago. The caps and resistors were cracking when we snapped the boards apart. We now use a pizza cutter style depanelizer. A couple of manufacturers that I know of are CAB and Fancort. I hope this helps.
Electronics Forum | Tue Sep 16 22:29:25 EDT 2008 | davef
Would you attach pix of the sections?
Electronics Forum | Thu Sep 18 04:57:48 EDT 2008 | milas
Hi Please see attachment Adam
Electronics Forum | Thu Sep 18 08:57:39 EDT 2008 | vladig
It looks "normal" for that type of failure Vlad
Electronics Forum | Thu Sep 18 11:07:05 EDT 2008 | milas
Hi Vlad Please explain "Normal" ? Adam