Electronics Forum | Thu Oct 30 19:59:05 EDT 2008 | gregoryyork
solder ball was caused by hasl process not reflow. seen before many times, look around wells of smt on bare boards should be more of them
Electronics Forum | Mon Nov 02 17:45:46 EST 1998 | ChrisK
In my experience, solder balls are normally caused by only a few things. In order of likelyhood: 1) Water based fluxes (VOC-Free)not having the water carrier completely dried from the board before going into the solder. I.E, too fast conveyor spee
Electronics Forum | Fri May 12 07:32:13 EDT 2000 | David Hatherall
Help. We are about to start a project to test the suitability of attaching a ceramic thick film hybrid to a pcb using solder balls. we have no previous experience of this technique and would like a few pointers in the right direction.. eg recommend
Electronics Forum | Mon Oct 27 14:28:19 EDT 2008 | patrickbruneel
Do you refer to the highlight in the picture as a solderball? Looks more like copper to me.
Electronics Forum | Fri Oct 30 08:22:57 EST 1998 | Michael Nguyen
I finally got my problem figured out on the bridging, the only thing I'm finding is that I notice some litlte solder balls on the bottom of the board. Is that normal? Is that why I'm getting bridges? Has anyone came across this problem and pass the i
Electronics Forum | Tue Nov 04 12:58:17 EST 2008 | smt123
I have to agree with Patrick here. This image appears to show a board that is NOT HASL as there is what appears to be a copper pad in the upper portion of the image. But then again the arrow tip appears to be white and I woudl expect that to be red s
Electronics Forum | Mon May 15 20:10:27 EDT 2000 | Dave F
David: How about starting with MCMs? IPC docs are: * 2225 - Sectional Design Standard for Organic Multichip Modules (MCM-L) and MCM-L Assemblies * DD-135 - Qualification Testing for Deposited Organic Interlayer Dielectric Materials for Multichip
Electronics Forum | Wed May 02 13:59:20 EDT 2001 | kt
Can anyone tell me what they think is the main cause of excessive solder at the end of the lead after wave. These are not solder peaks as if the leads were cold. It is a well wetted ball of solder on end of the lead. Also, some times you see excessiv
Electronics Forum | Tue Jul 15 15:46:05 EDT 2008 | slthomas
Can you describe your solder balls...mid-chip solder balls, "splatter" around pads, etc.?
Electronics Forum | Sat Jul 03 02:15:05 EDT 2004 | yukim
So did you change the solder paste? And did it work? What solder paste is it?
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