Electronics Forum | Sat Mar 06 02:54:25 EST 2004 | tommy
1)Solder paste selection 2)Reflow profile.Focus on soaking and TAL. 3)Moisture control for BGA. 4)Maybe the BGA solder ball already with void. 5)PCB design.Any via on bga land? 6)Solder masking type. 7)Solder paste volume apply on land. 8)IPC class 3
Electronics Forum | Thu Jan 19 13:28:19 EST 2012 | waveroom
Two pictures. Dark circles around solder joints. leaded solder, water soluble flux, selective soldering and seeing these dark lines circling around solder joints. Can not remove this either. Any idea what is making this occur??? See attached photos
Electronics Forum | Tue Nov 13 12:25:12 EST 2007 | gradloff
I have a thick board with ground planes that will be soldered by hand with a mildly active solder/flux. X-ray confirmed that solder was added to the top of the joint causing a void between the bottom and top solder joint. Other than the mildly acti
Electronics Forum | Sun Oct 19 05:58:08 EDT 2008 | bejingaf
Hello! I'd like to now if you have similar requests from your customers as we have that we are not alloved to manually repair solder joints after reflow or wave soldering process? Regards!
Electronics Forum | Thu Oct 26 03:20:13 EDT 2000 | heccles
What would be a typical thermal test regime to verify the quality of solder joints for high specification applications - what would be the specific benefits of utilizing a "HALT" process over other traditional test techniques ?
Electronics Forum | Wed Nov 14 10:51:34 EST 2007 | mumtaz
Yes. Baking boards is best. Hitting the hamer on the head!
Electronics Forum | Tue Oct 21 10:25:05 EDT 2008 | hussman
They must live in a perfect world where they give you perfect boards and perfects parts.
Electronics Forum | Tue Oct 21 13:23:47 EDT 2008 | hussman
Don't tell them you repaired them.
Electronics Forum | Thu Oct 31 11:08:12 EST 2002 | soupatech
Being very new to SMT I won't assume I know what the problem is but.... I had lots of air pockets in solder joints, 95% of the boards. Everyone I spoke to thought it was a problem with my process but when one board was sent to our supplier they admi
Electronics Forum | Wed Nov 14 01:18:20 EST 2007 | reypal
How about your bare pcb handling? do you stuff smd component prior hand soldering? you can try to bake the pcb and then see if this problem still exist.
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