Electronics Forum | Wed Apr 16 11:20:31 EDT 2003 | russ
What was the original complaint? when you say solder wicked onto top of capacitor do you mean it was dewetted from the board and only on the cap? What type of device showed voiding? how bad was it 20%,50%? I have found that the paste type seems to
Electronics Forum | Thu Jan 14 23:49:00 EST 1999 | Wirat Sriamonkitkul
I saw the problem of void in solder bump or in lead less component or some BGA. But I didn't have standard specification of that void is accept or reject? Do any body have the better idea or suggestion of the criteria ? Thank you, Wirat S. / Jan 15
Electronics Forum | Wed Jan 23 13:48:06 EST 2008 | flipit
You can do a destructive test to sort of check your process. Break off the flipchip and look for voids. I have used Namics 8437-2 for the last 7 or 8 years. Good stuff. Flows under a 0.001" gap with no voids. Chris
Electronics Forum | Wed May 07 08:10:22 EDT 2003 | Pon
Hi all Are there any advice pls. let me know. Our customer Void spec. at BGA and CSP is less than 10%. Usually we found void defect at BGA and CSP component around 2-3 % but sone lot the defect rate is up to 18%. I have read some input from this w
Electronics Forum | Sun Aug 19 15:34:20 EDT 2007 | davef
What are you trying to do: * Improve hole fill? * Reduce PTH voiding? Hole fill: Search the fine SMTnet Archives for stuff like: http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=36063 PTH voiding: Ideally, there are no voids. We're unawar
Electronics Forum | Thu Apr 17 10:38:02 EDT 2003 | davef
While Russ is correct that a little voiding is OK, your level of voiding [customer complains that the solder surface looks bumpy] doesn't give us the ol' warm and fuzzy about their process control. For background: * Search the fine SMTnet Archives.
Electronics Forum | Tue Mar 06 14:10:52 EST 2001 | CAL
Are the voids in the balls of a BGA? Are you verifying this through x-ray if they are? some voids depending on size and location are some what accepted. Solder paste type? Solder paste date code? Humidity high? PCB's been stored in a truck trailer?
Electronics Forum | Thu Feb 21 04:41:37 EST 2008 | mun4o
hi,Toni, we use only FR4.Some of PCB we order in China and Taiwan.With these PCBs we can't any problem.Other PCB we order here in Bulgaria.The problems with voids start last year - we have voids only in PCBs from Bulgarian factory.The process is sam
Electronics Forum | Wed Feb 28 19:44:50 EST 2001 | pzohbon
I am having problems with voids in our soldering process. I believe it to be the fact that we use a no clean flux without control on how the boards are handled (gloves, procedures, etc.) Does anyone have suggestions on the appropriate place to start?
Electronics Forum | Thu Mar 01 11:43:08 EST 2001 | dason_c
Not enough info, when you say no clean flux, is it for wave soldering process, please provide more detail, SMT or wave, is it all the joint which you find the void? Rgds
