Electronics Forum | Thu Aug 17 15:56:07 EDT 2006 | Chunks
Hi McGill, Wow, another "Master" in the making on this forum. Call me what you will, at least I know how to post once.
Electronics Forum | Fri Aug 18 09:28:24 EDT 2006 | russ
okay, very admirable, so you will need to answer the rest of the questions that were posed. Such as the actual profile, storage and handling, registration of paste, etc.... I would lean towards Chunks thoughts myself as well. Russ
Electronics Forum | Mon Aug 21 04:25:24 EDT 2006 | Rob
Larry, Cut the racist generalisations it doesn't help anyone. & if you want to ramble on about evil capitalist flux vs tree hugging flux then set up a new thread. Rob.
Electronics Forum | Thu Aug 24 09:48:56 EDT 2006 | saaitk
We tend to screen paste to the BGA ball. This is quite effective although the repeatability of screening is not always great. Does anyone else use this method and how or have you managed to overcome this repeatability issue.
Electronics Forum | Fri Aug 25 09:25:41 EDT 2006 | YQ Deng
For FR4 ENIG PCB: 1. In a normal condition, what is the broken location after BGA peeled off?(FR4 layer or Ni layer or solder ball) 2. What is the soldering acceptance criteria for BGA in CMK?
Electronics Forum | Thu Sep 07 11:22:33 EDT 2006 | scombs
We had similar problems with some of our products and found the root cause was our ICT fixture. The damaged balls/pads were always in a certain locations so finding the pattern helped. It also didn't help that the boards were ICT'd 10 + times.
Electronics Forum | Wed Oct 04 16:19:54 EDT 2006 | russ
you may want to try a different MFGR of paste, this does help on many occasions. Russ
Electronics Forum | Wed Oct 04 16:47:25 EDT 2006 | russ
very minimal at very few locations. We do not Xray every board but sample them. I think you will find pretty good results here (not perfect) Russ
Electronics Forum | Wed Oct 04 16:54:24 EDT 2006 | cw
OK. Thanks!! Lastly, is it the nature of the chemistry that Sn/Pb solder mixed with Pb-free alloy will be getting voids? If so, what's the physic/chemistry behind it?
Electronics Forum | Thu Oct 05 07:58:05 EDT 2006 | realchunks
I have noticed certain BGAs void more than others. We place about 8 different brands of BGAs and only one brand voids like crazy and we have to adjust for it.
