Electronics Forum | Wed Mar 01 02:10:05 EST 2017 | soldertraining
Hi! I am Bob and pls forgive me if technical words I use are wrong. What may cause the BGA solder pad lift before or after reball? I am having problems where solder pad lifted during removal of bad solder ball. It also occurred during reball, where t
Electronics Forum | Tue Jun 26 16:43:19 EDT 2001 | CPI
Yes a 6 mil solder deposite will reduce to approx 50% of it's original size. Does this happen on only 1 BGA? Is the BGA that its happening on have smaller balls than the others, what I'm getting to is, are you sure you are depositing the proper amo
Electronics Forum | Wed Dec 26 11:01:31 EST 2007 | swag
Thanks, rywman. I do have a solder sample along with dummy BGA's so we should have what we need. This BGA is actually 1152 pins (I didn't have that right in my original post). The bad part is that we are building only one board only and the actua
Electronics Forum | Fri Nov 10 17:44:48 EST 2000 | Dave F
In response to your questions: Is the embrittlement from excess gold in lead / tin solder connections bad? It can be vereeee bad. Does it affect all plating processes the same? Give us a break and read the SMTnet Archives, for instance: BGA prob
Electronics Forum | Wed Mar 14 16:30:02 EST 2001 | CAL
Reading x-rays is an art. All balls should be symmetrical in size and shape. Please provide more information on your question. Why just opens? If the Balls are not consistently the same in size or shape there is a problem. Larger balls could be from
Electronics Forum | Sat Dec 28 02:58:12 EST 2002 | emeto
If the problem is in the big thermal pad.The surface strains in that pad are different then the others and through the reflow period there is an affinity between them(only if they are too close). I recommend you to reduce the theramal pad. Make smal
Electronics Forum | Thu Feb 14 07:34:10 EST 2008 | jdumont
How many fell off out of your entire lot? What was the soldering quality like on the ones that didn't fall off (xray, visual)? You need to determine if its a random problem or if even the ones that stayed on are barely on and go from there. If the o
Electronics Forum | Wed Sep 29 12:51:55 EDT 1999 | Bob Barr
Never heard of the DRS-22C. I have had a DRS-22 for several years now. Purchased it when we started doing BGA's. The operators like it - good optics (split view), built like a tank, X-Y table easy to manipulate for alignment. I like it because I ca
Electronics Forum | Mon Nov 25 18:43:29 EST 2013 | hegemon
Without the proper tools in house you will not be able to determine anything but the most obvious problems. At minimum, some side looking microscope that would allow visual inspection of a row or two, and to be able to rule out bridging. Using that
Electronics Forum | Tue Feb 29 22:53:13 EST 2000 | KH
I have used both the QX2 and BGA3500 hot air rework system from Metcal; both are great systems; the QX2 is a very simple system for leaded devices, easily trained and very inexpensive compared to SRT, Air Vac, and Conceptronics. The BGA3500 works on
