Electronics Forum | Mon Aug 11 10:47:40 EDT 2008 | dphilbrick
Sounds like bad BGA's to me. I suspect this is rare but you can get black pad on the BGA attach pads just like you get them on a PCB. Do you have un-processed BGA's?(still in package) I would have one tested (not by the manufacturer)!
Electronics Forum | Wed May 02 12:12:23 EDT 2007 | SWAG
Restrictive carriers or lack of carrier in reflow can cause board warpage = bad for BGA's. Might be something to look at.
Electronics Forum | Sat Dec 24 19:39:43 EST 2011 | dontfeedphils
I've reflowed many different size BGA's in an effort to better the connection and to help the board pass functional test. Using a middle of the road liquid flux and a convection spot rework machine and almost every time I would reflow a failed board
Electronics Forum | Wed Oct 12 11:08:12 EDT 2005 | Mike
Hly, The solder ball in your picture looks just like the countless BGA solder joints that I�ve produced over the past 8+ years. We've had a good number of these joints X-rayed, cross-sectioned, and thermally stressed. Some say that the stretched loo
Electronics Forum | Mon Apr 12 07:44:50 EDT 2004 | wgaffubar
Former company we use to replace No Lead BGA's by using dot dispense to apply eutectic solder to pad with same volume the stencil printer. Current company process removes bad BGA, wicks off solder paste then Hot Gas Reflows new No Lead BGA to bare pa
Electronics Forum | Wed Jan 19 08:44:05 EST 2000 | Rob Douglass
I would like to hear any feedback (good or bad) about the OK Industries BGA-2000 Series BGA and Fine Pitch Rework System. I was not part of the selection process for this machine and my initial opinion is that this unit may be "under-powered". Loo
Electronics Forum | Wed Apr 11 15:56:54 EDT 2007 | egrice
CECIL, I am sorry to hear that you had a bad experience with ERSA. However, one bad experience does not mean that ERSA is a bad company. On the smaller BGA Rework systems, sometimes the sales reps do the installations. Was this the case? If so,
Electronics Forum | Wed Oct 20 16:05:47 EDT 1999 | Mark Charlton
I knew this would happen. Someone wants to rework a bad BGA artwork by cutting a trace and adding a wire under a 292p 1.27mm pitch PBGA. Has anyone done this before? What kind AND size wire do you use? How do you hold it in place during the replc
Electronics Forum | Wed Oct 04 09:55:51 EDT 2006 | borgie
Hi. I have product in lead containing process that consist lead free BGAs and also big ceramic BGAs with high temperature bumbs. Pcb tends to bow in a reflow profile, since I need long preheating times and relatively high peak temperature to melt BG
Electronics Forum | Thu Apr 03 11:17:17 EST 2003 | rdr
Well, first off now I'm just starting to believe that we are fracturing again. But here is some more input D1 ENIG? I would not have thought that they would be but as usual you are probably right. D2 Again I would have to agree about it should affe
