Electronics Forum | Thu Aug 17 07:48:46 EDT 2000 | Kamran.T
Sounds like improper heat distribution! Raise your prheat/soak time to assure even heating of the board∂. Another issue could be the moisture causing this anomaly.
Electronics Forum | Thu Aug 23 00:17:53 EDT 2001 | mugen
Mike, 1) NC process = less BGA voids & void-size 2) longer soak times... Heyz, thanks mate :) ~~~~~~~~~~~~~~ Dave F, tot u were inclinded to the school of thought, that NC process hath higher chance for whining abt voids?
Electronics Forum | Fri Jul 02 11:17:09 EDT 2004 | jdumont
I agree, the flux will probably burn off before it gets to do its job. Def not a good idea....
Electronics Forum | Fri Jul 02 14:15:42 EDT 2004 | bcceng
X-RAY, X-RAY and X-RAY.. to optimize your reflow process when using BGA's you have to use your reflow profile hand to hand with your x-ray process.
Electronics Forum | Sat Jul 03 11:10:48 EDT 2004 | KEN
??? Two assemblies assembled under the same conditions with identical x-ray results can have dramatically different life expectencies. Operating environments will have a direct affect on the product ie. hunidity, temperature swing, temp. duration, v
Electronics Forum | Fri Jul 23 08:59:27 EDT 2004 | davef
For reflow, low soak time and low peak temperatures will help reduce the number of components skewing Search the fine SMTnet Archives. For instance: http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=6071&mc=15
Electronics Forum | Fri Mar 10 12:15:52 EST 2006 | geocominc
Increase Soak time & Slow down line did reduced Delta T by 10+,Fans are at max - Both High -getting closer to target now.Great idea.still more to do .Thanks for advices.
Electronics Forum | Wed Nov 05 13:34:24 EST 2008 | ed_faranda
Exactly what should I look at in my reflow profile? Soak Times, TAL, Peek?!? I am right in the middle of the manufacturing specifications as far as my profile goes.
Electronics Forum | Fri Jul 02 08:06:28 EDT 2004 | davef
Never heard of this either. We'd be concerned about your flux loosing effectiveness over such a long soak and that would result in poor solder connections on all components on your board. Just what is the problem with your BGA that you are trying t
Electronics Forum | Wed Jul 11 13:41:37 EDT 2001 | procon
Hi Chris, Dave F is absolutely correct in his assunption that the leads are hotter than the pads. You must profile from the pads to see the exact temperature that they are reaching. If the entire board reflows properly as you described, don't get ca
