Electronics Forum | Mon Mar 12 10:13:43 EST 2001 | CAL
At APEX I was able to witness the BEAM WORKS Selective Laser Soldering machine operate.Truly impressive. When they told me they could solder a BGA component, I old them they were HIGH as a kite. The board they demonstrated had 4 BGA's on it. When the
Electronics Forum | Tue Mar 13 20:25:39 EST 2001 | davef
So, what is not soldering? Pads er test points? I assume the holes are unsupported, right? Tell us more about the test points. Are they the kind with the little pastic shoulders [on the primary side] that keep them from falling through the hole?
Electronics Forum | Thu Mar 15 17:19:12 EST 2001 | mparker
Are the tin/lead ratios compatible betweem HASL and wave solder? Probably are, just a remote possibility. Flux application is? bubbler, sprayer? Either way, are you getting good misting, coverage on those teeny 0.5mm test points? If not, then no
Electronics Forum | Tue Mar 13 11:50:21 EST 2001 | gsmguru
Here is some general things I usually ask myself when having trouble with BGA's What type of BGA ? Pitch/Bump Dia etc. Smaller bumps sizes & tighter pitches require more attention. This also impacts stencil aperature design & paste selection. Was
Electronics Forum | Tue Mar 13 14:17:00 EST 2001 | blair
Thanks a lot for the response 1) there are 8 BGA on this board 6 PBGA, 1 TBGA and 1 ESBGA (metal lid). They are dispersed over the board (approx 11"* 14") 2) Is there a tool to use to understand pitch/bump size and stencil aperture (optimized)? 3) Y
Electronics Forum | Tue Mar 13 17:26:07 EST 2001 | blair
1) We could press on BGAs and the boards would boot 2) This is basic boot up yield 3) We are now getting stpe by step inspection data going fwd. 4) So, Stencil design could be a critical factor. Any documented guidelines? 5) Yes DFX was done - mostl
Electronics Forum | Wed Mar 14 18:29:04 EST 2001 | mparker
The basic rule of thumb (info current as of 9/2000, from Ceeris and others) is the 10X multiplier for each major process step. Catching a defect and correcting in SMT will cost $0.10 each. (think about $.04 placement cost, stop line time, operator h
Electronics Forum | Thu Mar 15 18:27:40 EST 2001 | traviss
Like I said it was only a rumor I heard but intrigued me enough to play around with it one day. The lambda wave worked better than the chip wave did with makes me believe it was the surface tension of the solder not melting the already soldered parts
Electronics Forum | Fri Mar 16 07:40:16 EST 2001 | C. Robert Nelms
David Fish alerted me to this dialogue, after visiting my web site. I am one of the "anal" consultants that are trying to help people "learn from things that go wrong." I don't know where to start. Perhaps by asking you not to lump all of us toget
Electronics Forum | Fri Mar 16 07:46:56 EST 2001 | C. Robert Nelms
David Thanks for telling me about this web-site! Great site! I very much appreciated this message. To be honest, after reading some of the other messages here on this forum, I almost decided that this site was not for me. Seems like most / all o