Electronics Forum | Wed Mar 19 20:40:27 EST 2003 | arminski
Vapor Phase process can do reflow from 4 to 5 times!
Electronics Forum | Thu Mar 20 09:40:33 EST 2003 | russ
Are you warping the BGA or the PCB? Russ
Electronics Forum | Thu Mar 13 19:11:03 EST 2003 | Wes
Does a third solder reflow compromise component and solder reliability? We find that the only way to rework a particular BGA without warpage is to reflow the entire board.
Electronics Forum | Fri Mar 14 04:29:06 EST 2003 | emeto
Hi, It's not recomended to do more reflows.Reliability of the boards decreases and a lot of defects appear.Try to repair other way- hot air or something like that.(main is to be local)
Electronics Forum | Wed Mar 19 21:01:49 EST 2003 | Rob
I would suggest creating a special reflow profile, heating the board up to 130C about 50 c below eutectic point (183C). Then applying heat to only the BGA, this will prevent thermal shock to surrounding components.
Electronics Forum | Thu Mar 20 14:17:39 EST 2003 | MA/NY DDave
Hi I don't think I will enter this too much except for one of your questions. YES multiple reflows affect reliability. Heck most everything affects reliability. Aggressive Heat cycles or Heat always affects the final MTBF reliability number. The
Electronics Forum | Wed Mar 19 16:12:51 EST 2003 | Sudhir
I would suggest to have a rework station to rework only a single component we are having a genrad rework station to do these things
Electronics Forum | Fri Mar 21 20:21:41 EST 2003 | Grant
Hi, I can verify that, and we have done 2 or more reflows with prototypes, using vapor phase reflow, and because there is no oxygen, the result is good, and you cannot tell the difference between the first reflow, and the 3rd. We are getting a vap
Electronics Forum | Thu Mar 15 10:28:46 EDT 2007 | cecil
Just askin but why would someone even want to subject an assembly to even 6 reflow cycles? As far as how many cycles that an assembly can be subjected to, wouldn't that be determined my your components?
Electronics Forum | Thu Mar 15 21:09:07 EDT 2007 | KEN
Cecil, the board is a component.
