Printed Circuit Board Assembly & PCB Design Forum
SMT electronics assembly manufacturing forum.
We have seen the black dot on the BGA pad after the componen... - May 04, 2005 by
First, you cannot determine if this is "black pad" by lookin... - May 04, 2005 by davef
I tried soldering to several of the black pads and was succe... - May 05, 2005 by jimmie
Board fab, Defects, Pad coatings, Gold black plague articles... - May 05, 2005 by davef
Just went through this with a customer. Removed BGAs and no... - May 05, 2005 by RDR
Was it determined what caused the flux migration? ... - May 05, 2005 by jimmie
Bad cleaning practice is suspect. It is believed that W.S. ... - May 05, 2005 by RDR
could there have been a solderablity issue with that pad to ... - May 05, 2005 by jimmie
Not in this case, these BGAs were lead free and the profile ... - May 05, 2005 by RDR
Would a lesser degree of black pad still allow solderability... - May 05, 2005 by jimmie
I don't believe that you are seeing black pad. I think you ... - May 05, 2005 by RDR
The black pads that we see are on the BGA component. We rem... - May 05, 2005 by jimmie
You got what I think someone has called a "cold melt". If y... - May 05, 2005 by RDR
Thanks Russ and Dave for time and patience. Best regards ... - May 05, 2005 by jimmie
Jimmie