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