[SI-LIST] Re: Fixing a black pad

Gil,

I'm wondering if the black pad is silver (Ag) oxide.  Have you recently 
switched to lead (Pb) free processing?  Or worse, has your BGA vendor 
begun to supply you with lead free parts without your knowledge? 
Unfortunately, I'm not very knowledgeable when it comes to silver solder 
processes, but would like to hear from anyone else with more knowledge 
than I in this area.  We may all need to learn about this quickly as the 
electronics industry makes the lead-free transition.

     -Bill


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      /         billw@xxxxxxxxxxx         /
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    / Advanced Electronic Concepts, LLC /
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=========================================================
Zilber Gil wrote:
> Hello all,
> After removing a BGA components a black pads was seen on some of the
> pads. Is it possible to fix it? If trying to use activated flux it is
> possible to coat the pad with solder (receive back the wetting). Does
> the black pad phenomenon will appear again on this pad (will I encounter
> it later on other pads?)?
> 
>  
> 
> Thanks,
> 
> Gil Zilber
> 
> Elta systems
> 
> 
> 
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