Looks like this is the beginning of my nightmare with more to come after
reading those valuable feedback by technetters.

No,I haven't try immersion silver but certainly I will explore it.Anyone can
let  me what is the cost differences between Immersion silver and ENIG?

Thank you.

----- Original Message -----
From: "Lee Parker" <[log in to unmask]>
To: "'TechNet E-Mail Forum'" <[log in to unmask]>; "'sumxp'" <[log in to unmask]>
Sent: Saturday, January 14, 2006 1:34 AM
Subject: RE: [TN] enig bad board


> Sumxp
>
> It is likely the thickness of the gold is inadequate and the underlying
> nickel has oxidized. I would measure the gold thickness (XRF) and compare
> it to the minimum specified. The silver color after erasing is most likely
> the nickel that is under the gold and with the oxides removed.
>
> There are many other alternatives these days to ENIG such as immersion
> silver. Have you evaluated into any of these?
>
> Best regards
>
> Lee
>
> J. L. Parker Ph.D.
> JLP Consultants LLC
> (804) 779 3389
>
>
> Best regards
>
> Lee
>
> J. L. Parker Ph.D.
> JLP Consultants LLC
> (804) 779 3389
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of sumxp
> Sent: Friday, January 13, 2006 10:48 AM
> To: [log in to unmask]
> Subject: [TN] enig bad board
>
> Hi,
>
> We noticed few ENIG bga pads black in color instead of gold.It turn silver
> when use eraser to remove away the black color pad.What is the defect
> mode?
> Any reliability issue?Is it advisable to continue using these pcbs?
>
> Thanks......
>
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>
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