There is no other problem, it is just the appearance of the boards. You know
these are for Medical customers, so we have to follow to the print....
Thanks,
Krishnan
On Tue, Aug 10, 2010 at 10:42 AM, Robert Kondner
<[log in to unmask]>wrote:
> Hi,
>
> Other than he color is there a problem with the boards?
>
> Bob Kondner
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Tan Geok Ang
> Sent: Monday, August 09, 2010 9:47 PM
> To: [log in to unmask]
> Subject: Re: [TN] PCB Discoloration
>
> Believed that these boards might have/ were "jammed thus heated" within
> the wave soldering process which resulted in this issue?
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Krishnan
> (Radhakrishnan) Chezhian
> Sent: Tuesday, 10 August 2010 6:54 AM
> To: [log in to unmask]
> Subject: Re: [TN] PCB Discoloration
>
> Hi All,
>
> This is a double sided board, we did not see this defect when the boards
> were shipped. This is a pretty straight forward process for double sided
> boards with red soldermask. The only heat cycle it sees is during the
> soldermask pre-cure and final cure. So based onour records and data we
> did
> not see any abnormality during the curing process. Also the only other
> area
> we suspected was at final visual inspection where an inspector found
> exposed
> copper and touched-up the copper surface with mask and wanted to bake
> it. So
> we baked a board at 250F for 60 hours, simulating extreme conditions and
> did
> not see any discoloration, at least to this extent.
> We are not sure what processes the boards go through at the assembler in
> Jabil Shanghai, we are getting back some baords for FA. So we are open
> to
> resolve this issue ad if anyone has any suggestions pls feel free to
> comment.....
>
> Thanks,
> Krishnan
>
>
>
> On Tue, Aug 10, 2010 at 1:12 AM, Genny Gibbard
> <[log in to unmask]>wrote:
>
> > I am late into this discussion, since I have been on holidays, but did
> > anyone consider the possibility that the layers were stacked together
> in
> > the wrong order internally? I have seen colour changes like that on
> one
> > batch that was made wrong. If the internal copper plane layer is
> closer
> > to one surface than it normally should be, it would appear darker on
> one
> > side and lighter on the other than normal, which is what I see with
> the
> > ring.
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]] On Behalf Of Dan Skweres
> > Sent: July 30, 2010 10:59 AM
> > To: [log in to unmask]
> > Subject: Re: [TN] PCB Discoloration
> >
> > Looks almost like one is FR-4 and the other is Polyimide. There was
> > mention that they are from different lots. Call the supplier and see.
> > Perhaps they (the board supplier) messed up and pulled one sheet of
> > Polyimide and figured that it would be okay to send based on the fact
> it
> > met or exceeded requirements per print.
> > Dan S.
> > ----- Original Message -----
> > From: "Steve Gregory" <[log in to unmask]>
> > To: <[log in to unmask]>
> > Sent: Thursday, July 29, 2010 9:34 PM
> > Subject: Re: [TN] PCB Discoloration
> >
> >
> > > Hi Linda!
> > >
> > > While discoloration in itself is not a defect, I would be a little
> > > worried about these seven boards. Especially since the rest of the
> lot
> >
> > > are not discolored like this:
> > >
> > >
> > > http://stevezeva.homestead.com/PCB_Discoloration1.jpg
> > >
> > >
> > >
> > > I don't see any delamination in the photos, but it sure looks like
> the
> >
> > > boards got pretty toasty. I wonder if it was because the boards were
> > > sitting over a preheater or hot plate too long. From the looks of
> the
> > > components on the board, most of it was probably hand soldered
> (those
> > > PTH caps converted to SMT couldn't have taken reflow), and I imagine
> > > that the solid plane on on the backside of the board was a real
> > heatsink.
> > > Preheating the board would have helped with soldering the PEM nuts
> for
> >
> > > sure, but maybe the preheater was set too high. I know a Hakko IR
> > > preheater can smoke a board if you're not careful (not that I've
> ever
> > > done that, but I know a friend of a friend who did. Hehehehe).
> > >
> > >
> > >
> > > Anyways, those seven boards saw more heat than the rest of them did
> > > based on the appearance in the photos. I don't think I'd buy off on
> > them...
> > >
> > >
> > >
> > > Steve
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > From: Linda Langley [mailto:[log in to unmask]]
> > > Sent: Thursday, July 29, 2010 1:42 PM
> > > To: Steve Gregory
> > > Subject: FW: PCB Discoloration
> > >
> > >
> > >
> > > Hi Steve,
> > >
> > >
> > >
> > > Here I go again asking for help from my experts! Can you please post
> > > these pictures? So I don't have to bother the whole forum, would you
> > > know the name of the board guru that could answer my questions?
> > >
> > >
> > >
> > > I am not sure if the discoloration is a defect, is this a form of
> > > delaminating? Why would only seven boards turn this color? They are
> > > all from the same lot.
> > >
> > >
> > >
> > > Any information will be greatly appreciated.
> > >
> > >
> > >
> > >
> > > Linda Langley CIT
> > >
> > > Training Specialist
> > >
> > > Jabil Circuit
> > >
> > > 248-292-6176
> >
> >
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