As a customer, I would never accept the discolored boards, even if the
function is allright. Would you buy a car with matte paint? Hardly. If you
can give the customer ordinary guarantee, and he accepts that, it might
work, however.
Inge
--------------------------------------------------
From: "Steve Gregory" <[log in to unmask]>
Sent: den 30 July 2010 03:34
To: <[log in to unmask]>
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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