I would like to see an image of the full via, top to bottom. But, I see no
evidence that the failure was caused by excessive heat from hand
soldering.. Obviously, they failure could be heat induced, but the board
structures show no signs of heat stress. They didn't put up much of a fight
from what  is visible in the photo.

On Thu, Apr 19, 2018 at 12:49 PM, Zilber Gil <[log in to unmask]> wrote:

> We require 0-5 micron etch back.
> Gave the explanation previously.
> Regards,
> Gil
>
>
>
> נשלח מסמארטפון ה-Samsung Galaxy שלי.
>
>
> -------- הודעה מקורית --------
> מאת: David Hillman <[log in to unmask]>
> תאריך: 19.4.2018 16:43 (GMT+01:00)
> אל: [log in to unmask]
> נושא: Re: [TN] R: [TN] R: [TN] PCB failure
>
> Hi Wayne - etchback isn't necessary for acceptable PTH reliability for some
> products and product use environments so that may not be a contributing
> issue. With that being said, I like etchback as it always makes the inner
> connections better/more robust and in some product use environments having
> etchback is necessary for long term product life. One question we haven't
> asked as a group is " was etchback required in the fabrication
> requirements?"
>
> Dave
>
> On Thu, Apr 19, 2018 at 9:11 AM, Wayne Showers <
> [log in to unmask]
> > wrote:
>
> > The real problem is that this PCB has no etchback, positive or negative
> > (PCBs are defective).  As far as resin recession, yes the processing
> > probably caused the separation, but once again, the PCB has no etchback.
> >
> > I would send that cross-section image to the PCB supplier and asked them
> > if this is typical.  I suspect that they will realize it is a trap and
> > either offer a crazy answer or admit that their is no etchback and offer
> to
> > re-run/replace the PCBs.
> >
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