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April 2018

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Subject:
Re: R: [TN] R: [TN] PCB failure
From:
Yuan-chia Joyce Koo <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Yuan-chia Joyce Koo <[log in to unmask]>
Date:
Thu, 19 Apr 2018 10:17:45 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (13 lines) 
agree
On Apr 19, 2018, at 10:11 AM, Wayne Showers 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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