It is very rare. Have you tried to poke it with an exacto to make sure it isn't just stuck to the top as debris ?
If it is adhered to the part It is indicative of poor cleaning practices which should cause some concern...
It appears to be on the surface so removing it and touching up any damaged Soldermask or surface finish appears as though it would not adversely affect form, fit or function.
James Hofer
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-----Original Message-----
From: Watson, Howard August [mailto:[log in to unmask]]
Sent: Thursday, June 04, 2015 10:04 AM
To: TechNet E-Mail Forum; James
Subject: RE: [TN] PCB blob defect
James,
Yes, I concur. Not knowing anything about that process, is this something that would be extremely rare?
Howard A. Watson
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of James
Sent: Thursday, June 04, 2015 9:34 AM
To: [log in to unmask]
Subject: Re: [TN] PCB blob defect
That is a blob of resist on the surface
James Hofer
General Manager
Accurate Circuit Engineering (ACE)
3019 S. Kilson Dr.
Santa Ana CA 92707-4202
[log in to unmask]
(714) 546-2162 wk
(714) 473-6127 cell
AS9100C / ITAR
ISO9001
MIL-PRF-31032 and 55110
Follow us on Facebook!
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Vladimir Igoshev
Sent: Tuesday, June 02, 2015 4:10 PM
To: [log in to unmask]
Subject: Re: [TN] PCB blob defect
It's definitely done thing on top of the board. To be more certain, we'd need the board for analysis.
Regards,
Vladimir
Sent from my BlackBerry 10 smartphone on the Rogers network.
Original Message
From: Watson, Howard August
Sent: Tuesday, June 2, 2015 18:56
To: [log in to unmask]
Reply To: TechNet E-Mail Forum
Subject: [TN] PCB blob defect
Hi all,
My PCB fab knowledge is limited, and a very unusual defect was discovered (too late) in assembly. I'm wondering if anyone has seen something like this before, or has an idea what this could be. The blue color seems noteworthy to me. This is for IPC class III, space. I will return this to the fabricator, but I wanted to get educated in case there is a debate regarding the cause. Thanks for your help!
Steve put the pictures here:
http://stevezeva.homestead.com/Howards_Blob.jpg
http://stevezeva.homestead.com/Howards_Blob_close.jpg
Howard A. Watson
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