It varies by brand and part number. At 02:01 PM 9/14/2012, Robert Kondner wrote: >Hi, > > Does anyone know about the TCE of via plug material? I am trying to get a >material number of what was used. This was the first board we ever ran with >via plugging but I would think that is a well-known process? > >Bob K. > >-----Original Message----- >From: TechNet [mailto:[log in to unmask]] On Behalf Of Jason Zhao >Sent: Friday, September 14, 2012 12:52 PM >To: [log in to unmask] >Subject: Re: [TN] Broken Vias > >Bob, > >Xsection will show you where the opens occur. Possibilities are: copper >plating folds; thin copper; corner crack; post separation; separation due to >no wraparound; etc. Then we can determine the root causes from there (there >are too many to guess now). Looking forward to some pictures. > >Best Regards > >Jason Zhao >VP of North America Operations >Sunshine Circuits >3400 Silverstone Drive, Suite 139, Plano, TX 75023 US Cell 510-468-4412, >China Cell 131-62722392 www.sunshinepcbgroup.com > >-----Original Message----- >From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner >Sent: Friday, September 14, 2012 10:18 AM >To: [log in to unmask] >Subject: [TN] Broken Vias > >Hi, > > > >A small company in the area has a board with two very expensive parts, about >$3K each part. They built 30 boards and had lots of open via connections. >They are getting cross sections now on some bad vias. In addition to many >bad vias there was some board warp. Sorry I don't have any hard numbers on >bad via counts or warp. > > > >These were 10 mil holes in .062 material, a 6:1 aspect ratio, should be >easy. Vias were plugged and plated so they could be used as flying probe >test points. > > > >After reflow assembly the boards were run on a wave machine using a mask >where about 25% of the board was exposed to the wave. Everything lead free. > > > >Question: > > > >Can folks suggest lists of items we can check, measure or inquire into? Any >guesses or ideas as what might be going on? > > > >Thanks, > >Bob K. > > > >______________________________________________________________________ >This email has been scanned by the Symantec Email Security.cloud service. >For more information please contact helpdesk at x2960 or [log in to unmask] >______________________________________________________________________ > > >______________________________________________________________________ >This email has been scanned by the Symantec Email Security.cloud service. >For more information please contact helpdesk at x2960 or [log in to unmask] >______________________________________________________________________ > > >______________________________________________________________________ >This email has been scanned by the Symantec Email Security.cloud service. >For more information please contact helpdesk at x2960 or [log in to unmask] >______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________