On Sun, 2006-10-22 at 04:54 +0300, Vasile Surducan wrote: > On 10/22/06, Marcel Duchamp wrote: > > Shawn Wilton wrote: > > > Leave them on the board. If you can, bring them out to pads somewhere else > > > so you can attach to them in the future if you need to. > > > > > > We use LARGE BGA's and on many occasions we have needed to tap in to various > > > unrouted pads. > > > > Shawn, > > Do you ever have production problems with the BGA in terms of opens, > > shorts, etc.? > > I'm having some major problems lately with a small BGA - only 32 contacts. > > I hope you're not solder them manually with reflow tehnique. > The ideea is to build at least 10 pcs even if you need two prototypes. Then > you have a good chance. About the only time I've seen an XRay machine as an integral part in my electronics work is when dealing with large BGA packages... > BTW, some BGA have 1508 pins... Or more, the Xilinx Vertex 4's I've worked with have 1760 pins, ouch... TTYL -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist