Electronics Forum | Thu Sep 05 03:23:14 EDT 2002 | manic
Hi, I encountered a problem with pbga. One edge either warp downwards or upwards creating bridging or open. This pbga have fr4 at the bottom (compound molding at the top). The fr4 is bigger than the top compound by 3mm at each edge. Pls help. Than
Electronics Forum | Fri Mar 07 03:37:26 EST 2003 | emeto
Hi Ygwie, My experience shows there is not unique answer.Actually it depends on design,printing reflow or wave.It might be top side with lesser cmps.Top side might have fine pitch or BGA or CSP,LLGA ....,so you have better planarity when the PCB is b
Electronics Forum | Fri Mar 05 07:47:29 EST 2010 | kpm135
How is that going to help hold a BGA to the bottom of the board during secondary reflow?
Electronics Forum | Thu Oct 13 10:44:18 EDT 2011 | spitkis2
Have you considered adding adhesive / epoxy at the corners of the BGA to secure it in place?
Electronics Forum | Thu Oct 13 00:18:36 EDT 2011 | kemasta
Hi! We have many PCBA with double side BGA mounted, current practice is to put the board on reflow pallet (durastone 761) to cover BGA at bottom side so that the BGA won't lift after go through reflow oven, but this created 2 problems:- 1) We need t
Electronics Forum | Fri Jul 08 18:48:50 EDT 2005 | mdang
Hi, We are a Contract Manufacturing and have a project which has a few Xilinx BGA on top and bottom side. Does anyone run a cross this or have any suggestion on how to reflow them. Thank you, -Michael
Electronics Forum | Wed Sep 08 16:21:01 EDT 1999 | Chris McDonald
Has anybody have any experience with Top placement of BGA's. GLue descretes on bottom and then wavesolder.?
Electronics Forum | Thu Feb 25 10:54:03 EST 2010 | duanebrayton
We are a small Contract Manufacturer and have received a project which has BGA's on top & bottom. 2 larger BGA's on one side (~_20x20mm) & 3 smaller BGA's (~_8x8mm) on the other. we plan on running the side with the smaller BGA's first but need som
Electronics Forum | Thu Jul 15 12:02:38 EDT 2004 | Yngwie
We have massive void problems on one of the BGA populated on the bottom side of the board. The board have 6 BGAs on the top and 1 on the bottom. No voids were observed during the first reflow (we reflowed bottom side first), but after the second refl
Electronics Forum | Fri Jul 16 03:35:34 EDT 2004 | Yngwie
We have massive void problems on one of the BGA populated on the bottom side of the board. The board have 6 BGAs on the top and 1 on the bottom. No voids were observed during the first reflow (we reflowed bottom side first), but after the second refl
