Electronics Forum | Wed Jun 01 15:57:18 EDT 2011 | markhoch
Hi Melanie, Can you provide pictures of the solder connection itself? I've found that xrays can sometimes be misleading.
Electronics Forum | Tue Jun 07 00:10:13 EDT 2011 | Jacki
Hi Melanie The centre pin got solder but not fully as other 2 leads. U better provide the x'sistor from the top view.
Electronics Forum | Thu Jun 09 13:38:16 EDT 2011 | rdubya
You might want to check the components as well, I've seen a similar problem with re-balled parts using the wrong diameter ball. that would also contribute to added solder. good luck
Electronics Forum | Mon Jun 13 01:35:22 EDT 2011 | kenneth0
Had you check the temperature difference of outer balls and inner balls? Solder short in corners might be caused by high delta T causing BGA warping.
Electronics Forum | Thu Jul 21 07:13:15 EDT 2011 | stevezeva
Rain-x being a hydrophobic silicone polymer, aren't you worried that it might cause solderability problems?
Electronics Forum | Thu Jul 21 12:04:01 EDT 2011 | ccouture
the appearance during the application was the same (to the eye). the feel to the touch is the same once it is dry and polished. The effect is the same when water is sprinkled on the treated surface. My understanding is that the product bonds to the s
Electronics Forum | Mon Jun 27 03:40:44 EDT 2011 | samsim
Other areas you can focus 1) Find out alternative chemical and solder materials for lower cost. 2) Set high power consumption machine (such as Oven and wave) to idle mode when not running to cut electrical consumption. 3) Reduce the used of N2 gas.
Electronics Forum | Fri Jun 24 12:32:06 EDT 2011 | ppcbs
You should look at Amtech Solders. They have excellent no-clean fluxes that are designed to be water washable if desired. We have been using them with great results for about 4 years now.
Electronics Forum | Mon Jun 27 21:28:15 EDT 2011 | samsim
It seems to be no solder paste release at certain stencil opening, you may need to enlarge the stencil opening. By the way what is the area ratio for the opening and how is the shape (round/square/diamond)?
Electronics Forum | Thu Jul 07 08:21:27 EDT 2011 | scottp
I don't understand the long lead times comment. You should be able to get stencils next day.
