Electronics Forum | Fri Jul 13 04:58:01 EDT 2007 | pavel_murtishev
Good afternoon, Heating/Cooling rates contribute to warpage most of all. Try to tweak you profile so that heating/cooling rate would be minimized. Try to switch cooling blowers off maintaining required peak/TAL. Check copper balance for this PWB, by
Electronics Forum | Tue Jan 15 18:47:14 EST 2008 | operator
Funny you mention this. I tried this first. I have one now I am trying to sell for $87 dollars on EBAY. I am sure it could be useful for something other than electronics inspection. For electronics inspection of completed circuit boards it BLOWS!
Electronics Forum | Wed May 14 09:40:55 EDT 2008 | realchunks
Try running the second side first on a board. If it wets well, it points towards your board house. Run a blank board thru your oven and then try your normal process. If you see issues with the first side now - it definitely points towards your boa
Electronics Forum | Fri Jul 25 07:26:45 EDT 2008 | realchunks
From what I can understand, you say this only happens on one type of BGA (?). Try baking this BGA. You may have out gassing during rework. Do you use tacky flux during rework? If so, try a different flux. And last, check your rework profile.
Electronics Forum | Mon Aug 11 10:48:06 EDT 2008 | realchunks
Too much flux will spatter and can leave balls on either side. From your pix you may too little flux. Try turning up and see. Also try hand applying your alcohol based flux and running through. Will take away a few question marks.