Electronics Forum | Wed Jul 16 10:56:35 EDT 2008 | arminski
Armynski, > > You should do a Cpk study to > baseline how capable your ovens are. Then based > on Cpk, determine the frequency. nice input!
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 Jul 28 11:31:42 EDT 2008 | blnorman
Ideal situation is get a technical rep from the solder paste supplier. They know their paste better, and should be able to work out a profile based on their paste and your oven. Again, a technical rep, not the sales guy.
Electronics Forum | Mon Jul 28 13:21:50 EDT 2008 | realchunks
Do you have a Slim-Kic? You can run a profile and then do predictions from there. Very useful tool.
Electronics Forum | Tue Jul 29 10:53:58 EDT 2008 | pcbbuilders
Some profiles can be difficult to get exactly, so I was wondering what effect a slight deviation might have.
Electronics Forum | Tue Aug 05 02:02:51 EDT 2008 | lococost
Have you tried the alcohol based flux on your ive yet? (even if it isn't specd for leadfree). Water based flux seems more prone to solderballing. edit: why is sel ective changed to ive and alte rnative changed to native?? censorship for innovation
Electronics Forum | Fri Aug 08 14:39:26 EDT 2008 | dmiller
I would have to second the opinion on the water based flux. If you don't want to deal with the solder balls, switch to an alcohol based flux. Unless you have a board that takes a while (water based tends to stay active longer), alcohol is easier to
Electronics Forum | Mon Aug 11 02:00:04 EDT 2008 | chrispy1963
GR@ICS, I copied and pasted all of the thread here including the photos and sent them to our programmer for the machine. I will get back to you if he doesnt come on here himself and respond to your problem. Hopefully we will have an answer for you
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.
Electronics Forum | Wed Aug 20 12:04:06 EDT 2008 | grics
I would like to thank everyone for their help on this one...We havent had the board back at S E L E C TIVE on this yet, But I will keep all updated (if there is the care for it... Thanks again
