Electronics Forum | Thu Aug 28 11:13:53 EDT 2008 | janz
Have you tried to run the same process but with diffrent solder paste manufacturer.? This give you information whether paste is ok. Try also print paste on the bare board and run through reflow oven. Check 2-3 boards. Is it the same places where i
Electronics Forum | Mon Oct 20 07:29:17 EDT 2008 | hussman
I assume you mean soldered and not welded. If the one pad that is having problems has a via hole next to it, it probably has more copper around it. Try running a hotter profile.
Electronics Forum | Fri Aug 29 14:52:06 EDT 2008 | wavemasterlarry
and put a few bucks in your pocket for free.
Electronics Forum | Wed Sep 03 20:10:18 EDT 2008 | vladig
Nope. I'd be happy to do the analysis for free just to prove the point. Regards, Vlad
Electronics Forum | Wed Nov 07 09:19:16 EST 2007 | pjc
Could be not enough peak temp. Do you have a profiler? I'd measure at the BGA joints- drill under board to get access to BGA solder joints and embed a couple of thermocouples with hi-temp solder, then run your profile to see max. temps. and that prof
Electronics Forum | Mon Aug 25 15:40:58 EDT 2008 | dyoungquist
I am seeing poor quality solder joints, mostly on 0402 components. The problem is that while the pad on the pcb is getting fully wetted, the solder is not flowing up the sides of the 0402 component, i.e. the 0402 lead is somewhat de-wetting. The re
Electronics Forum | Fri Aug 29 10:37:44 EDT 2008 | gdzuber
Very interesting problem because it shows how systemic this kind of problem can be. So many variables, right? Firstly, discussions here are similar to everyone's postings, but there are some different observations. The manufacturer��s profile, we t
Electronics Forum | Wed Aug 27 14:38:20 EDT 2008 | rgduval
Does your paste provider recommend a TAL? For the leaded and lead-free pastes that we use, the manufacturer recommends 60 seconds above liquidous. I note that your profile shows the TAL as 30 seconds, which may not be sufficient. That said, tho
Electronics Forum | Tue Jan 13 07:44:48 EST 2004 | Chris Cottreau
Upon inspection were seeing most if not all of these SOT 23 are not reflowed properly. The components just sit on top of the solder, this is creating insufficients, poor wetting, etc. There are about 25 SOTS per board, 2 boards per panel creating alo
Electronics Forum | Tue Jan 13 10:25:29 EST 2004 | James
Do you have a different reel of parts. The leads could be oxidized from age. If everything else is soldering well, I would try that. Is your profile on your oven correct?
