Electronics Forum | Wed Aug 22 21:44:04 EDT 2007 | davef
Questions are: * Do these boards meet IPC-A-600? * What does your supplier say is the source of this color variation? * What steps is your supplier taking to make the boards more acceptable?
Electronics Forum | Fri Sep 21 16:28:11 EDT 2007 | Cmiller
Yea, I remember that. Our customer freaked out but it never caused any problems I am aware of and the boards still have not come back to us. If you are using imersion gold, I would be pretty sure this is the cause.
Electronics Forum | Thu Aug 23 11:24:16 EDT 2007 | hussman
Welcome to Chine. Your best bet is to specify the type of mask you want and the type of finish you need. If not, they run what ever they have available. You may want to contact you board vendor and find out what they can offer. That's what we had
Electronics Forum | Tue Oct 15 11:16:30 EDT 2019 | charliedci
We have been using Cree 3 color LED's (CLV6A-FKB) in many products for several years (pic attached). At the rate of 3 to 5% of the units assembled with this LED, the Red LED fails. After touch up with soldering iron it functions. This happens to the
Electronics Forum | Fri Nov 22 16:19:45 EST 2019 | davef
I'd guess ... + Pads have no solder mask, clear or otherwise. + Pads won't take solder, because you're trying to solder to nickel. + Nickel on the pads is oxidized and is sticking out its tongue at the flux you're using. + Something went south
Electronics Forum | Wed Apr 10 17:05:47 EDT 2019 | davef
I wonder if this discoloration isn't delamination. I'd discuss it with my board fabricator.
Electronics Forum | Fri Jun 07 14:22:51 EDT 2019 | gregoryyork
Would be well worth testing a bare board first
Electronics Forum | Fri Jun 07 11:17:14 EDT 2019 | teejsd
Unfortunately for me, I can't say whether those balls were flat on 1 side or not -- sent this board for x-section to see if we had CAF, since my ionics testing wasn't breaking IPC standard. Unhappily my x-sect results were inconclusive. However I d
Electronics Forum | Fri Jun 07 12:34:30 EDT 2019 | teejsd
C3 just uses heated DI water that it applies, then pulls back into a disposable cartridge. Machine then applies a 10V charge to the sample & measures leakage current(nA,I think) over time(sec). If the leakage current is high enough/fast enough, you
Electronics Forum | Fri Jun 07 14:14:24 EDT 2019 | teejsd
Yes neither our HPLC IC nor our C3 could detect any concerning levels of ionics. Soaking over a weekend sounds like a good idea, though I may still need to cut the board down to fit our Kapak bag size. And get our silicone coating off the surface. K
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