Electronics Forum | Wed Jun 08 13:49:48 EDT 2011 | sonofptolemy
Hello, I am having a problem with HASL PCB's after it comes back from the stuffer. To me it looks like oxidation and it causes poor wetting. This leads to a bunch of problems all of which have different symptoms but the cause is this oxidation proble
Electronics Forum | Thu Apr 17 05:14:40 EDT 2008 | gregoryyork
I have seen similar things like this before with Solder Resist redepositig back on the pads, this is a clear residue very hard to see. Solder resist will obviously resist solder adhering to it. If you rework the boards then the heat of the iron will
Electronics Forum | Wed Oct 19 22:48:18 EDT 2016 | thaneshsivanadian
Hi All, Currently im seeing a cold solder/ poor wetting underneath the BGA Ball as i shown in the attachment. From the attachment you also can see one ball with poor wetting and another ball with a good wetting. When i checked with my re-flow profil
Electronics Forum | Thu Apr 16 13:47:36 EDT 1998 | Lou
| We are having some difficulty soldering a 240 pin Altera device. We use Alpha WS-609, a very generic profile for that solder paste, and a 6 mil stencil with laser cut apertures (1:1 ratio). This is a 20 mil pitch device (aperture size is 10 mils X
Electronics Forum | Thu Apr 16 13:50:49 EDT 1998 | Lou
| We are having some difficulty soldering a 240 pin Altera device. We use Alpha WS-609, a very generic profile for that solder paste, and a 6 mil stencil with laser cut apertures (1:1 ratio). This is a 20 mil pitch device (aperture size is 10 mils X
Electronics Forum | Fri Jan 14 07:55:07 EST 2000 | Pat Pepper
Hi Wolfgang, Thanks for the response. We had a similar situation to yours with some white tin samples that sat around for about eight months. Samples soldered right after they arrived soldered better than the ones we soldered eight months down the
Electronics Forum | Wed Jun 22 09:12:57 EDT 2005 | bsudak
Our manufacturing site has been struggling with soldering Alloy 42 TSOPs. Currently, we have to hand solder in one of our applications. Here are the particulars. Component: 54 leads, Sn plated, 400microinches +/-200. Process: Eutectic 63/37 Sn/Pb
Electronics Forum | Mon Jun 05 18:50:10 EDT 2017 | caurbach
Hi Zac, My 2 cents: We had similar problems on a board in the same situation (tin-lead HASL, very long leads, low pot height, high pump RPM). Trimming the leads shorter, moving the pot closer to the board, and dropping the pump speed down to sane
Electronics Forum | Sun Jun 14 03:02:14 EDT 2020 | kylehunter
We did a batch of boards with lead free HASL that we thought was leaded. Using standard leaded paste worked, but we did have some wetting issues. The issues were resolved when switching back to leaded HASL. Can't speak to your specific fiducial issu
Electronics Forum | Fri Sep 24 09:49:53 EDT 1999 | C.K.
Hi Folks: We've been having bridging problems on our fine-pitch QFP's, despite thorough inspection of paste height, volume, and placement accuracies....profiles look good also. The bridging is happening after coming out of reflow...one last thing t
