Electronics Forum | Fri Jun 15 11:22:14 EDT 2012 | hegemon
Good info above from davef Solder pot contamination seems likely, are you using any dross reducers or additives that might be reacting with this particluar batch of PWBs? 'hege
Electronics Forum | Mon Oct 12 14:30:58 EDT 2015 | duchoang
Hello Eniac, 1/- Insufficient solder paste, check your print (Printer/Stencil). 2/- If you've got good paste deposit, that could be contaminated pads causing poor solderability. Good luck.
Electronics Forum | Mon Aug 22 22:40:52 EDT 2016 | twhoo
analysis report is as attached. Pls let me know what you think of the root cause of this issue? Can i conclude this is a black pad at thru hole ring with a root cause of contaminated gold
Electronics Forum | Fri Aug 24 12:59:03 EDT 2018 | cupet
Dear davef, but this LED is skip component, that's a blank footprint and one of its pad is badly wetted...this is the reason for my thinking about contamination. Do you mean different solder paste with more aggressive flux?
Electronics Forum | Thu Dec 26 12:41:53 EST 2019 | emeto
We agree with your statements. 1. Having manually printed board will compromise your print and you don't know how much paste you have on each pad. 2. LEDs falling off that easily might be related to contamination, considering that your profile is not
Electronics Forum | Wed Jul 08 02:50:30 EDT 2020 | rsatmech
Hi DucHoang, Thanks for the response. I will share the images. We are using OSP boards and issue is not at particular BGA. Can you suggest me any methods to identify the pad contamination.
Electronics Forum | Wed Aug 18 12:35:41 EDT 1999 | Earl Moon
| | WE ARE CURRENTLY HAVING PROBLEMS REFLOWING BOARDS WITH WHITE TIN PLATING. WE ARE NOT GETTING GOOD WETTING ON THE PADS. | | WE HAVE CHECKED THE REFLOW PROFILE AND TRIED DIFFERENT PASTE'S. | | WE THINK THERE MAY BE CONTAMINATION OR OXIDATION ON THE
Electronics Forum | Thu Jul 20 05:04:30 EDT 2006 | bing007
We had a similar problem with gold contact pads. Cleanliness is paramount. If you are using foil tensioning system, wash the foil in a stencil wash before use as the cardboard cassettes may be contaminated. Be very careful when loading into a frame f
Electronics Forum | Fri May 23 09:27:37 EDT 2014 | emeto
Hello, these pads look so clean.....I am not sure you had a good solder connection there. I would check the following. 1. Is the part RoHS in a lead process 2. X -ray boards after reflow(I assume you will see head in pillow) 3. Check for board con
Electronics Forum | Mon Nov 06 09:38:55 EST 2000 | Dean Stadem
We have seen this problem several times. It always goes back to pad solderability, very seldom does it have anything to do with ball size. If there is no evidence of wetting on that pad, but all of the other pads did solder, you need to ask yourself
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