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LED lifted soldering defect

Electronics Forum | Wed Dec 04 04:28:58 EST 2019 | oxygensmd

It seems there isn't right connection between solder and solder-legs. Maybe check that the LEDs get huminidity, have some oxidation on the legs, try different solder paste, check the reflow solder profile. On the photo I can not saw properly reflowe

pc board defects

Electronics Forum | Sun Sep 15 15:08:00 EDT 2002 | jersbo

My 2 cents... Screen printing may very well have a leg up on deciding SMT defects... however if you pay attention to your stencil (aperture size ratio etc..) and inspect your prints... I believe its a much lesser number... (paste MFG also plays a ro

Re: BGA PAd Soldermask

Electronics Forum | Wed Feb 16 21:51:29 EST 2000 | Dave F

Kurt: Lots of choices, not many of them good, yano. 1 So LPI has taken over the market pretty nearly 100%, but it won't "tent" reliably, because it is not very viscous when applied and drops into the hole. So then, tenting/plugging with LPI is bad

Re: BGA PAd Soldermask

Electronics Forum | Wed Feb 16 21:51:29 EST 2000 | Dave F

Kurt: Lots of choices, not many of them good, yano. 1 So LPI has taken over the market pretty nearly 100%, but it won't "tent" reliably, because it is not very viscous when applied and drops into the hole. So then, tenting/plugging with LPI is bad

Cool technology, minimal applications

Electronics Forum | Thu Mar 11 10:31:57 EST 1999 | Justin Medernach

| NASA CommQuest | | | Photopolymerized Conducting Polymers | | Directions: | 1.Please read the information provided on this technology. You may follow the links to additional information resources below. | | 2.After evaluating the technology,

Sm t net
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