Electronics Forum: mid-chip solder balling (Page 4 of 214)

defects in pcb manufacturing

Electronics Forum | Fri Oct 30 10:36:26 EDT 2009 | richie_puthotta

Hi, I see a huge solder mask shift on chip comp pads. This would result in mid-chip solder balls or solder beads. Overall, the solder mask workmanship is not acceptable. Mask is on pad.

Local Fiducials

Electronics Forum | Fri Oct 20 07:03:46 EDT 2006 | sliebl

I really appreciate the input, guys. Having only had the opportunity to run the Contact machines, I was not aware that many of the other machines use coordinates for locals. Now about those damn, mid-chip solder balls.... oh, that's another topic.

Solder Balls-No Clean Paste

Electronics Forum | Thu Aug 19 05:19:31 EDT 2010 | grahamcooper22

I have seen that moisture in pcbs will cause mid chip solder balls. To discount this, take one pcb from a batch that is giving you solder balls and pass it through you reflow oven with no paste or components on (bare pcb)using your normal reflow prof

Re: Mid Chip Solder Balls

Electronics Forum | Sat Jan 15 03:30:25 EST 2000 | Dean

I have reduced solder balling by up to 60 percent by changing the placement height on chip parts. Essentially account for the 6 mills of "Z" height to reduce the "squeezing" effects of the chip impacting the solder bricks. Cheap and easy, especial

Tilted/Slant SMT Component Specs?

Electronics Forum | Thu Mar 28 17:54:57 EST 2002 | slthomas

I realize that this is sort of off-topic, but do you have scads of solder beads (mid-chip solder balls, whatever you like to call them) with that stencil design? If not, would you mind sharing which paste it is that you are using? Email if you like

SAC305 Solder Balling

Electronics Forum | Fri Aug 04 07:44:09 EDT 2006 | aj

Hi, Have you incorporated any Aperture Modifications in your stencil.( i.e. Homebase / 10% reductions). I have a similiar problem here with one of our high volume builds and I am in the process of ordering a new stencil with recommeded aperture red

Lead Free Stencil Design

Electronics Forum | Wed Jul 13 14:56:53 EDT 2005 | jdengler

I read the Cookson/Alpha paper "Optimizing stencil design for Lead-free SMT processing". I interpreted it to mean that if you had a mid chip solder ball (MCSB) problem the "radiused inverted home plate of 20/60/20 style" had the greatest impact on r

Re: Mid Chip Solder Balls

Electronics Forum | Fri Jan 21 10:40:15 EST 2000 | Dave Chapman

Having adjusted the profile speed slower and adjusting the temps to the recommended lower levels, amazingly the mid chips have almost disapeared (90%). It appears they have been trying to run a "1 profile fits all" on the ovens for Alpha 737 and UP78

Pin hole

Electronics Forum | Thu Mar 11 03:03:26 EST 2010 | grahamcooper22

Hi , Looking at your photo....can I also see a hole in the middle of the joint on the chip component ? Maybe its not just a problem with th ejoint son diodes ? Did you also get mid chip solder balls on chips? If so, I'd almost guarantee the pcb has t

Re: Solder Beading under Cap...Need help

Electronics Forum | Wed Feb 16 09:19:22 EST 2000 | MARK ALDER

Please check Circuit Assembly March 1998, article "Solder balls and aperture shapes" and August 1999 "Guiding stencil design". They can be contacted at www.circuitassembly.com The main cause of mid chip solder balls is the volume of paste that is p


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