Electronics Forum | Fri Oct 20 10:15:13 EDT 2006 | wrongway
mid chip solder balls we had that trouble for awhile we went from a 8 mil thick stencil to 6 mil stencil and did some home plate style of cut outs in the stencil for the 1206 caps and resistors it seemed to fix our mid chip solder balls
Electronics Forum | Wed Jul 25 11:55:21 EDT 2007 | ck_the_flip
Zoinks!! Doing the homeplate design on 0402 will actually make your tombstones WORSE! Think about it. Your wetting forces are now on the ENDS of the device with no solder paste toward the middle of the device to tack the part down - a gauranteed f
Electronics Forum | Fri Mar 25 04:28:54 EDT 2011 | grahamcooper22
Are the solder balls what we would call ' mid chip ' solder balls where a single or sometimes a few larger solder balls are positioned somewhere along the side of the chip or are they the solder paste powder particles spread around the pads ?
Electronics Forum | Tue Aug 17 11:24:04 EDT 2010 | namruht
I have a question that has been discussed many times, but is always good to get some new insight. We have lots of issues with our no clean process. We use a Kester EP256 solder paste. I would just like to get some general tips on how to get rid of mi
Electronics Forum | Tue Aug 17 13:36:17 EDT 2010 | hegemon
Since you have home plated the apts and done solder reduction, I would take a look at your soldering profile. We have run into this before when running no-clean and found that reducing the initial ramp rate to the flux activation was a help in the
Electronics Forum | Thu Jul 17 15:12:18 EDT 2008 | slthomas
To quote a regular here, "Are you sure your washer is set up correctly?" :P He's a WS junkie. This is a really common problem and is discussed here often. Mid chip solder balls (solder beads) are almost always the result of too much paste being dep
Electronics Forum | Fri Jan 14 16:21:42 EST 2000 | Dave Chapman
We are having mid chip solder balls on chips and resistors. Seeing the problem on 80% of the assemblies we run. Anywhere from 1 to six of the balls per board. We have slowed the oven down, increased the pressure on the screenprinter to get less paste
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.
Electronics Forum | Mon Jan 17 10:55:44 EST 2000 | Dave F
Interesting point Mark. We prefer solder mask between pads to reduce bridging. How does removing solder mask between pads eliminate solder balling? Thanks Dave F
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.
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