Electronics Forum | Fri Apr 21 15:31:33 EDT 2023 | jamesatqkits
I had also increased my flux to see if that helped, it did not. 2mm lead length, 5.08 spacing Thank you
Electronics Forum | Fri Apr 21 21:32:06 EDT 2023 | dwl
What kind of fume extraction are you using? If its too high, you could be pulling the nitrogen off of the nozzle.
Electronics Forum | Tue May 02 17:07:12 EDT 2023 | jamesatqkits
I made a nitrogen nozzle from a starfrite silicone funnel and it improved the issue by about 80%. Thanks for the feedback
Electronics Forum | Tue Jul 18 00:24:10 EDT 2023 | stephendo
Those photos also look like delamination. The balls are smaller where the bridging is. There isn't more solder. It's that the solder is somehow squeezed together. Check the BGAs after removing to see if they do have a bulge. Maybe the pcb is flexi
Electronics Forum | Mon Aug 14 05:45:16 EDT 2023 | dimamalin
First, this is the result of bad printer setup. Adjust knife pressure, PCB gap, separation speed, tooling, and stencil cleaning. Pay attention to the coating of contacts pad and height of solder mask of PCB.
Electronics Forum | Mon Aug 14 13:08:00 EDT 2023 | dimamalin
Similar issues arose for me in cases where the contact pads of components were located below the solder mask level. Ordering a thinner stencil might potentially solve the problem.
Electronics Forum | Mon Aug 14 13:21:48 EDT 2023 | calebcsmt
the implication being the soldermask is too thick, raising the top of the board higher than the pads themselves (eliminating gasketing)? Essentially, the board isn't perfectly planar would be the subject of cause it sounds like?
Electronics Forum | Mon Aug 14 13:51:37 EDT 2023 | calebcsmt
I'm actually currently in the process of discussing with stencil MFG regarding the apertures and reduction to see if perhaps it was not optimal for this fine pitch QFN, as just as you mentioned, we have similar products with similar QFNs that do not
Electronics Forum | Mon Aug 14 14:17:19 EDT 2023 | emeto
Now you have to find the root cause, before you continue. Is it PCB design or printer setup? Or both contribute?
Electronics Forum | Wed Aug 23 17:22:39 EDT 2023 | markhoch
I'm curious what you use for PCB Support. Are you using a dedicated support plate or are you using magnetic pins or some type of Grid-Lock system?
