Electronics Forum | Mon Jul 10 08:17:06 EDT 2017 | philc
Just a random thought, but we had an issue with having to replace faulty LED's on a PCB, and the solution turned out to be pre-baking the LED's prior to build. Just put them in an oven at 40C for 24 hours, then build. Result was zero defective LED's.
Electronics Forum | Thu Jun 29 04:50:42 EDT 2023 | SMTA-70263692
This looks like it could be related to oxidation.Do you per-bake your pcb before assembly to remove any moisture inside your board panel?
Electronics Forum | Thu Sep 14 14:18:13 EDT 2006 | Kevin W. Parker
We have begun using a PCB with Organic Surface Protectant. We normally run boards with non orgainic protectant. We can wash these boards with our ultrasonic cleaner using Zestron SC202 and a separate Hot/cold rinse system with an air knife. This r
Electronics Forum | Wed Nov 21 15:02:46 EST 2007 | jlawson
From info I have been told from design standpoint, via in pads helps with managing EMC issues with working design, in particular for high speed digital/dense populated type PCB's. We had a manufacturing customer that had very low yield because of th
Electronics Forum | Fri Feb 05 11:50:54 EST 2010 | baildl632
I just browsed this article and found no mention of cleaning with a "sonic" washer. We have a PMR Systems Ultrasonic Stencil Cleaner. The manual says it works well on cleaning PCB's for varoius reasons. It works excellent for removing lead. We can wa
Electronics Forum | Thu Feb 15 21:09:45 EST 2007 | Stephen- SMT engineer trainee
1. Can anyone tell me about the water absorption(wt%) among different PCB((i) RoHS, (ii)non-RoHS, (iii) Halogen free)), I am currently facing the problems of PCB blisters after reflow process. 2. Also, please suggest the baking period/time among dif
Electronics Forum | Thu May 31 22:35:23 EDT 2012 | jacktan
I have encountered PCB delam issue with high density PCB. PCB has 42 layers , 5 mm thickness ,laminate material is NelcoN4000-13EP,Tg 210C and Td 350C. Have pre-bake at 125 c for 12 hrs before assy.My reflow temp is standard with 243 peak and TAL is
Electronics Forum | Tue Aug 12 19:18:34 EDT 2008 | arminski
Hi davef, couple of questions: clarifying costing of direct labor against overhead cost: an operator loading PCB onto the reflow oven is a direct cost, how about the reflow process time of the PCB while travelling inside the reflow, is that an ove
Electronics Forum | Tue Jul 20 16:55:21 EDT 2004 | vwhipple@sono-tek.com
Pin Holes can be caused by many things. Does the problem come and go?? If so, see if there is a correlation to lot numbers on the boards or vendor. This could indicate a supplier issue.. possibly with the mask. Look at your soldered assemblies und
Electronics Forum | Wed Jun 12 13:27:28 EDT 2013 | joeherz
Our customer wants to do an overmold operation (3rd party to us) on the non-populated side of a rigid flex assembly. Their inquiry below: "We are going to end up over molding plastic over the back of this rigid flex to form an enclosure but wanted
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