Electronics Forum | Tue Aug 30 09:49:24 EDT 2011 | blnorman
Guess the better question is why are the resistors and FETs heating to the degree that they discolored the coating? If the coating is discolored, I'd be concerned with the possibility of cracking as dave mentioned. Cracks defeat the purpose of the
Electronics Forum | Thu Aug 20 07:11:25 EDT 2020 | sssamw
What your said looks like a acrylic coating thermal expansion causes small solder joint crack. Do you cure coating with heating, or heating after curing? Solder joint crack while you see resistor and QFN trouble? Clear and detail description of your
Electronics Forum | Wed Jul 29 21:16:17 EDT 2020 | SMTA-64387706
Hi, I have a PCB that works fine when tested before conformal coating with HumiSeal 1B73. It seems like the CC is causing electrical issues. We brush it on, so it is a bit thick. After curing we are getting QFNs that do not seem to connect well and a
Electronics Forum | Fri Jun 25 00:16:11 EDT 2010 | leadthree
I got a report from Yageo yesterday with microsections and and and..... result: Cracks I did a test run on boards after ICT, but before coating. They are all ok. Seems the cracking happens somewhere after the ICT. But at that stage all assembly is a
Electronics Forum | Tue Jun 22 00:20:21 EDT 2010 | leadthree
Pick & Place > Wave-solder > other parts > test > conformal coating Is there any production error that could make a ceramic cap conductive? PS: want to add one point: The caps don't seem to be cracked. We changed a few 100 and didn't notice any bro
Electronics Forum | Fri Jul 04 21:09:04 EDT 2003 | ramanandkini
I have a CEM-1 PCB board with 35 microns copper. This is PCB is finished with SMOBC+HALS. We do solder SMT LEDs, but till date we do not have problems that you have listed. The LEDs are good & bright. It even passed high & low temp cycle tests (-40 t
Electronics Forum | Thu Jun 24 11:21:40 EDT 2010 | floydf
Hi, > > I have a 100nF 0805 ceramic cap (the most > common type!), Yageo brand (20+ pcs. on the > module). In our production run I get some errors > due to conductive caps (can be anything from 25 > Ohm to 5K - most are open of course). Only one
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