Electronics Forum | Fri Jul 30 09:43:44 EDT 1999 | C.K.
| We are having a process related problem with pullup resistors on a controller card which has a I960 micro-processor. | The controller monitors signal inputs and it's own resources then blinks a LED to indicate its working. The problem is that after
Electronics Forum | Wed May 21 09:31:09 EDT 2003 | caldon
I need to first understand what "Peeled the BGA off" means. Was heat used? was this the pry and lift method? We had shorts under some BGA's we have and the solder was bridging from lead to lead but not on the board level at the FR4 on the BGA creati
Electronics Forum | Fri Sep 12 22:57:13 EDT 2003 | Dean
What is the surface finish of the PCB? Tin? Imersion Silver? What flux is used in wave solder and / or SMT? I have much experience with silver migration and tin wiskers. Both can disappear during a reqork cycle. Both can be extremely difficult
Electronics Forum | Tue Dec 31 02:04:19 EST 2019 | sssamw
From the picture, I cannot see clearly solder ball violate electrical clearance or cause a short, maybe it is. What I can see is the solder paste has some misalignment although it doesn't printed in solder mask area, but actual position will reduce
Electronics Forum | Fri Dec 11 09:51:56 EST 2009 | dyoungquist
I won't say never but very rarely do we have problems with the flux seperating. The way we get around the 1-2 hour warmup time is this: The day before we run a particular job, the last person takes out the paste needed from the fridge as the last t
Electronics Forum | Thu Jul 28 07:23:24 EDT 2011 | scottp
My group supports a couple hundred lines all over the world. Most of them use squeegees but a few use either the MPM Rheometric pump heads or the DEK Proflow heads. I absolutely hate the enclosed heads. Flux separation, compaction, and the print q
Electronics Forum | Mon Dec 17 10:46:04 EST 2007 | realchunks
First of all, more info is needed. Solder shorts can be caused by much more than flux. Is the solder short always in the same spot or all over the place? More detail please.
Electronics Forum | Thu Jan 18 08:37:10 EST 2007 | CL,
"solder tends to pool on the short side of the substrate" Does the short side of the substrate have any significant difference in thermal mass? if so, try slowing the belt (within reason) or increasing temps (within reason) to better equalize therma
Electronics Forum | Sat Nov 07 14:05:43 EST 2009 | doremi
Hi, I have 4 years as an AOI Process Engineer and we are working with 3 types of AOI - Marantz 22X, VI3000 and Omron (RNS & VT-WIN2). For solder joint inspection (solder meniscus quality, insufficient solder, wetting problems, shorts (bridges) Omron
Electronics Forum | Wed Jan 17 18:42:49 EST 2007 | Richard
I'm trying to get an even solder coating onto a retangular shaped ceramic substrate (5.0mm x1.83mm), but the solder tends to pool on the short side of the substrate.