Electronics Forum | Thu Jul 31 15:41:23 EDT 2003 | davef
Q: Could any of you guys tell me what exactly is this greenish thing ? A: No, but is not copper oxide. Copper oxide is brown, the color of a penny [here in the US] or an untreated copper laminated trace on a board. Many copper salts are greenish in
Electronics Forum | Thu Oct 29 18:33:18 EDT 2009 | comatose
The top picture probably won't run. You have black soldermask dramatically misregistered and overlapping what look a lot like fids. Either your machines are going to pitch a fit and not find the fid or they're going to center on the soldermask outlin
Electronics Forum | Sun Sep 15 15:08:00 EDT 2002 | jersbo
My 2 cents... Screen printing may very well have a leg up on deciding SMT defects... however if you pay attention to your stencil (aperture size ratio etc..) and inspect your prints... I believe its a much lesser number... (paste MFG also plays a ro
Electronics Forum | Tue Aug 24 15:11:32 EDT 2010 | sjohnson
We are experiencing a high incidence of what we call "black barrel" (to differentiate from black pad) with multiple contract manufacturers and PCB vendors. The PCBs are ENIG and during wave solder (SACX-0307) multiple thru-hole components are seeing
Electronics Forum | Mon Aug 29 08:44:57 EDT 2016 | jrrt_williams
As an OEM repiar tech I would run into "Black Pad" on occasion, though mostly on surface mount pads. The only way I could remove the oxidation was to apply water soluble flux and add solder, then wick away the excess. This left me with a suitable s
Electronics Forum | Mon Aug 22 23:22:29 EDT 2016 | twhoo
i also notice the carbon and oxygen is high on the defect? Why is that?
Electronics Forum | Thu Apr 19 02:49:07 EDT 2007 | ray
I observed some black dot or some oxidation occured on chip termination on pcba reflowed fews weeks ago as buffer stock. The solder joint and fillet wetting is good and shinning. It is an acceptable or defect condition per IPC standard/requirement? W
Electronics Forum | Fri May 23 23:58:48 EDT 2014 | edriansyah
Hi Hege. I was not also too confident with the black pad (coz no black residue on the remaining pad). But based on my search on the internet regarding black pad. Most of them shows a very clean BGA Pad after peel off the BGA as the picture reference
Electronics Forum | Wed Jul 28 20:14:22 EDT 1999 | Dave F
| While inspecting incoming PCBs we detected around all plated-through-holes (only there and all in the same place) some halfmoonshaped light rings that match obviously only with the pink ring symptom shown in the IPC-A-600 chapter 2.5.2.. That would
Electronics Forum | Thu Aug 21 22:10:07 EDT 2003 | adlsmt
Well, for some reason the board house will pay for the boards but has some issue with paying for the parts on them. Why am I not supprised? Perhaps I have mis-diagnosed the problem. We have found two different board p/n's with the same type of defec
