Electronics Forum | Sat Oct 06 05:33:47 EDT 2001 | spchua
I had recently encounter the "black and grey" pads problems for the BGA pad after the convection re-flow. The pads shows in in "black and grey" color and a litter solder in it, and it happen in ramdom, when applied heat and solder on the "black and g
Electronics Forum | Sat Oct 06 08:42:21 EDT 2001 | davef
Please give us additional background on your board, solder, process, etc. If you are talking about black pad in ENIG solderability preservative, check the fine SMTnet archives to get started.
Electronics Forum | Fri Jun 08 17:22:51 EDT 2007 | naynayno
We have been producing an IMS assembly with SMT dpak's for some time. However, we recently encountered a new problem by chance - the parts can be flicked off with a finger nail. I state by chance because the solder joints are wetted and shiny with
Electronics Forum | Fri Jun 08 18:27:03 EDT 2007 | jmelson
This is probably an inner plated layer of the component that did not bond well. It may be a component that either has the wrong surface finish for lead-free or can't handle the temperatures. Many times I have seen a similar-looking layer when the l
Electronics Forum | Fri Dec 27 16:12:54 EST 2019 | anteiv
thank you for reply here is picture of the board https://imgur.com/a/i2MfFBw on the bottom are pins/components which height is about 3-4 mm from bottom of the board we had to increase distance of board from nozzle to make clearance and we increas
Electronics Forum | Fri Dec 27 12:42:36 EST 2019 | rgduval
In your video, it looks to me as though the bottom of the glass is too low, but, I can't tell for certain. As a general rule, keep the top of the wave no higher than the mid-point of the PCB. Top flow will take care of itself thanks to flux and cap
Electronics Forum | Sat Jul 19 12:22:55 EDT 2008 | operator
Are there any softwares OR functions inside of the softwares that allow a designer that is creating a very large complicated wiring diagram with say....many terminal blocks and connectors etc... to run a point to point check on his drawing? Bascially
Electronics Forum | Sat Jun 25 15:20:03 EDT 2016 | skipper6567
I have a mini/micro transformer that is mounted on a pcb inside my lowrance gps/plotter. I have removed it from the pcb. It has 5 through hole pins, 3 pins out bottom one side and 2 pins out bottom on opposite side. The transformer has yellow tape ar
Electronics Forum | Wed Sep 14 02:41:49 EDT 2016 | bukas
here is well explained SMEMA interface http://www.daghee.com/?p=326 so, disconnect printer from upline modules and check are any 2 of 4 pins shortened(should be pins No 1 & 2) while machine is ready state. when machine is in busy state the same pin
Electronics Forum | Fri Aug 26 09:57:21 EDT 2005 | russ
The Immersion gold is not a problem with BGAs specifically but "black pad" which can be present anywhere. The unfortunate thing with BGAs is you cannot see it. Personally I hate white tin. It is okay for single sided boards running no-clean, but c
