Electronics Forum | Wed Feb 14 15:55:31 EST 2001 | Antonio
Fellas, Here's the deal. We're getting shorts on a limited number of boards under the BGAs; about 1 out of 6 boards. The thing is that these boards have about 10 BGAs on them. On the one out of six boards with shorts, the shorts are everywhere and
Electronics Forum | Thu Feb 15 07:04:59 EST 2001 | CRAIGS
Antonio, one possibility I have seen before on BGA shorts was due to chain slippage on the reflow oven due to worn gearing, the slippage was not severe enough to move other SMT devices but was enough to disturb the molten solder under the BGA
Electronics Forum | Wed Feb 14 21:14:45 EST 2001 | davef
BGA Shorting 1 Damaged mask in between the BGA pad and via on the substrate. 2 Poor print registration. 3 Poor via segregation from the pads? Are they tented or is there just a dam in between? 4 Review the profile. You can run into a number of p
Electronics Forum | Wed Feb 14 16:03:54 EST 2001 | lileubie
Do you have a stencil wipe step after every six boards? If so, the wipe either automatic or manual needs to be optimized. Either less solvent or more time for the solvent to evaporate off.
Electronics Forum | Wed Feb 14 16:45:01 EST 2001 | Antonio
I'm sorry, I should clarify. The average is one out of six boards. It's not consistant as to how many are good before a really bad one. Sometimes two in a row, sometimes ten. Right now we are wiping every 2 boards. Antonio
Electronics Forum | Tue Mar 03 14:07:07 EST 2009 | macisaint
I'm having shorts appear on my QFN packages between pins, usually only after a week or so of power-on operation. The shorts are 1K and slowly down to hard shorts over time. Typically a defective part will have failures on multiple pins. I tried havi
Electronics Forum | Mon Mar 09 07:14:35 EDT 2009 | gregoryyork
wow enig is usually not associated with this failure
Electronics Forum | Tue Sep 04 07:34:02 EDT 2001 | Shvetang Dewashrayee
We have problems of solder shorts while using DEK Infinity printers. Some of the manufacturing lines are configured ina way that the side (bottomside) of PCBs mostly with passive parts is screened first and then the otherside (topside) of the PCBs w
Electronics Forum | Tue Sep 04 09:19:51 EDT 2001 | jhingtgen
Shvetang, From your post it is difficult to say why the shorts are occuring and in what area of the board. I offer my assistance to solving your issue, I am an Applications Eng with DEK USA. Please contact me via e-mail at jhingtgen@dek.com or phon
