Electronics Forum | Thu Aug 24 11:29:24 EDT 2006 | ericg
I would much rather go with new, but the price seemed to be high for management. I'm thinking up to 20K. I have seen new machines for this price but I�m not sure if they have the quality I am looking for.
Electronics Forum | Fri Aug 25 07:42:29 EDT 2006 | davef
Our sympathies about the ENIG boards. B:) So, you cut the end off the barrier bag, take 200 boards, heat seal the end of the bag and restock it, build the 200 boards and ship them, right?
Electronics Forum | Mon Aug 28 07:28:07 EDT 2006 | davef
Mr Jarvis One experience with black pad makes you promise never to use ENIG again. It's nice that you have a supplier that has avoided that problem.
Electronics Forum | Thu Aug 24 09:48:56 EDT 2006 | saaitk
We tend to screen paste to the BGA ball. This is quite effective although the repeatability of screening is not always great. Does anyone else use this method and how or have you managed to overcome this repeatability issue.
Electronics Forum | Thu Aug 24 10:34:05 EDT 2006 | Loco
We use tacky flux, we just make sure the left over solder on the board is really flat, it kinda replaces paste, although there's probably less solder left then there would be paste.
Electronics Forum | Thu Aug 24 12:09:35 EDT 2006 | Chunks
Now how did you know we were wave soldering BGAs onto a board that goes into a karaoke machine? Thanks for everyone's input. We currently use tacky flux, but I beleieve we will also look into screening paste onto the BGA as well.
Electronics Forum | Fri Aug 25 11:29:40 EDT 2006 | SWAG
I've used those kapton, stick-on "stencils" a few times. Worked well for us. Toughest part is getting the kapton pattern in the correct place. Adding paste and placing the part is easy.
Electronics Forum | Fri Aug 25 12:53:58 EDT 2006 | CL
We use "tacky flux" for most BGA replacements. We have found that we sometimes need a microstencil for paste on Micro BGA's. CL
Electronics Forum | Fri Aug 25 09:25:41 EDT 2006 | YQ Deng
For FR4 ENIG PCB: 1. In a normal condition, what is the broken location after BGA peeled off?(FR4 layer or Ni layer or solder ball) 2. What is the soldering acceptance criteria for BGA in CMK?
Electronics Forum | Wed Aug 30 21:59:47 EDT 2006 | YQ Deng
Dear Davef, Sorry for late reply! CMK is a PCB supplier, BGA solder defect were found in CMK PCB. is there other method to verify the BGA soler criteria, such as reliability test?
