Electronics Forum | Fri Jan 15 17:13:07 EST 1999 | Earl Moon
| | | | Hello, | | | | | | | | We are qualifying new sources of PWB vendors. We've got the first lot of "produciton" boards in and we want to put them through the paces before turing the vendors on. | | | | | | | | So far, the tests I can think of
Electronics Forum | Thu Dec 24 13:43:30 EST 1998 | Earl Moon
| | | Anyone ever attach gold bump flip chip to FR4 or Alumina substrates. Am trying to find a solder which is acceptable for use on gold. Am worried about gold imbrittlement since the gold bumps on the flip chip are .004"x.004"x.001" solid gold. T
Electronics Forum | Thu Nov 19 11:06:40 EST 1998 | Earl Moon
| We have some PCB�s in our warehouse in Manaus - Brazil. They are stored for more than 2 years , in a condition of 25 degrees centigrades and a humidity ranging from 60% to 90%. | Do these conditions cause the PCB�s to deteriorate over time? If so ,
Electronics Forum | Wed Jun 24 16:23:29 EDT 1998 | Justin Medernach
| Has anyone had experience with placing BGA on gold plated boards. I thought I read a while ago there was a problem with embrittlment causing cracked joints. If anyone has experience with this your feedback would be great. | Mike Mike, Your concer
Electronics Forum | Thu Aug 29 06:48:01 EDT 2002 | yngwie
I have seen several Imm Ag pad on the assembled board which have a copper colorleaching through the silver plating This happened on the pad which was not deposited with paste during the assembly process. Don't know if it is a problem, but we only
Electronics Forum | Mon Mar 04 17:52:59 EST 2002 | davef
Yes, providing the surface of the via is solderable. * If so, how much paste? => Vias come in various sizes. Boards vary in thickness. So, the amount of paste to fill a via varies. Roughly, you�ll need twice as much paste as the volume of the via
Electronics Forum | Wed Oct 02 20:59:23 EDT 2002 | davef
We�ve been stewing on this and it just dawned on us the part that�s missing. Blow-holing is caused by BOTH of the following: * Moisture absorption by the resin that holds the board together. [Steve is addressing this with his various baking schemes
Electronics Forum | Tue Dec 17 16:27:02 EST 2002 | davef
I�m not clear on the problem. What I get: * Your fabricator did not deliver the product that you asked for in your purchase order. * Pad. Land. A portion of a conductive pattern used as a termination area. Metal surrounding a hole on a printed ci
Electronics Forum | Thu Jun 12 18:39:07 EDT 2003 | MikeF
Hexacon sells the LevChek, it is a special tempered glass plate for checking a wave solder machine. They make different sizes, so you can get one that is close to the maximum width of your wave. They also have grid lines etched on them so you watch i
Electronics Forum | Wed Jul 21 13:18:19 EDT 2004 | patrickbruneel
Thomas, The first thing I would suggest you to do is identify the type of problem your dealing with �pinhole� or �blowhole� before you can take the appropriate action to correct the problem. A pinhole is a void or cavity caused by non-wettable part
