Electronics Forum | Thu Aug 21 14:47:09 EDT 2008 | linny999
Hello, My Flextek bare board loader has a PLC fault. The fault light is repeatedly flashing. I have had no response from Flexlink (who bought flextek) after 3 phone calls to them. The PLC is an AB Micrologix 1000 Can anyone point me in the right dire
Electronics Forum | Fri Aug 22 00:20:29 EDT 2008 | rameshr
Hai, In our process we are using the micro bga of size 13X13mm of pitch 0.45mm,after soldering process the bga found collapsed, we absorbed that the PCB land pattern of the BGA was not in array, uneven distribution of pads (area) & most of the pads
Electronics Forum | Fri Aug 22 02:40:31 EDT 2008 | kelson
Hi All, I have question regarding the PCB. My PCB is immersion silver furnished. I found out that the board is darkening from immersion silver to yellownish colour after exposed to the environment. From my finding, i think it may be caused by the su
Electronics Forum | Fri Aug 22 10:01:52 EDT 2008 | robinj
I have seen this problem before. If the color is yellow usually it is caused by moisture left on the boards from poor drying after immersion silver. One of the ways to get rid of this is by dipping in acid cleaner solution. If the board supplier uses
Electronics Forum | Wed Aug 27 00:21:53 EDT 2008 | kelson
Logan, My boards have gone through the baking process. After that, we ran through reflow of bottom side and washing. Due to inadequate parts, then we have on hold the reflow of top side. We kept the boards in a room. After 1 week, we noticed there w
Electronics Forum | Thu Aug 28 04:07:46 EDT 2008 | kelson
Hi robinj As you have mentioned, if the color is yellow usually it is caused by moisture left on the boards from poor drying after immersion silver. However, our boards were received from the supplier and the changes happened in our side. So, what di
Electronics Forum | Wed Sep 03 11:42:21 EDT 2008 | robinj
If the tarnish is really dark, it is very difficult to remove. Since it is yellowish it is only in the early stages. Replating will definitely work. I have used sulfuric acid based cleaners to remove this yellowish color. But rinse well and dry quick
Electronics Forum | Mon Aug 25 06:43:37 EDT 2008 | callckq
Dear All, Recently, we found a strange defect called "Head-in-pillow" defect at CPU socket BGA. The strange thing here is that this problem only appear on that CPU socket BGA and not on the others BGA which were also mounted on the PCB. We suspect
Electronics Forum | Tue Aug 26 09:33:04 EDT 2008 | wavemasterlarry
If this board is waved soldered than you may want to look at the wave causing the BGA to reflow a 2nd time when it goes over the wave. The board bows down and the the joint liquidfies and then hardens before the board fully goes back to flat which c
Electronics Forum | Mon Aug 25 08:37:50 EDT 2008 | pcbbuilders
I am looking for an inexpensive way to bake just a few components. would a toaster oven be okay on the low setting (i would get a thermometer!) do i need to get something to place the components on? maybe a silicon cooking mat (not sure about the ESD