Electronics Forum | Thu Jun 09 14:45:21 EDT 2011 | kahrpr
Does the board look like that before Reflow?
Electronics Forum | Fri Jun 17 13:51:21 EDT 2011 | mosborne1
Your problem is at your board house with the finish. There is not enough tin deposited on the ground plane. Could be the current density too low on the ground plane. If electroless they just didn't process these correctly. What is the finish suppose
Electronics Forum | Thu Jun 16 17:02:40 EDT 2011 | boardhouse
The finish looks like Immersion Tin or Silver. if its lead free Hot air - could be issue of to high of a Tin Content. find out what brand of Hasl they are using. SL100 Example. Is this tarnished look only being seen after assembly or have you seen
Electronics Forum | Wed Jun 08 13:49:48 EDT 2011 | sonofptolemy
Hello, I am having a problem with HASL PCB's after it comes back from the stuffer. To me it looks like oxidation and it causes poor wetting. This leads to a bunch of problems all of which have different symptoms but the cause is this oxidation proble
Electronics Forum | Thu Oct 23 23:38:48 EDT 2008 | pathakvj
We have 8 layer HASL PCB. We saw molten solder blobs / balls on op side of assembled PCB. (to check, if this was a bare board problem), We passed bare board as received thru, SMT reflow oven and saw solder balls on top side of board. What could be th
Electronics Forum | Mon Oct 27 14:15:47 EDT 2008 | hussman
So you passed a BARE board thru the oven and got solder balls?
Electronics Forum | Mon Oct 27 14:28:19 EDT 2008 | patrickbruneel
Do you refer to the highlight in the picture as a solderball? Looks more like copper to me.
Electronics Forum | Thu Oct 30 19:59:05 EDT 2008 | gregoryyork
solder ball was caused by hasl process not reflow. seen before many times, look around wells of smt on bare boards should be more of them
Electronics Forum | Fri Oct 24 06:55:48 EDT 2008 | clampron
Good Morning WS, If you experieced the solder balls after reflow of a bare board through the oven, then the source of the solder is either the oven or the board. I have had boards with untented via's that were HASL'd that had entrapped solder and fl
Electronics Forum | Tue Nov 04 12:58:17 EST 2008 | smt123
I have to agree with Patrick here. This image appears to show a board that is NOT HASL as there is what appears to be a copper pad in the upper portion of the image. But then again the arrow tip appears to be white and I woudl expect that to be red s
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