Electronics Forum | Mon Apr 14 14:11:30 EDT 2008 | cyber_wolf
I dont know if this is related, but there appears to be a blister/measle in the upper right corner of the Q19 large pad. (upper right of Q19 as you are facing the photo) If your profile and paste is good, my bet would be that there is something wron
Electronics Forum | Thu Apr 17 10:44:24 EDT 2008 | rculpepp
I'd suspect contamination also, possibly from the board supplier. Sr. Tech's post mentioned what looks like a blister on the board, in the upper right of the Q19 photo. This could very well be a contaminate from the PWB fab shop. I've seen similar pr
Electronics Forum | Fri Jan 20 13:25:07 EST 2006 | Gary Kemp
The mask/copper layer is exhibiting popcorn blistering following reflow. With profiling we know that the assembly does not see anything close to 250 C, rather around 238 C.
Electronics Forum | Sun Sep 13 19:56:21 EDT 2009 | 89jeong
Hi All I have a pig problem after reflow. It is a blister in hole.It happend after reflow(Lead free solder) I touched the blister with tweezer. The plating was lifted off easily How do i do? What is a root casue? Drilling or plating? Is it possible
Electronics Forum | Thu Jul 09 11:20:24 EDT 1998 | Justin Medernach
| I am looking for a little enlightement with an issue that we have been seeing. We have printed curcuit board with multilayer and HAL finished. | After reflow soldering, we have often "blister phenomenon". | Our reflow profile is normal. Factory
Electronics Forum | Wed Jul 08 20:57:11 EDT 1998 | hyeon-jin Kim
I am looking for a little enlightement with an issue that we have been seeing. We have printed curcuit board with multilayer and HAL finished. After reflow soldering, we have often "blister phenomenon". Our reflow profile is normal. Factory conditio
Electronics Forum | Thu Feb 15 21:09:45 EST 2007 | Stephen- SMT engineer trainee
1. Can anyone tell me about the water absorption(wt%) among different PCB((i) RoHS, (ii)non-RoHS, (iii) Halogen free)), I am currently facing the problems of PCB blisters after reflow process. 2. Also, please suggest the baking period/time among dif
Electronics Forum | Tue Jul 18 18:53:23 EDT 2006 | Mike F
Is it showing up after wave or reflow soldering, or after hand soldering? If the delamination or blister bridges between traces you have the potential for a short circuit between those traces. A delamination might be repairable, but in most cases i
Electronics Forum | Sun Oct 10 18:53:04 EDT 1999 | Dreamsniper
| | | | Is there an IPC Standard stating the max. number of times that a PCB can pass through a reflow or wavesolder machine without having solder mask breakdown. | | | | | | | | PCB is FR4 | | | | Solder Mask is LPI | | | | Reflow and W/S Profile =
Electronics Forum | Fri Jul 28 08:34:47 EDT 2006 | Chunks
What does your reflow profile look like?
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