Electronics Forum | Wed Aug 24 21:57:45 EDT 2005 | adeline_ko
The blistering is around the plugging via. I can forward you the pic. For the plugging process, I'm not too sure how they plug. What is the correct practise for the plugging via. Now, what they did is. They will do a tenting process for both side.
Electronics Forum | Sat Aug 27 09:47:05 EDT 2005 | davef
From the pic, we see blistering, but none so close to via that we'd attribute the blistering to via, via plugging, or anything of the sort. When we see blisters like this, we think of a surface contaminant being present on the boards at the time of
Electronics Forum | Tue Aug 23 14:23:00 EDT 2005 | pjc
Most ovens I know use oil to lubricate conveyor chain, not grease. Anyway, is this what you're using: NMG No Melt Grease NLGI 2 (operates from -20�C to +270�C) NMG is a long-fibred highly adhesive grease which does not melt or drip at high temperat
Electronics Forum | Tue Aug 23 14:25:50 EDT 2005 | pjc
Here's the oil: BIO 30 - Biral Industrial oil (operates to +300�C ) BIO 30 is an extremely high quality synthetic industrial oil for a wide number of applications. BIO 30 leaves no carbon deposits and is highly resistant to oxidation. An outstandin
Electronics Forum | Thu Aug 25 13:06:45 EDT 2005 | carln
I evaluated a couple of the Vigon products by Zestron last year and I think the SC200 was one of them. They seemed to clean OK, and Zestron said they were biodegradable, but they conveniently failed to disclose that they contained VOCs. If you are
Electronics Forum | Wed Aug 24 08:46:10 EDT 2005 | aj
James, I understand that you would like a quick fix answer but profiles take time and analysis to get right. Firstly, your paste supplier should provide an example of the correct profile for the paste you are using. Secondly, what makes you think
Electronics Forum | Wed Aug 24 11:34:03 EDT 2005 | dougs
if you don't scrap a board you'll struggle to get this right, i've seen it in other places i've worked where the management wouldn't let me scrap boards to test the profile and also wouldn't let us charge customers NRE for the cost of a board, needle
Electronics Forum | Wed Aug 24 12:25:52 EDT 2005 | bman
We've been down this road before, and it doesn't have to be as expensive as it would seem. First, ask your board supplier for a solder sample of the board. They are likely to have a scrap board that you can use for your profiling. As for the BGA(s
Electronics Forum | Thu Aug 25 09:56:08 EDT 2005 | james
I ran a profile on a dummy board with no parts and the peak temp is 220. The 220 is just the temperature of the board of course. With that BGA on it, I am pretty sure it sucks up alot of the heat. Also I am looking at the profile and notice that i
Electronics Forum | Thu Aug 25 10:07:02 EDT 2005 | Rob
From reading back through the post, it looks like you still need to establish whether the parts are actually being damaged, or just not soldered properly. If you're worried about heat damage get the manufacturers recommended reflow profile and che
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