On 27/07/12 03:17, Tom Miller wrote:
I agree with Ron. Clean the board up real good then do an inspection. With a microscope if you can get your hands on one. Look for cracked SMT parts. The high heat from the oven could very well stress the parts causing a failure. Flux the board up and hit all the connections with a small iron. When you melt the solder on each end of a part, if one is broken, it will then show up.
Thanks for the tips.
On further reflection I think that the foam probably has disintegrated over time (mostly). The pattern of what is melted/stuck to components is wrong for an exogenous heat source. I might have to play around with solvents as IPA didn't have much effect on the really stuck down stuff.
I agree it's likely to be a dry joint or cracked SM part so the plan of a thorough clean and visual inspection is a good one - I don't have access to a microscope but do have a couple of decent hand lenses. I suspect careful use of the heat gun and freezer spray will help as well.
I'm going to be away for a week so will pick this up again when I get back. I'll update the list with any progress.
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