At 08:27 PM 12/30/2010, Old Volks Home wrote: >my way with no further problems. I've never opened a Bosch or TA ECU, >so perhaps they are due for inspection sometime soon. Just be aware most of the solder failures I've seen will not be visible without a microscope. By the time they get really really bad they will, but they may very well have failed electrically - either an intermittent or a hard failure - before then. See http://picasaweb.google.com/dbeierl/SolderFatigue# I got into this stuff through an industry-magazine article around 1980 with some fascinating photomicrographs, much better than what I have to show. Then had some further experience later at a VDT builder where we had some problems with thermal cycling on a video drive transistor. Yours, d |
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