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I found this thread which explains some of the issues with mobo component level repair. Not for everyone...http://www.electronicspoint.com/learn-repair-laptop-motherboard-t52148.html
But if you must procede and still want direction, there is this sitehttp://www.laptoptrainingcollege.com/techqblog.html
Note that these are for laptop mobos, there may be other sites for ATX types.