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Message: <blockquote data-quote="Raz0rEdge" data-source="post: 1514310" data-attributes="member: 110816">To truly debug at the hardware level (first a multimeter is definitely not enough), you need access to the schematics to be able to trace through the connections to where things are coming and going. You need to figure out where all the power rails are and if they are powering up. You need to go through all the caps, resistors and ensure that they are all working. Finally, you need to go through all of the components and ensure that they are operating properly with some output that can actually be monitored..None of these things can be done by just looking at the the logicboard. The nature of liquid and electronics is that you never know what part has failed and is causing problems. Sometimes, if you're lucky, you will get a clear indication of a burned out or blown of cap/resistor that can be potentially replaced to get going. However, a lot of components are soldered on by machines and not by hand and if they fail, they may fail without any physical indication and even if you were to determine the failed part, getting the replacement and doing the replacement isn't possible with just a soldering iron..So believe me when I say that we are not discouraging you from finding the problem that is ailing the logic board, but are just telling you that as a lay person without the necessary Apple-level information it's hard to know where to start..</blockquote>