11 
2 Using a multimeter to troubleshoot parts
On Answer board we see a lot of machines getting no power at startup caused by an electrical problem often related to the DC IN BOARD, battery charging boards or the logic board. There are many users that buy parts to finally discover that the purchased part was not the culprit. It would be great if there was a page that could specify how to use a multimeter to read the voltage at the DC IN BOARD output (or other parts like inverter sockets, etc), well the most common electrical issues.
In this page you could also give info about the output readings of the problematic electrical parts of the iBook, PowerBook, MacBook, MacBook Pro lines.
I know there are many techs here that could help but often they don't have access to all models.
This page could give the opportunity to Answers contributors to give a more efficient help to the "technically inclined' users to test their parts before a purchase and would bring more new iFixit users via Google so a potential for more sales for iFixit web site.
Is this a good question?
how about having a heading of "my xxxx won't turn on"? this would cover all types of devices, not just select few. a general heading will get more hits? don't know how easy it would be to do though?
by pollytintop
A great idea. I hope someone with the access to the equipment follows through on this. I just wish there was some way of being able to be more certain of logic board problems. I HATE to recommend board replacements because of the cost and my not being able to actually see the problem. That's why I'll frequently recommend getting a second opinion before buying a logic board. + for the question.
by rj713
I always thought that at least some sort of systematic flowsheet should be possible so that one can use it as a resource when fault finding. I do know that Apple does use special diagnostics cable for the iPods that enables the use of a multimeter while the iPod is still closed. Has anyone gone through a stack of service manuals to determine what the similarities for the different models are?
by oldturkey03