6 Replies Latest reply: Jun 7, 2012 7:31 PM by John Galt
gforce1140 Level 1 (0 points)

I need voltage reading for a 1.67 ghz g4 motherboard

PowerBook, Mac OS X (10.4)
  • BGreg Level 6 (17,495 points)

    For clarity, there's no such thing as a titanium 1.67Ghz PowerBook. There is, however, an aluminum 1.67Ghz Powerbook.


    Regarding the schematic, I've never seen one, and since the logic board isn't a field repairable unit, there's no voltages in the service document. 

  • gforce1140 Level 1 (0 points)

    I did not realize that about the Titanium. I don't agree that the logic board is not an serviceable item. I also find it odd that there is nothing available to give voltage readings for the logic board.

  • eww Level 9 (52,980 points)

    Apple has never published schematics for any of its proprietary boards. They are not considered to be serviceable because it is not cost-effective for a professional technician to diagnose and repair problems with the components on them, and it would be all but impossible to achieve enough consistency in such component-level repairs for them to be warrantable. This is not to say that someone with the right training, the right tools and the right information available couldn't successfully make such a repair from time to time, but it isn't worth Apple's while to train and equip all its technicians for that kind of work. For Apple, it's cheaper just to replace the board with a new one. For an individual end user with a lot of technical expertise and equipment and no remaining warranty, that may not be true, but then there is still the problem of no available schematics to refer to, and that's a high hurdle.

  • gforce1140 Level 1 (0 points)

    I do appreciate your reply. I have been a Mac person for many years,but I can't understand why everything has to be so complicated. Yes I probably Can not Fix my PowerBook,but at 67 years of age I have always tried to repair rather than replace.

  • eww Level 9 (52,980 points)

    It's very likely that you CAN repair your Powerbook -- not by repairing the logic board, but by replacing it with a working used one. The only question is how worthwhile it would be to do so. The Powerbook is old and obsolescent, if not obsolete, by current standards. But if you don't need to use it for multimedia, video, or browsing the latest super-whizbang web sites, it may not be obsolete for your purposes, and certainly an investment of a couple of hundred dollars for a used logic board would be preferable to paying $1000 or more for a new computer with capabilities vastly exceeding your needs.

  • John Galt Level 8 (45,968 points)

    Component level repair on almost every electronic product built since the 90s has become a lost art, for many reasons. Most components are surface mount, they have proprietary part numbers that make sense only to their manufacturer, and the boards have multiple layers. They are assembled and tested by machine, and if it fails it's thrown out since any human attempts to repair it are more likely to destroy it. Even the connectors between one board and another are extremely tiny and delicate.


    These days almost all electronic products and especially computers are repaired and usually even diagnosed at the board level. Something doesn't work, replace it. Still doesn't work, replace something else. We are living in a disposable age.


    If you could even get schematics, they would be nearly useless, even though you may have a thorough knowledge of digital electronic systems.


    If you want to fix your PowerBook, iFixit is a good resource for both repair procedures and parts. It is about as in-depth as any you are likely to find.