On Dec 1, 2011, at 2:04 AM, Lists wrote: > I'm pretty sure, when Apple *did* start using USB internally, they routed the > keyboard and trackpad through the *same* USB hub (erm, is that the correct > term?) as the external ports,
No I do know that the USB keyboard and mouse have always presented as a separate hub. I'll have to look in System Profiler on my PBG4 at home tonight to see what it is. > so you'd kind of expect a global USB failure to be present. So, if it is > internally USB, the only other think I can think of, past what has already > been suggested, is that the actual keyboard/trackpad device might be having > an issue as a USB HID? Is it a self contained unit, or is some of the device > broken out on to the main logic board? > The keyboard and trackpad are separate units, but are interconnected on the wiring. Stray thought just hit me....Web cameras and the like use CCD's that are quite sensitive in the IR (point a TV remote at your web cam and press the buttons see what you see), and actually have IR filters so they don't burn out in bright light. These filters are reasonably easy to remove <http://www.instructables.com/id/Making-a-Night-Vision-Webcam/> I wonder if such a modified web cam might not be a useful tool for identifying possible electronics failures, as the typical failure mode for intermittent issues like this is a short circuit or poor connection that breaks when something runs too hot; aiming a modified camera at the logic board might identify the 'hot spots', helping isolate the problems... -- Bruce Johnson University of Arizona College of Pharmacy Information Technology Group Institutions do not have opinions, merely customs -- You received this message because you are a member of G-Books, a group for those using G3 iBooks and PowerBooks (we run a separate list for G4 'Books). The list FAQ is at http://lowendmac.com/lists/g-books.html and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/g-books Support for older Macs: http://lowendmac.com/services/
