>1. GREEN LIGHT (constantly lit) >--battery out with AC connected results in resetting Power Manager on first >try every time that I've tried it (no more need for multiple resets). Actually, the steady green light indicates that the power manager has been completely reset and needs to be reloaded (by booting the Mac OS). This is in fact a good sign, since it indicates the Power Manager chip is working at least well enough to recognise this and keep the LED lit. The click of death syndrome is thus pretty much the same whether the light is on or not (if it's not, you can easily make it come on by pulling the motherboard battery for a minute or so). My current theory (to be tested when I get hold of an intact CPU card to test with) is that most problems stem from a poor connection between the CPU card and motherboard. This would explain the same symptoms being ascribed in different cases to the boards on either side of that connector. My discovery in my recently (third time) dead 2400 of the connector's physically coming apart (splitting at the base) has only strengthened the hunch. I'll post a followup here when I receive a board I can test with, but basically, I think the power manager has been a red herring because of the obvious green light it presents. It's worth noting that a 2400 will produce the same "click of death" if you remove the CPU card completely (worth trying in my case since it pretty much was anyway, by the parted connector), and that the Power Manager chip is one of the few independent components that can function without a reliable (or any) connection to the CPU card. >3. MOTHERBOARD SWAPS >I would contend that probably over 50% of the 2400s shipped off for repair >of motherboards probably don't actually need an MB repair/replacement. The >troublesome PM reset, unsuccessfully executed, seems terminal. A disassembly >of the 2400 actually drains the PRAM battery and the PM is usually easily >reset after that when out for service. For those of you whose boards have >been returned as repaired, without procedural documentation even if >requested, this is a probable explanation. Yup, this is my feeling as well. You can see how this too jibes with the connector-failure theory. >with caution, apart from the usual precautions. Each 2400 motherboard >appears to be matched to its originally installed power board (possibly both >were matched tech revisions, but I haven't looked that closely). I'm not so sure about this. It's possible that the I/O board was revised partway through the production run (or perhaps for the 240MHz model), but it's very easy to be misled by circumstance in testing when you have such a small sample to go on and when the symptoms and resolution are so fuzzy to begin with. Those failures might be merely coincidental. However, if connector tolerance is poor on the I/O board connector as well as the CPU one, perhaps the same theory could apply - any two boards which seated poorly together would eventually suffer a failure. This would make it pretty much a crapshoot whether a specific replacement (or indeed original board set in a factory 2400) would work in the long term. Which is of course pretty much what's been observed. ;) Marc Sira | [EMAIL PROTECTED] If you can't play with words, what good are they? ---------- Duo/2400 List, The friendliest place on the Net! A listserv for users and fans of Mac subportables. FAQ at <http://www.themacintoshguy.com/lists/DuoListFAQ.shtml> Be sure to visit Mac2400! <http://www.sineware.com/mac2400> To unsubscribe, E-mail to: <[EMAIL PROTECTED]> To switch to the DIGEST mode, E-mail to <[EMAIL PROTECTED]> Need help from a real person? Try. <[EMAIL PROTECTED]> ---------- Dr. Bott | Great Duo & 2400 stuff including 10/100 Ethernet for 2400s! Dr. Bott | Duo Batts too <http://www.drbott.com/prod/alist/duo.html> NineWire | If they are cool enough to host this list... Digital Solutions | ...you should check them out! http://www.NineWire.com/ PowerBook Guy is | Click here! Everything PowerBook! | http://www.powerbookguy.com Midwest Mac Parts ][ <http://www.midwestmac.com> After-market parts for Macs. ][ 888-356-1104 ][ MacResQ Specials: LaCie SCSI CDR From $99! PowerBook 3400/200 Only $879! Norton AntiVirus 6 Only $19! We Stock PARTS! <http://www.macresq.com>
