Jeff, Thanks for your advice.
I have several spare Mac IIci(s). Tried switching off the power strip, switcing it on and then wihtin a second or two hitting the on switch separately form the keyboard and then from the switch on the rear of the CPU. Nohting. Pulled the power supply from a unit that was known to be working and R&R with the power supply in the CPU that was not working. No soap. Finally R&R the internal drive with my data and software and swapped it into another IIci CPU. Booted up and everything works. in other words, I gave up. However, I shall use your advice on the CPU that was not working and experiment by trying some of the fixes you suggested to see if I can make it operational. Thanks for the tips and the benefit of your experience. Mel --- Jeff Walther <[EMAIL PROTECTED]> wrote: > At 15:30 -0400 08/04/2005, System6 wrote: > >Date: Thu, 4 Aug 2005 06:34:58 -0700 (PDT) > >From: Mel <[EMAIL PROTECTED]> > > >This morning, when I hit the start button, the > three > >lights above the three buttons (num lock, caps lock > >and scroll lock) and the green light at the lower > >right of the CPU came on simultaneously; the CPU > >emitted a very short chime but the CPU never came > on > >nor did the monitor. > > First, you'd probably have better luck with this > question on Vintage > Macs list, because it is a hardware question, not a > System 6 question. > > Second, there are two possibilities. You could have > a failed power > supply or a failed motherboard. > > Power Supply: I don't remember the details, > unfortunately, though > some time with Deja News might pull up relevant > posts, but there's a > fairly common failure mode for the power supply > which, IIRC, may > cause this issue. > > Logic Board: On these old logic boards the > electrolytic capacitors > leak and the leakage is corrosive. Pull the LB, > examine it closely, > holding it at various angles to the light and look > for discolored > areas (brownish) in the rear right corner. If you > find some, clean > it up with swabs and isopropyl (rubbing) alcohol. > Examine the area > carefully for pitted and corroded leads and solder. > You may find > connections that are eaten through. An ohmmeter > (continuity meter) > is handy for this examination. > > Some folks have had luck simply cleaning the > corrosive off, but for a > good fix, you need to remove the old caps and > replace them, > preferably with tantalum caps which won't leak. > > The surface mount electrolytic caps are the little > round silver cans > on teh board. There's about a dozen fat ones > (~1/4") and a handful > of thin ones (~1/8"). > > Marc Schrier's Clock Chipping Home Page has > instructions on removing > surface mount resistors using the two soldering > pencil method and > this is relevant to remving SM caps as well. > > Replacement caps in tantalum or electrolytic are > available at > Digi-key and other places. > > The unfortunate fact is that a huge number of these > grand old > machines are experiencing this type of failure. > We're seeing a lot > of the SE/30s with the same problem over on the > Classic Mac list. > > I had this failure in my IIci back in the mid-90s > when a IIci was > still worth close to $1000. I had to bypass a > corroded via (a hole > that takes a connection from front to back of > circuit board) with a > bit of wire wrap to fix mine. > > Jeff Walther > > -- > System6 is sponsored by <http://lowendmac.com/> > and... > > 123Inkjets.com > <http://lowendmac.com/ad/123inkjets.html> > > Support Low End Mac > <http://lowendmac.com/lists/support.html> > > System 6 Heaven > <http://www.euronet.nl/users/mvdk/system_6_heaven.html> > > System6 info: > <http://lowendmac.com/lists/system6.html> > --> AOL users, remove "mailto:"; > Send list messages to: > <mailto:system6@mail.maclaunch.com> > To unsubscribe, email: > <mailto:[EMAIL PROTECTED]> > For digest mode, email: > <mailto:[EMAIL PROTECTED]> > Subscription questions: > <mailto:[EMAIL PROTECTED]> > Archive: > <http://www.mail-archive.com/system6%40mail.maclaunch.com/> > > --------------------------------------------------------------- > iPod Accessories for Less > at 1-800-iPOD.COM > Fast Delivery, Low Price, Good Deals > www.1800ipod.com > --------------------------------------------------------------- > -- System6 is sponsored by <http://lowendmac.com/> and... 123Inkjets.com <http://lowendmac.com/ad/123inkjets.html> Support Low End Mac <http://lowendmac.com/lists/support.html> System 6 Heaven <http://www.euronet.nl/users/mvdk/system_6_heaven.html> System6 info: <http://lowendmac.com/lists/system6.html> --> AOL users, remove "mailto:"; Send list messages to: <mailto:system6@mail.maclaunch.com> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/system6%40mail.maclaunch.com/> --------------------------------------------------------------- iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deals www.1800ipod.com ---------------------------------------------------------------
