Hi all... On Feb 4, 2011, at 7:39 PM, Clark Martin wrote:
> > On Feb 4, 2011, at 6:51 PM, Amanda Ward wrote: > >> Hi All... >> >> A problem with my iMac G5... 1st Gen, 20 inch, 1.8 GHz, 1 GB ram, 500 GB HD, >> Airport Ext., Bluetooth. I think that's about it. >> >> The problem... a while back it started going into sleep when playing videos >> (with VLC). As time went on, it seemed to take less and less time for it to >> do so. Now it is shutting down every time I try to start it up. Gets to the >> spinning wheel and then just *blink*... it shuts down. >> >> The person I got it from told me the power supply had been replaced. Just >> wondering if the Pram battery could be bad? >> > > I got a dead iMac G5 from a client. I started by looking at the logic board. > It had a number of bulging caps on it, this is a known problem. I replaced > all of them and then some. Still woudn't start up. I looked in the power > supply and it too had some bulging caps. I replaced some of them but I ran > into some troubles with it so I ended up buy a rebuilt supply from e-Bay. > Once I put that in it booted right up and has been fine ever since. > > So based on that I would have a look at the caps on the logic board. You can > find take apart instructions at www.ifixit.com. Once you take the back off > you can see if the caps are bulging. There are a couple of dozen all told in > a group roughly at the bottom center (going from memory there). They are > cylinders 3/4" high by 1/2" diameter (very rough dimensions). If some of > them are bulging that is likely your problem. > > If you know how to solder you can replace the bulging ones I replaced all the > caps in each group if just one was bulging. It's bit tricky as they are > soldered in with lead free solder, it has a higher melting point than leaded > solder. If you don't know how to solder (this isn't the time to learn) maybe > you can find someone who can. > > Clark Martin > Redwood City, CA, USA > Macintosh / Internet Consulting Thanks to Clark and Jonas for their responses!!!! I did some trouble shooting. First of all the capacitors look fine, no bulges or leaks. On the mainboard the led's (three of them) light up before the system shuts down. However, starting with the internal power switch, the system starts up and keeps running. THEN... starting with the external switch again, it keeps running. (Insert picture of confused person scratching head!) The new problem... it gets to the grey Apple logo with the spinning widget and just stays there. After a bit the fans shift into high gear. I've reset the pram and nvram. Tried to start up from the Leopard dvd holding down the c key, but nope. Tried booting holding down the "Option" key... still nothing. I can get into open firmware. but I can't get it to boot Any thoughts? Thanks again, Amanda -- You received this message because you are a member of the iMac Group, a group for those using Apple iMacs and eMacs. The list FAQ is at http://lowendmac.com/imac/list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to imaclist@googlegroups.com To leave this group, send email to imaclist+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/imaclist
