Greetings: I recently acquired a broken iMac 17" 1.7/1.8 GHz G5 iMac. The previous owner stated that the logic board is the problem. It could be, but I am having some trouble accepting this diagnosis because I finally got into it today and started looking around.
I would dearly love to find the actual service source on this beast, because I think it would shed a lot of light on things, but here is what I am looking at: 1. Once the back is off the unit, the inside power switch gets the machine to come up to LED 3 (on the four diagnostic LEDS in the middle of the board)... 4 never lights. The machine will run (no chime, no boot, no LCD) and you can hear the hard disk and DVD drive running and the fans ramp up to full speed pretty quickly (within 4 minutes). 2. I replace the back and hit the power switch on the back and the front white LED will come on for 1 second and the machine immediately shuts down. (back off, runs for a while). Again, it could be the Logic Board, but I am also suspicious of the inverter and the power supply, because when I started the diagnosis, the number 1 LED was kind of flashing but did not go solid until I hit the SMU. It seems the number 1 Diag LED goes between this slow flashing state and solid. There are no bad CAPS that I can see on the LB, though I did buy replacements. Can someone tell me definitively what I should be looking at. BTW: With the back removed and the machine running -- the number 4 LED *NEVER* lights... and the machine *NEVER* chimes or completely boots, but the fans and devices do run without it shutting down. Help is much appreciated. I also need to find a very inexpensive line on the parts I need because I just can't see putting a bunch of money in this unit... though it is in VERY nice condition cosmetically! Hope someone can help. Thanks, MIke Needham Lawrence, Kansas 66046 -- 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 [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/imaclist
