68kMLA Classic Interface
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| Click here to select a new forum. | | LC 575 hangs at Welcome to Macintosh screen | Posted by: beachycove on 2013-01-26 07:29:44
It was long ago and I forget the details, but there is an older lc pds ethernet card in my stash that will definitely prevent a comparable (LC475) machine from booting. I don't know if the trouble is the card, a missing driver, or the 040 versus 030 implementation of the pds slot (e.g., the 030 implementation allows for a 68882 co-processor, which no workie with an 040). So it's not necessarily logic board capacitors. You might just need a different network card.
What make is it?
| Posted by: uniserver on 2013-01-26 08:20:42
Is this nic card something you've recently added?
| Posted by: pbMacGeek17 on 2013-02-02 21:05:31
I replaced the two 100 microfarad, 6V capacitors on the logic board and voila! everything was good again. The bottom line was that the computer was locking up during the bootup sequence when it tried to wake up the Ethernet card. Those two caps are obviously crucial in supporting communications with the PDS slot. As uniserver and others have pointed out, it's best to replace ALL the caps on an old Macintosh before even trying to debug a hardware problem. I have to admit to getting sidetracked since the symptoms matched a condition someone else had attributed to a hard drive problem and the board did not show any signs of cap leakage. I could have isolated the problem earlier, but was not diligent enough to document what I had/had not done in the first place, i.e. verified operation with/without the Ethernet card. Finally, I need to apologize for my earlier rant at uniserver. I wasn't that frustrated, but it's difficult to sense attitude in emails and I didn't appreciate what I felt were disparaging comments. I really do appreciate all the help that you folks provide on this site; I couldn't have fixed either my SE/30 or the LC 575 without it. :b&w:
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