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| I need some help repairing my SE/30 Board |
Posted by: RCMediaAndTech on 2019-08-26 04:37:30
Hello,
My Macintosh SE/30 motherboard has been having issues since I received the computer in mid July. First of all, it used to turn on and do the simasimac, and death chimes but then I sent it out to MacCaps, and he tried to repair to no avail. It did the same thing when I got it back, so I tried washing the board in 5% White vinegar, but that didn't do anything. Any suggestions? Thanks!
-Ryan
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Posted by: Crutch on 2019-08-26 04:52:16
Did MacCaps actually recap the board for you? If so great, but you may still have leaked electrolyte on the board. I don’t think 5% white vinegar would do much (smells nice though in my opinion, and kills germs!), I would bathe it in 90% isopropyl alcohol and scrub it down with a toothbrush. Let it dry for a day, try again. Try swapping out both the RAM and ROM SIMMs if possible (RAM SIMMs are available cheap on eBay and elsewhere ... ROM might take a bit more patience to find one.). If none of that works your leaked caps probably damaged a trace or via and you might have to identify and repair it, or one of the ICs on the board might be bad, which I lack the skills to diagnose but someone else here can probably help with!
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Posted by: bibilit on 2019-08-26 05:43:43
I have repaired quite a few of those boards, first thing i do is clean the board.
I remove the capacitors and clean again the board locally, so in my opinion this has already been done.
Also, probably a swap test has been done with ram and rom to try troubleshooting the board.
I can be wrong but the death chimes means part of the boot process is working, any fault code is present when the death chimes are heard ?
And yes, Crutch is probably right, probably an IC or broken trace somewhere.
Also IIRC the 74F258 chips (near the Rom slot) can do that.
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Posted by: RCMediaAndTech on 2019-08-26 09:03:17
The thing is, the board doesn't do the death chimes anymore when powered on. What should I do?
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Posted by: Crutch on 2019-08-26 12:38:15
Oh sorry, what does it do now exactly then when you flip the switch?
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Posted by: RCMediaAndTech on 2019-08-26 16:12:59
It boots to the horizontal lines. I tried cleaningthe board with isopropyl alcohol, but it didn't work either.
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Posted by: Crutch on 2019-08-26 17:26:03
Sounds like (1) you have bad ROM or it can’t see the ROM (try swapping the ROM as a couple of us have suggested), or (2) another component has failed. One thing to try is see if your symptoms are described in The Dead Mac Scrolls - the PDF is available online if you google it.
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Posted by: RCMediaAndTech on 2019-08-27 06:13:58
I have 2 ROMs, but none of them seem to work, as there are no chimes of death anymore. I checked The Dead Mac Scrolls and I couldn't find anything on the Simasimac on the SE/30. Anyways, I lack the expertise to repair this board, and I think I might need someone else to help me repair this motherboard. Either that or I would gladly buy a SE/30 if anyone has any. Thanks!
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