Trying to Resurrect a Macintosh Color Classic

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AmyBoz
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Trying to Resurrect a Macintosh Color Classic

Unread postby AmyBoz » Thu Jul 07, 2016 11:56 am

Hi all...

I am trying to resurrect my CoCla that was in my parents (dry) basement for the past 25 years. I cleaned the logic board with compressed air. If I remove the logic board, the machine turns on, however, once the logic board is replaced, the machine refuses to turn on. I ordered a new 3.6v battery and installed it, today, and nothing has changed. I was thinking it might be the keyboard connection, as it turns on from a button on the keyboard, but I'm not even getting an orange light on the Mac to indicate that it has power with the logic board in. I'd appreciate any thoughts!

nyef
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Re: Trying to Resurrect a Macintosh Color Classic

Unread postby nyef » Thu Jul 07, 2016 6:11 pm

25 years? I'd suggest that any electrolytic capacitors in the system are likely to be marginal at this point, and would be a good first thing to swap out to see if it helps.

The 3.6v battery being dead shouldn't prevent the system from starting up, it just keeps it from remembering things like which disk to boot by default, what time it is, and so on.

If I recall correctly, there may well be a second power button on the machine itself. Even with the power buttons on the keyboards, there was usually a second way to power the system up.

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Re: Trying to Resurrect a Macintosh Color Classic

Unread postby ClassicHasClass » Thu Jul 07, 2016 9:56 pm

Not that I recall on my Colour Classic; there's just a master power switch. Amy, you need to get the board recapped and that should fix it. Alternatively, the motherboard from an LC575 will fit, though it doesn't match with the rear ports punchout.
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Re: Trying to Resurrect a Macintosh Color Classic

Unread postby SiliconClassics » Thu Jul 14, 2016 5:31 am

At this point most the electrolytic caps in almost all Color Classics have failed and need to be replaced, preferably with tantalums. That could be the root of your problem. Be sure to wash any leaked electrolyte off your motherboard and be careful when removing the old caps because it's easy to lift a pad if you do it wrong. There are some good guides online if you Google around for them.

Could also be bad caps in the analog / power board, but you should start with the motherboard and see what happens. CCs have a power switch on the back but it's just a cutoff - the system is powered on via the keyboard only.
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robespierre
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Re: Trying to Resurrect a Macintosh Color Classic

Unread postby robespierre » Thu Jul 14, 2016 6:49 am

Apple seems to be the only company whose capacitors all leak. (It doesn't happen at all on NeXT computers, or Suns, or SGIs...)
It seems they used a harsher post-solder cleaning regimen that was destructive to the rubber seals of the capacitors.

There is no general problem with SMD capacitors leaking. You can replace them with direct substitutes.
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Re: Trying to Resurrect a Macintosh Color Classic

Unread postby ClassicHasClass » Thu Jul 14, 2016 9:10 am

It seems to be a problem mostly with the '030 Macs. Earlier systems and '040 Macs and later don't seem to suffer to near this extent, other than the infamous iMac G5 "troubles."
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:Fuel: bigred, 900MHz R16K, 4GB RAM, V12 DCD, 6.5.30
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Re: Trying to Resurrect a Macintosh Color Classic

Unread postby robespierre » Thu Jul 14, 2016 9:18 am

I've seen it happen in LC 475s and Quadra 840AVs. They eventually fixed whatever they were doing, but it wasn't until about 1995.
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Re: Trying to Resurrect a Macintosh Color Classic

Unread postby nekonoko » Thu Jul 28, 2016 10:15 am

Another thing I've found regarding the Color Classic is sometimes you can get them going without replacing the capacitors just by cleaning up the leaking electrolyte on the motherboard with some alcohol.
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