Dead 'French' Classic Color ?

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Joined: Sep 14 2012
Posts: 3

Hello,

I live in France and I am the (happy ?) owner of a ... dead Classic Color Macintosh... So please sorry for the mistakes I could write in the text bellow.

Well this CC comes in pretty well condition, with all the stuffs, manual, floppies for installation etc... But the fact is that it doesn't start.

Everything has been checked (new battery, fuse, adb keyboard, adb cable) but ... The green & small light on the front panel is off.

The strange thing is that when I remove the mother board, and then press the power switch, I can ear a 'boing' sound that seems to go to the screen. I can even ear a small sound, (like a capacitor) especially when the power cable has been disconnected for a longer time.
And so if I insert the motheboard (with the power switch 'On'), this 'powersound' disapears...

Thinking that it was the motherboard and bad capacitors, I have replaced all of them. There were indeed small very small marks of leakage aroud & behind the caps (the surface around is not as shiny than the rest of the board, that looks +/- new).

But the result is nothing : definitely the only thing I got is a dark screen and the problem remains the same.

Any new idea ?

Thank you in advance for your help.
Best regards

Sébastien - France

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Joined: Apr 11 2012
Posts: 75
Re: Dead 'French' Classic Color ?

Time for a Power Color Classic Mod?

Sorry if that seems a bit harsh, but if worse comes to worse it will give you somewhere to go.

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eeun's picture
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Joined: Dec 19 2003
Posts: 1891
Re: Dead 'French' Classic Color ?

Salut, Sébastien
I recall one of my Colour Classics had the same problem, and I traced it to a poor connection where the analog board (the upper high-voltage board) plugs into the wiring loom that connects it to the lower motherboard. There's a metal shield that has a slight upward angle, and either it was making contact with something on the board, or the contacts on the board were dirty and not making a good connection.

I also remember the speaker connection was an issue, either because of a similar problem the speaker wouldn't work, or the Mac would only power up if I disconnected the speaker. Apologies, it's been a long time since I owned a Colour Classic.

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Joined: Sep 14 2012
Posts: 3
Re: Dead 'French' Classic Color ?

Hello,

Thank you for these first ideas.
I will check the upper power supply board (the analogic board) and all the electrical connections. I hope that the motherboard is still working Undecided

In the meanwhile, I may have found someone who could give me a stock CC, that is not in good shape because has been used for professional usage for 18 years! The floppy seems to be dead, but the computer is still working... So !

regards

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Joined: Sep 14 2012
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Re: Dead 'French' Classic Color ?

Hi everyone.
I always try to find out what going wrong with the original analog board. I can only hear a high-pitched sound when I switch on from the rear button. But nothing else with the keyboard.
The mother board is OK.

Previously Some one gave me a CC for parts. It works, but a few month later, the picture went bad (distortion ; too bright).
Then suddently the screen came dark, with a bright horizontal line. This analog board (number 2) seems now to have problem with a cap (the CF8, 3300 uF - 16V - 85C), and the 2 diodes DL21 & DL22 as well…

Not easy !

Regards

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Joined: Oct 4 2005
Posts: 2616
Re: Dead 'French' Classic Color ?

Sébastien,

It sounds like you've had the case apart already.

Be careful to let it set for a while (possibly 24 hours) to be sure
the CRT has discharged.

One of the things you can check for your screen is the CRT Harness
at the end of the Tube.
It has been a while, so forgive me if I am incorrect, but I believe that this harness attaches to Analog Card 2.
Check your connections and make sure they're tight.

Do you have the Repair Guide for the CC?

Steven Smile

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eeun's picture
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Joined: Dec 19 2003
Posts: 1891
Re: Dead 'French' Classic Color ?

Hi, Sébastien;

I've just obtained a Color Classic, and it exhibited the same symptoms as yours in your first post. One thing I noticed is there is some leakage visible around the capacitors.

After a quick wash with mild detergent and a dry with compressed air, it's working. Despite not swapping the capacitors, which I was reluctant to do until I exhausted other options.

The darn thing is, up until two months ago I had a spare CC logic board. It might have been missing components, but might have been handy. I did a big purge and got rid of it, thinking I'd never come across a Color Classic again. :Smile

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