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Old 06 July 2019, 02:34   #1
cyberhead97
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Cyberstorm MK1 Cpu board defekt repair

I have recently purchased a Cyberstorm MK1 with a CPU board that doesn’t boot when installed in my A4000.

Using a spare Cyberstorm MK1 I have been able to diagnose it and found that carrier board and 68060 cpu works fine, but not the CPU board. I took a closer look at the CPU board and discovered a resistor is missing/desoldered, see the attached picture.

Can the missing resistor be the reason why CPU board doesn’t work? And if I would repair it does anyone know of a replacement?
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Old 06 July 2019, 20:21   #2
slaapliedje
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That is one dirty board! My MK1 died a while back too. Turned on the Amiga one day and could smell it. Burned up the ram chip that was on it, and died a terrible death. Sent it off to Stanchu, who then created me an 040->060 adapter for the A3640, so had to lose out on the fast ram.
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Old 06 July 2019, 22:03   #3
nogginthenog
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I think that is a capacitor, more specifically a decoupling capacitor.
The board should still work without this but might be unreliable.

Clean it up and look for more damage.
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Old 09 July 2019, 23:45   #4
cyberhead97
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Quote:
Originally Posted by nogginthenog View Post
I think that is a capacitor, more specifically a decoupling capacitor.
The board should still work without this but might be unreliable.

Clean it up and look for more damage.
I gave the board a good cleanup and I can't spot any other damages.

Would it make sense to desolder one of the other capacitors to measure it and find a similar one?
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Old 11 July 2019, 21:05   #5
nogginthenog
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They are generally around 1 micro Farad. They act as a 'reservoir' of energy to keep the voltage stable. PCB designers add them to every chip.

It should still work without this.

I think your problem is somewhere else. It does look like this cap was desoldered. Is there any damage around that area?
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Old 01 November 2019, 01:07   #6
Timtheloon
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I'm in the same boat, got two CPU board which are defective!

maybe need to contact the guy on this thread because he has supposedly fixed his

http://eab.abime.net/showthread.php?...Cyberstorm+mk1
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