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Author Topic: Restoring the Quicksilver power supply  (Read 4963 times)

V.Yakob

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Restoring the Quicksilver power supply
« on: February 06, 2023, 12:55:24 PM »

Does anyone have experience restoring power supplies from Quicksilver?
The one I have has a problem and doesn't work.

Power supply P/N: 614-0146
Symptom:
1. clicks something in the middle of the board
2. the cooler rotates and stops
3. the output power supply is unstable and jumps, for example, where it should be 12v, shows: 7v, 3v, 5v, 9v. Even on-duty power supply (purple wire) is not stable.
I suspect that protection is triggered in the power supply.
There was a suspicion that the reason for this behavior could be in high-voltage capacitors (450V, 100 μF), they were really inoperable, the tester showed 90 μF and ESR=1.4 Ω on one and 90 μF and ESR=13 Ω on the other.
The replacement of capacitors has not brought major changes.
Outwardly, the details don't look spoiled.
Maybe someone has a scheme of this power supply? Unfortunately, I have no place to get another power supply.

I will be glad to receive any advice.
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PPC — PM 8100/80, PM 9600/300, PM G3 Minitower (Rev. C), PM G3 B&W (Rev. B), PM G4 Quicksilver (2002), PM G4 MDD (2003), PM G5 (Late 2005).
Intel — Mac mini (mid 2010), iMac 5k (2017), Mac mini (2018).
AppleSilicon — Mac mini (2020), Mac Studio M2 Max + Apple Studio Display.

ssp3

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Re: Restoring the Quicksilver power supply
« Reply #1 on: February 06, 2023, 02:04:09 PM »

Check my posts in this thread, I posted a couple of hints there:

http://macos9lives.com/smforum/index.php/topic,5341.msg39042.html#msg39042
« Last Edit: February 06, 2023, 07:24:55 PM by ssp3 »
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