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Ce Power Mac G4 est muni de "Mirrored Drive Doors" qu'on pourrait traduire par "Porte de lecteur miroir".

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I have a power problem on my FW800

Sorry for posting on such an old thread, but i have a power problem on my FW800. Started months ago, and i have swapped the power button board assembly and cable, then the machine started. But that didn't last long. After a short while same thing, and i swapped the second button board with the original, and surprisingly it all went ok for a little while again.

Current status is, pressing the button light comes on instantly, and that's all. My understanding is that all MDDs carry the same PSU? A tech guy suggested measuring amperage of the power supply. How do y'all measure voltages by the way? Is it correct that the psu needs to be plugged on the mobo?

Thanks in advance!

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This does sound like a failing/failed PSU. The most likely issue is failing capacitors in the PSU itself which was common with the CapXcom capacitors used in both PSUs found in the MDD G4s. The two PSUs found in the MDD G4s were either the AcBel 400W or the Samsung 360W depending on configuration.

As for measuring the voltages you will have to have to have it plugged into the motherboard as the PSU has to have a complete circuit for it to provide the voltage. Do note that even though it does have a 24-pin connector to the motherboard it is not a standard ATX and has a different pin layout as well as a special 25V rail for driving ADC displays. I unfortunately do not remember the exact pin layout but to check carefully use a voltmeter between the exposed metal of the case chassis for ground and each individual exposed contact of the 24-pin connector on the backside of the motherboard. Be sure to record your measurements. There are:

  • 4x +12V pins
  • 1x -12V pin
  • 4x +3.3V pins
  • 4x +5V pins
  • 1x +25V pin
  • remainder are ground and 1 power on pin which should all read 0V

If you are comfortable with taking apart the PSU and replacing and soldering in new components you could have a look through this thread on Bad Caps forum for more information. Otherwise you could try finding a refurbished unit or having your PSU repaired like offered here on eBay.

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Will Kar sera éternellement reconnaissant.
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