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Replace noisy PSU fan in G4 733MHz?
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Forum Regular
Join Date: Jun 2000
Location: Freiburg
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How do I replace a noisy PSU fan in a 733MHz G4 (2.0) PM 3.5 ?
How do I detach the plastic back panel?
Which fan is smooothly quite?
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Cheers, Hans M. Aus, Würzburg,
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Baninated
Join Date: Jul 2005
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it's a big pain in the ass. You ahve to remove the power supply first. Then take it apart and try not to die.
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Forum Regular
Join Date: Jun 2000
Location: Freiburg
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Does the Apple dealer have a smooothly quite fan replacement?
Has anyone had it done and is there a part number?
Looking at the back panel I assumed one could get at the fan by removing the plastic cover 
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Cheers, Hans M. Aus, Würzburg,
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Moderator  Join Date: May 2001
Location: Hilbert space
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If you are looking for good fans, Pabst is the way to go. Not as quiet as Verax, but robust and not as expensive. You have to take the PSU apart (be careful no to touch any other parts, there might be some juice left). My guesstimate is that it's an 80 mm fan which runs at 12 V.
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I don't suffer from insanity, I enjoy every minute of it.
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Baninated
Join Date: Jul 2005
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Yep. It is an 80mm fan, and it does use 12 volts. However, sometimes they're soldered in. Othertimes they have big cables glued all over the fan's outer housing.
Pain in the rear.
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Fresh-Faced Recruit
Join Date: Jan 2003
Location: Colorado
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the fan in your PSU is most likely a 80x80x25mm fan. Replacing it will involve removing the PSU completely, opening it up and then replacing the fan. Be carefull though, the capacitors in the PSU will still be charged and waiting to blast you across the room.
I'd suggest looking at http://www.silenx.com/sx_fan_80.asp for some great, very quiet fans.
Be aware, any replacement fan you get will most likely have a 3pin or 4 pin connector. The original fan in your PSU uses a less common 2pin connector. This means you'll either have to splice the new fan to the old connector or run the power wires out of the PSU and into the standard wiring harness using a molex connector. In turn this leaves the stock power connector bare which will really upset the mac, to the point that it may shut itself down shortly after starting up. The solution is to place a resistor on the power connector to fool the system into thinking the original fan is still in place.
Hope that helps.
Regards.
UPDATE: Turns out Google is my friend. 3 pin to 2 pin fan adapters are available .
(Last edited by tsukurite; Aug 12, 2005 at 02:23 PM.
(Reason:correction))
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