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Old Jun 25, 2010, 01:27 PM   #1
kbfr08
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Power Mac G5 dp 1.8GHz fans @ full speed

My PCI bay fan is running at full speed no matter what. The temperature sensor reads correctly in OS X, so I don't think it's a bad sensor.

Is there any way to set the fan speed manually, say in openfirmware?

It's a 1.8 DP June '04; I've ran ASD 2.5.8 to calibrate and test the mobo, which passed.
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Old Jun 26, 2010, 04:22 PM   #2
max••
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you could try this although i have never tried it
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Old Jun 26, 2010, 04:42 PM   #3
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smcFanControl does not work on PowerPC Macs.

Have you tried resetting Open Firmware? Boot into Open Firmware by holding Option-Command-O-F and type 'reset-nvram' and 'reset-all'.
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Old Jun 26, 2010, 04:44 PM   #4
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Quote:
Originally Posted by bizzle View Post
smcFanControl does not work on PowerPC Macs.

Have you tried resetting Open Firmware? Boot into Open Firmware by holding Option-Command-O-F and type 'reset-nvram' and 'reset-all'.
oh, didn't know that
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Old Jun 26, 2010, 11:27 PM   #5
kbfr08
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Yep, i've tried pram resets, nvram resets, everything that I could be reset was reset.
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Old Jun 27, 2010, 03:05 AM   #6
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Try to disconnect sensor cable and see what happens. If sensor is OK, fan needs to be replaced.
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Old Jun 28, 2010, 10:44 PM   #7
kbfr08
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every fan runs at full speed when the sensor cable is disconnected. Anyway, I did a complete rebuild of the G5 and it made no difference either.
I just installed a quiet fan on the FX5200 using a 12VCC pin on one of the ICs to keep the card from overheating. The large fan is now unplugged until I find a solution.

Last edited by kbfr08; Jun 29, 2010 at 01:37 AM.
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Old Jul 8, 2010, 02:58 PM   #8
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Are you running it without the clear air baffle? Try sticking a piece of paper folded up in the far right slot. It's at the bottom right hand corner when you remove the side door. There's a little sensor there that will tell the fans to ramp up if the air baffle is not present. It could also be defective...
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Old Jul 8, 2010, 03:05 PM   #9
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If air deflector sensor would be defective, red diode at front of logic board should light.
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Old Jul 9, 2010, 07:04 AM   #10
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Exactly, the CPUs' haven't been removed? Some of them need re calibrating if there removed from the logic board.
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Old Jul 9, 2010, 11:44 AM   #11
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Quote:
Originally Posted by toolbox View Post
Exactly, the CPUs' haven't been removed? Some of them need re calibrating if there removed from the logic board.
Good point! OP, Reboot the G5 with the ASD disc and then run a thermal calibration.
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Old Jul 9, 2010, 01:19 PM   #12
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Quote:
Originally Posted by kbfr08 View Post
I've ran ASD 2.5.8 to calibrate and test the mobo, which passed.
Recalibration was done by OP. Besides, as long as CPUs were removed but not swapped between sockets (or replaced), recalibration shouldn't be required.
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Old Jul 9, 2010, 07:40 PM   #13
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I have also had a faulty Thermister also. That was making the fans roar constantly. I replaced that and it settled down
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