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Power Mac G5 dp 1.8GHz fans @ full speed

K

kbfr08

macrumors 6502
Original poster
Mar 16, 2007
462
29
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.
 
B

bizzle

macrumors 6502a
Jun 29, 2008
940
40
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'.
 
K

kbfr08

macrumors 6502
Original poster
Mar 16, 2007
462
29
Yep, i've tried pram resets, nvram resets, everything that I could be reset was reset.
 
666sheep

666sheep

macrumors 68040
Dec 7, 2009
3,686
291
Poland
Try to disconnect sensor cable and see what happens. If sensor is OK, fan needs to be replaced.
 
K

kbfr08

macrumors 6502
Original poster
Mar 16, 2007
462
29
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.
 
OrangeSVTguy

OrangeSVTguy

macrumors 601
Sep 16, 2007
4,127
69
Northeastern Ohio
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...
 
666sheep

666sheep

macrumors 68040
Dec 7, 2009
3,686
291
Poland
If air deflector sensor would be defective, red diode at front of logic board should light.
 
666sheep

666sheep

macrumors 68040
Dec 7, 2009
3,686
291
Poland
kbfr08 said:
I've ran ASD 2.5.8 to calibrate and test the mobo, which passed.
Click to expand...

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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