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PowerMac G5는 Apple Corporation에서 2003년에 처음 제조한 데스크톱 컴퓨터입니다. 이 안내서는 2004년 Apple PowerMac G5 모델 번호 A1047 EMC 2061의 수리 과정을 검토합니다. 2006년에 먼저 개발자에게 그 후 소비자에게 Intel 스위치의 일환으로 판매가 중단되었습니다.

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Fan speeds up by - mouse or graphic card / G5 2x2,5GHz

G5: PowerMac7,3

CPU: PowerPC G5 (3.0)

CPU-nol: 2

CPU-speed: 2.5 GHz

L2-cache (per CPU): 512 K

Memory: 4 GB

Busspeed: 1.25 GHz

Boot ROM-version: 5.1.8f7

Fan speed up when the mouse is turning.

I have previously believed that it was "Memory Heat Sink " - sensor that caused the problem.

It shows a temperature of 71-81 ° Celsius.

But when I "move" the mouse - the fans will increase as a consequence of this.

If I spin the wheel on the mouse to scroll a web page, it will increases the fans.

Likewise, if I drag the mouse back and forth over the Dock-menu.

In Bouth cases the MHS-sensor do a quick temp. increase - and I don't know - if the Temp. is affecting fan, or the graphic card?

The fan speed up problem - is - as I see it - not fully related to temperature, because sometimes Temp. is higher - without the fan speed up. The only sensor showing "hi" is Memory Heat Sink. Even when the MHS is colder - mouse makes fan to speed up. The CPU Temp. is around 50° C +- 5° with nervous behave in the temp. curves.

I also have notice that the temperature is wobbling, with +-1 ° / per second, with quick differences . The temp. Sensor Windows shows a nervous curve.

Could it be some kind of Capacitor-problem behind that???

(Is it possible to get map over the motherboard, showing the electrical spec)

How should I deal with this problem?

What Temp is normal from "Memory Heat Sink" - sensor ?

Do anyone have the technical spec 4 The Memory Heat Sink Sensor?? ( I believe that is a resistor temperature sensor)

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hej göran,

still working on the powermac ?

in my opinion is the graphics card the bad boy in the described case - since the mouse pointer is also work for the gpu - it could make some "problems" - maybe the heat sink of the graphics card is not well placed (the adhesive sometimes fails)

if i remember right, you wrote about your 3 powermacs - is it possible to change the graphics card with a working one of the other power macs ?

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This is my solution - and it makes stability to the fans "overreaction" who makes them running up and down.

I increase the step value of "MaxTempDeltaBeforeIncrease" from 20 to 40 in appleBlower.kext --> info.plist

Then i Lower the "fan-hysteresis-temp" and the to first step in "fan-speed-table" with 2°C in the AppleFan.kext --> info.plist.

The array's has to divided with 256 to get temp.

Block Image

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First of all i'd reset the SMU by letting the computer unplugged for a few minutes and pressing and holding the startswitch for a few seconds before plugging it back in.

Also you could recalibrate the fan controls using Apple Service Diagnostic for Power Mac G5 - to be found here:

http://www.info.apple.com/discimages/.

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hi karsten, göran is way beyond that point - but under normal conditions - i would agree.

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OK, i didn't know

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