G5 PPC Dual 2.0GHZ racing fan issue!

Hi all, as my previous threads show I have had some serious headaches with this issue.
Anyway the saga continues....
I managed to get myself another logic board and fitted it in. The fans started to race - again! *Sigh*
But unlike before, they didn't start to race as soon as I turned the machine on and they didn't sound like
a jet engine in a hanger. Nonetheless they were still racing a little quieter and now they were starting
up once I could hear the hard drive kick in. Hmmmm
I installed a fresh version of 10.5 - no change.
I ran a system test - no change
I ran a thermal calib... Error on CPU1 - Tafs is out of range - processor needs replacing.
*for f***s sake!!!!
Anyway - I ran a Systems Diagnostic and went thru the stand alone tests systematically...
all the tests passed (curiously enough so did the CPU's) but the only one that failed was the
AMMETER SENSOR CPU B AD7417 AD4
Restarted and all is quiet! - *scratching my head now
Ran a Software Update, restarted - again, all is quiet!
Second Software update & 3 restarts later - all is still quiet!
Hopefully this remains quiet now but my question is... Is the AMMETER SENSOR failure fixable? Cheaply? Or anything to worry about??
Rak

Here are my readings:
Temps:
HD - 37
CPU A - 60
CPU A - Ambient - 29
CPU B - 51
CPU B - Ambient - 27
Backside - 40
Drive Bay - 25
U3 Heatsink - 51
Fans:
CPU A INT - 300rpm
CPU A EXH - 300rpm
CPU B INT - 300rpm
CPU B EXH - 300rpm
Drive Bay - 1000rpm
Slot - 76rpm
Backside - 51rpm
I'm burning a disc as we speak aswell so no signs of any ramping up of heat or fans.
I also did a stand alone test using the ASD for the AMMETER SENSOR CPU B AD7417 AD4 that failed. As I was advised it may be a script clash and I should run it once more after any firmware updates & it failed again.
There is an issue but general running of the machine isn't hindered in any way. Almost like there is nothing wrong.

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The ambient room temperature is approximately 74°F (23°C), the machine has at least 9" of space to the left and rear. The right and front sides of the case are unobstructed. The air coming out of the rear of the drive bay is 30°C and the air coming from the processor exhaust fans is about 38°C. The surface temperature of the case itself is about 25°C. Those numbers probably aren't very important, I just want to establish that the room and the case itself are quite cool, despite the U3's readings!
Since I've been worried this was airflow-related I've thoroughly cleaned all the fans to include the backside fan, drive bay fan and the graphics card's onboard fan. No change in this behavior.
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I left it iidle overnight (as I've done for the past six years) and the U3 Heatsink was sitting at 80, the Backside reading was 47 and the backside fan was spinning at 204RPM.
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Quote from: Svet on 11-April-14, 18:12:20
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I have seen a dual 1.8ghz (M9454LL/A) second hand with this spec:
Machine Type: Power Mac G5
Machine Model: PowerMac 7,3
CPU Type: PowerPC G5 (2.2)
Number of CPUs: 2
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Strangely enough, the answer to the problem was that the rpm controls in both the fan and the blower of the media bay were damaged. Power spike?
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amoysan wrote:
Should I go to an apple store ?
Can only help.
You can also run an Apple Hardware test to see if ant problems are discovered. Do not assume that a no-error result is definitive.
http://support.apple.com/kb/ht1509
Ciao.
A SMC reset might help:
http://support.apple.com/kb/ht3964
Message was edited by: OGELTHORPE

G5 PPC Dual 2.0GHZ racing fan issue!

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