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PPC G5 Quad 2.5GHz Thermal Calibration

I have two G5 Quads - One is a 2005 build year and the other is a 2006 build year CK618- - - - - - - - -)

Both machines run lovely

I have a DVD that a Apple Technican gave me from a servicecentre

It is a Apple Therimal Calabration workshop disc 2.6.3 especially for the PPC Quad 2.5GHz

I have a problem when calibrating the one machine. (serial number CK547- - - - - - - - -)

It comes up with this a warning:

I have taaken the Plastic Air Door on and off now during end of test when it says above - The Red & Yellow & Green lights come on (above the Ram at side of Ram slots) - so it knows the plastic door is off - the Large INTAKE Aiir Fans slow down in front of Radiator.

When the Plastic air door is put back on - the fan speed up again. (in test mode see pic above)

I have also put in other Large INTAKE Aiir Fans ( I have purchased 5 of these which I have in the store room - in case a unit went down)

This has no effect - I still get the message.

All the other tests - using this Apple Workshop Disc 2.6.3 - ALL PASS with flying colours

PS - The machines ARE MINT INSIDE - and when I say you could eat your dinner I mean it - theres NO DUST (they are just like they ahve come out of the box - They are always on sleep - I start them up once a week for about 7 hours. They Sleep well - when asked (No Panic Kernals)

They are just fine - except the above problem.

PS - The above machine used to pass this test.

Theres NO collent leaks (Both machines have the Last Panasonic Cooling System MK3) see pic

Has anyone got a fix.

Thanks

kk69

PowerMac, Mac OS X (10.5.8), G5 Quad 2.5GHz - 16GB Ram (2006)

Posted on Apr 21, 2012 3:04 AM

37 replies

Jan 4, 2013 11:58 AM in response to Stygimoloch

Stygimoloch wrote:

The sensor is on the logicboard, you will need a new logicboard.

Are we taking about this sensor ? as pictured above

But I cant see how it effects the Themo Calibration & Door ? - as its not part of it

Jan 4, 2013 12:02 PM in response to Kentuckykid69

Any sensor failure will cause a calibration failure. If it does not know the ambient temperature it does not know if the CPU reading is correct (no point of reference).

Jan 4, 2013 12:08 PM in response to Stygimoloch

Hi Stygimoloch

Thanks for the reply

Question - The above pictures - " is this the Sensor you think is faulty " ?

Where does that Black wire go on the picture - as I have a colour picture from G5 Manual and theres no place on Mother Board it attaches to ?

If I can find the end of this BLACK WIRE - I can test it to see if it works

japamac

Level 7

24,400 points

Jan 4, 2013 5:19 PM in response to Kentuckykid69

All sensors are wired to connect to the logic board to be processed and controlled by chipset and system kexts.

No one sensor is independent of the sensor and cooling system of the G5. The cooling is the sum of the 4 "compartments" and multiple sensors.

However, individual sensor failure and replacement (dependant on which) is possible.

Jan 5, 2013 1:07 AM in response to japamac

Hi japamac

Would you know where the

Main Logic Board Air Inlet sensor is ?

if you do you have a picture of location

Cheers

japamac

Level 7

24,400 points

Jan 5, 2013 3:49 AM in response to Kentuckykid69

The Ambient Temp Sensor board?

Page 149 shows it.

Page 131 mentions the required room temps for calibration (77ºF/25ºC).

Other sensors are Air Deflector Shield sensor, Media Bay Temp board and one integrated in each CPU assembly.

Jan 6, 2013 9:06 AM in response to japamac

If anyone reads this "Thread" in the future, This G5 PPC Quad works perfectly - Fans you can hardley hear - tick over all the time. (its the same as the others we have - except for that message)

When using FCP7 (30min film export to Compressor) the highest the Temp reads is 71c / 52c / 52c/ 62c for each core - and fans are at 70% power, have never got to flat out stage.

I stll don't understand when Calibration is done you get that Error message.

If anyone can shed more light - or even have a solution I would like to hear from you.

Pic attached is screen shot of G5 Quad in normal temp zone and fans are perfect. (about 10%)

PPC G5 Quad 2.5GHz Thermal Calibration