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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

Apr 28, 2012 3:26 AM in response to japamac

Hey

We dont have a PC here - Its a Mac they need to work

Thermo calabration is essential - I am sure if it was your Apple - you would what it 100%

Apr 28, 2012 3:28 AM in response to Kentuckykid69

Kentuckykid69 wrote:

I just want to get to the bottom of this - Why does it not complete the programme (it did about 3 months ago)

I'd say something wrong with the SMU if resetting it didn't help. If you really, really want to get to the bottom of this, you have to educate yourself in three areas at least: open firmware programming (forth), to understand how the OF interacts with the PMU/SMU; electronics, to measure the fan related stuff using an oscilloscope - the front fan rpms would be easy to rig, ie. to see the real rpms and judge whether it's the smu driving the fans too fast or just getting the rpm values wrong somehow; PowerPC assembly language to get some understanding of the workings of the service diagnostics disc in order to see whether the content of the error message has any relation to real events.

Joking aside, there's loads of references to bugs in the ASD discs causing the error, and no solutions. I talked about these things some months back with a couple of service techs. They had never seen calibration fail on logic boards that weren't toast to begin with.

Japamac tells it like it is.

Apr 28, 2012 3:32 AM in response to Kentuckykid69

You also have to consider that these machines are getting rather long in the tooth. My personal opinion/experience is that the G5 generation wasn't built to last much longer than the warranty period. I'll use mine as long as it works, but probably wouldn't be *buying* another (getting one for free would be another story).

Apr 28, 2012 3:36 AM in response to Heikki Lindholm

Hey Heikki

Thank you for taking the time to write back

The main point is:

all my Mac's - have to be 100% spot on - I keep them all immculate, cases and running gear and just could not undertand why I get this message.

If ever you find out why - please drop me a note - I do want to find out why

Cheers my friend

May 18, 2012 2:42 AM in response to Kentuckykid69

SORTED

very simple & G5 Quad apparently did not need the calabration as tech guy ran Final Cut Pro 6 and really stressed the chips out to see results which passed with flying colours.

As you can see its just processed a 45min Final Cut Pro film with everything thrown at hit.

japamac

Level 7

24,400 points

May 18, 2012 3:31 AM in response to Kentuckykid69

very simple & G5 Quad apparently did not need the calabration

I replied:

Why does it not complete the programme (it did about 3 months ago)

By your description, No need to.

I just want to get to the bottom of this

Obsessing over nothing.

Glad that the "problem" is solved.....

May 18, 2012 11:15 AM in response to japamac

Hi Japamac

Thanks for the message - cheers

Jan 2, 2013 9:04 AM in response to Kentuckykid69