[G5] G5 June 2004 dual 2.0 Processor problem

[Andrew J. Yon III]

Eric,
Sorry for the long time in getting back to you but I have been out of  
town for a while. Also, today is mine an my wife's 37th anniversary. I  
believe for our generation, it may be an all time record, LOL.

You hit the nail on the head . Your very astute observation, on the  
memory controller temps and its heat sink, got me to digging. I found  
it after having completely dismantling the G5. It is located on the  
back side of the Logic board / motherboard. it is held onto the logic  
board by 2 plastic push thru pins that kind of lock in place by  
grooves in the pins. Both pins were not locked into place and the heat  
sink was away from the controlled chip a fraction. Also, the thermal  
past had hardened by the heat build up as a result. Luckily, I was  
able to clean and replace the old thermal paste. The G5 is now rock  
solid running all of my many apps including the entire adobe suite and  
a host of other intensive apps at one time.


Many thanks to all who responded, but Eric gets the Gold Star award.


Again Eric, Many Thanks.


Andy3


On Sep 26, 2008, at 9:02 AM, Eric Volker wrote:

>
> On Sep 25, 2008, at 7:54 PM, Andrew J. Yon III wrote:
>> Eric,
>>
>> First off no offense was taken. Don't worry, I have been informed  
>> by Doctor friends of mine , that as we age , that happenings like  
>> that will increase more and more as we age.  : )     I, now, feel  
>> blessed if I can remember my own name, LOL.
>>
>> Thank you for the external link to that site. I had not run across  
>> that site before. He does mention similar crashes, but due to the  
>> keywords, "take apart", I had not seen that page. I have the Apple  
>> Service Source Manuals and had not searched for any manuals due to  
>> that.  After having seen his photos of the power supply, even tho  
>> mine has always lived in a clean lab environment and is  
>> immaculately clean, I am resolved to taking this one apart for a  
>> better look see. I will update you on what I find.
>>
>> Yes, I had noticed the temperature reading on the  memory  
>> controller and had installed two standard pc type fans to the front  
>> of the case in the lower quadrant of the front panel that use an  
>> external power source. I noted that all fan RPMS ran at 300 rpms  
>> constant, with those two running full time. However the G5 still  
>> crashed at random anyway, whether idle or under critical load.
>>
>> I also tried the fans on the rear of the G5, outside, located over  
>> the top of the existing fans. The result was a longer duration  
>> between the crashes, but still crashing at random.
>>
>> I, too, am wanting to know where that heatsink is located.
>>
>>
>> Andy3
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>
>
> I'm also very curious about the location of that heatsink. I would  
> think that something like that would be covered in the Apple Service  
> Manuals.
>
> Did you mount the fans on the *inside* or outside of the G5's case?  
> I've seen at least one picture of someone mounting an 80mm fan on  
> the inside of the case near the memory housing (where I'd presume  
> such a heatsink would live.)
>
> I would also suggest that you post your problem and what you've  
> learned to the G3-5 list. There are many experts on the list (moreso  
> than myself) who might know exactly where that heatsink is. Good  
> luck on taking it apart...
>
> Eric
>
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