MP 1,1-5,1 MP 5,1 fans @ max - no cpu temp.

[bmoore262]

About a week ago I installed a 2nd hand logic board in my (3yr ) dead MP 5,1. Also I replaced the quad cpu with a 6 core ( X5690 ).
Was working great for a week then yesterday I started it up for 30 mins or so then shut it down. Starting it again later the fans were full bore and the cpu temp was missing from display. I have been monitoring the temps after the cpu upgrade.

I did all the usual resets pram etc. I took the heat sink off the cpu to check the thermal paste and I noticed the two wires (for the temp sensor) where they connect to the heat sink were covered with thermal paste (adjacent to where it sits on the cpu).

Is there a procedure to 'unplug' these two wires so I can clean and reset them? I'm not sure how they are removed.

 

[Fastsavage]

Hi there,

This post might help...

Mac Pro 4,1 high fan speed, Heatsink temp sensor issue?

Hi all I have a Mac Pro 4,1 flashed to 5,1 with 2x X5680s installed I have an intermittent problem where some of the fan speeds in machine will go to 100%, even at idle, which is incredibly noisy, I believe I have diagnosed the issue as being with the heatsink temp sensor for CPU A, in the...

forums.macrumors.com

 

[bmoore262]

Thanks for that. I have seen that post before. The 4,1 is slightly different to the 5,1 heat sink set up. There is a noticeable screw in that pic (4,1 ) which looks like an attachment point. The screw in mine seems much smaller. I'm not sure if that will detach the two cables, so I was posting to see if anyone had done it before. In the above post I'm not exactly sure what he means when he says to 'exchange the heatsinks' ie take them apart.

Probably not what I need to do as I just want to detach the cables ( if that is possible ). The image below is a 4,1.

 

[KeesMacPro]

Hi, bmoore

the cpu temp was missing from display.

Which one was missing i.e. CPU heatsink/diode ?

Is there a procedure to 'unplug' these two wires so I can clean and reset them? I'm not sure how they are removed.

These wires are not supposed to be removed.

What do you mean by "reset them" ?

You can clean them with alcohol or isopropyl and look for damages to the cable.

what I need to do as I just want to detach the cables ( if that is possible )

Why do you want to detach the cables?

 

[bmoore262]

Hi - thanks for replying.

(QUOTE) Which one was missing i.e. CPU heatsink/diode ?

All cpu temp info is missing ( also an ssd which is plugged into a pcie slot). My other temps seem to display and are acceptable using TG pro.

(QUOTE) What do you mean by "reset them" ?

I meant disconnect them and clean the remaining thermal paste from the ends and then reconnect the cables.

(QUOTE) Why do you want to detach the cables?

The idea was to be able to properly clean the ends of these cables ( heat sink end ) as I used alcohol to clean as much as I could, though there was some remaining underneath where they connect.

I suspected they were fixed to the heat sink and not removable so that is why I posted to see if anyone had done this etc. I don't know if this was the problem for my fans running at high speed and no cpu temp info.

 

[KeesMacPro]

Your welcome!

To get/keep an overview for the reader to this topic, I recommend to either add a signature with all hardware details or post a list of all hardware installed, OS version, BootROM etc etc.

Concerning Temp reading, not sure what you meant so please post a screenshot of TG Pro and all will be clear.
There are 2 cables routed from the CPU connector to the Temp sensor on the heatsink.
These cables are soldered to the sensor and are not supposed to be removed.
They are covered with heatshrink tube and the possibility that thermal paste will enter is very very small.
Besides lots of thermal pastes are not electrically conductive.
Which brand/type did you use?

 

[bmoore262]

Hello - MP mid 2012.

Hardware Overview:

Model Name: Mac Pro
Model Identifier: MacPro5,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 3.2 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 8 MB
Hyper-Threading Technology: Enabled
Memory: 8 GB
Boot ROM Version: 144.0.0.0.0
SMC Version (system): 1.39f11
SMC Version (processor tray): 1.39f11
Serial Number (system):
Serial Number (processor tray):
Hardware UUID:

Today I upgraded to Mojave though my 'problems' remain.
I used Artic silver Ceramique2 thermal compound. I thought thermal paste was conductive (?).
I also thought the cables were sealed and access for the paste unlikely.

So yeah - not sure what caused the change in fan behaviour.

In this snapshot it says all sensors appear to be working, though that changes to cpu,hard drive not working.

I have the fans set at 1000rpm with mac fan control. So when I boot the computer the fans are racing until the programs load and they revert to 1K rpm. When I shut down the fans race again till the computer stops.

 

[KeesMacPro]

Thx for the update !

1st of all , I'd recommend to remove the serial number from your post.

Notes/questions to the following oddities:

1 ) there's no CPU Temp reading : no CPU diode, no CPU heatsink, no CPU core

2 ) there's no CPU Boost A fan reading

3 ) "hard drive not shown" is possible with TG Pro as it only shows SATA drives (not NVMe blades in PCIe slots).

4 ) sounds like you installed MacsFanControl and TG Pro. Make 100 % sure you're NOT running both at the same time.
Personally I'd uninstall either one of them and do a triple NVRAM + SMC reset.

5 ) all fans are racing without manual interference , is very likely caused by failing CPU Temps reading and CPU fan missing.

6 ) Are all RAM sticks recognized by the system?

7) your post shows a quadcore CPU , not a 6-core X5690 , which one is this?

8 ) are there any red lights on the CPU board when booted?

So in summary not only all CPU Temps are missing, but also the CPU fan is missing.
CPU heatsink (obviously) and CPU Boost A fan could be caused by a failing/not properly seated connector on the heatsink.
Remains a mystery to me why there's no CPU reading at all .

 

[bmoore262]

Thanks again.

Ok - I now only have MacsFanControl installed. Did a triple nvram reset.

* All ram is recognized ( 4x2gb )

* Cpu fan appears to be working through observation.

* I put my original quad W3565 cpu back in a couple of days ago to see if that would do anything.The interesting thing is that it boots quicker than the X5690 6 core. Though the 6 core works fine after a longer boot time.

* There is a red light permanently on ( the one that I believe is meant to only briefly illuminate at start up ) on the processor tray.

At one point about two days ago while trouble shooting this ,some cpu info became available on TG Pro and MacsFanControl saying cpu temps ( or temp) was OK ( giving a temp ). When I started the computer up the next day it reverted to no cpu info.

I'm suspecting the cpu temps are actually OK but I am just not seeing them. The computer runs fine with the fans @ 1K rpm courtesy of MacsFanControl. I would like to sort this out though. Previously when my fans were normal they just used to idle at around 600rpm which made for a quiet computer though higher temps than I have now.

This is latest screenshot.

 

[Fastsavage]

Thanks again.

Ok - I now only have MacsFanControl installed. Did a triple nvram reset.

* All ram is recognized ( 4x2gb )

* Cpu fan appears to be working through observation.

* I put my original quad W3565 cpu back in a couple of days ago to see if that would do anything.The interesting thing is that it boots quicker than the X5690 6 core. Though the 6 core works fine after a longer boot time.

* There is a red light permanently on ( the one that I believe is meant to only briefly illuminate at start up ) on the processor tray.

At one point about two days ago while trouble shooting this ,some cpu info became available on TG Pro and MacsFanControl saying cpu temps ( or temp) was OK ( giving a temp ). When I started the computer up the next day it reverted to no cpu info.

I'm suspecting the cpu temps are actually OK but I am just not seeing them. The computer runs fine with the fans @ 1K rpm courtesy of MacsFanControl. I would like to sort this out though. Previously when my fans were normal they just used to idle at around 600rpm which made for a quiet computer though higher temps than I have now.

This is latest screenshot.

View attachment 1938871

Hi there

Regarding fan speeds. There are lots of different opinions about speeds and temps

Biggest thing I learnt from these forums was to keep BOOSTA on “Auto”. That way your cpu (hopefully) should never get too hot

 

[bmoore262]

Thanks for letting me know - I'll try that.

 

[KeesMacPro]

Thanks again.

Ok - I now only have MacsFanControl installed. Did a triple nvram reset.

* All ram is recognized ( 4x2gb )

* Cpu fan appears to be working through observation.

* I put my original quad W3565 cpu back in a couple of days ago to see if that would do anything.The interesting thing is that it boots quicker than the X5690 6 core. Though the 6 core works fine after a longer boot time.

* There is a red light permanently on ( the one that I believe is meant to only briefly illuminate at start up ) on the processor tray.

At one point about two days ago while trouble shooting this ,some cpu info became available on TG Pro and MacsFanControl saying cpu temps ( or temp) was OK ( giving a temp ). When I started the computer up the next day it reverted to no cpu info.

I'm suspecting the cpu temps are actually OK but I am just not seeing them. The computer runs fine with the fans @ 1K rpm courtesy of MacsFanControl. I would like to sort this out though. Previously when my fans were normal they just used to idle at around 600rpm which made for a quiet computer though higher temps than I have now.

This is latest screenshot.

- Good that the RAM is recognized , but its Temp reading is missing in MFC ....
- CPU fan works , but still no CPU Temps reading
- A X5690 should boot as fast as the W3565
- there are different red lights on the CPU board , I attached the Technician Guide for troubleshooting
- never seen any message about CPU T , so not sure what that means
- the suspect that the CPU T is OK , is not based on any data shown so could be yes or no .
All Temps of all components should be visible under all circumstances , regardless OK or not.

The situation is that there are many T readings still missing ( 3x CPU , 4x DIMM and 1 x Samsung drive) and fans run at full rpm without interference.
All clear signs that something's very wrong with this Mac Pro (not just a thermal sensor issue in the heatsink).
I attached a link to download the Technician Guide , so you can start troubleshooting methodically (MP 2010 is same as MP 2012).

https://tim.id.au/laptops/apple/macpro/macpro_mid2010.pdf

 

[Macschrauber]

7 degrees Delta for the Northbridge is also strange.

is there some spoofing with OpenCore?

maybe spoofing went nuts.

what also comes in my mind: what if the sensors table (basexx) in Fsys of the Mac firmware is damaged.

You could make a rom dump and check it wih uefiTool.

I made a tool for it

Dropbox - File Deleted - Simplify your life

www.dropbox.com

 

[bmoore262]

7 degrees Delta for the Northbridge is also strange.

is there some spoofing wirh OpenCore?

maybe spoofing went nuts.

No - not at all. No skulduggery on my part. Everything as apple designed it.

I'll have to look into how to make a rom dump. I downloaded your file - thanks.