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imac 2011 27" CPU permanenttly works on half of frequency

According to this post:
https://www.ifixit.com/Answers/View...ans+after+Dual+Drive+Kit+Upgrade#answer335650
And this photo
yCAJAKwDD1tc1Rtw.standard


I decided to check the same place on my imac. And that what I saw:
UNADJUSTEDNONRAW_thumb_3.jpg


before_big.jpg


So I took soldering-iron and tried to fix it by connection circuits lanes:
after_big.png


I it works! Now CPU work as it should - on 3,2GHz at the load at CPU\GPU fans works properly
Screen_Shot_2016_11_11_at_00_39_46.png


Thanks everyone for you help

P.S. I still have problems with HDD fan, because I use not an apple hard disk. But it's ok, rmp full controls by Macs Fan Control software tool
 
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It helps me, but not for a long time. At next day the problem came back. It still a permanet 1,6ghz clock speed :( Maybe problem in a poor quality of soldering.
 
I have this problem too
before
tXSqtiNg6tc.jpg

after
LWmZ9WNAK3A.jpg


scheme
r9IXWrNPxD8.jpg


It works on a half of clock speed
What would you recommend? to resolder or solder a ferrite
 
Hi everyone!
I have the same problem with the L5500 and L5501 ferrites. I took soldering-iron and connected the both circuits too, but now instead a TA0P error I've got TS2P error. Fan still faster and CPU clock remains at 1.6ghz. Could someone help me with that?

Thanks a lot!
 
I too also have this same issue. I took my board out to replace the gpu and one of these little ferrite pos fell off. Seems like it was designed to do that!
I just ordered a replacement board. Not sure how you guys are so talented at soldering you can connect that. I can barely see it let alone can figure out the right combination of tools to get it to work.
If someone wants to give it a try I will ship my board out to you, Send me a message with your info.


Thank you
 
Hello everyone!

I'm facing a serious issue with my iMac 27" from 2011 and can't seem to find a solution. Here are the main problems:

- All fans are running at maximum speed.

- The CPU is throttled to 1.7 GHz.

- The GPU is running at only 20% of its capacity.

- After waking up from sleep mode, everything works normally for about 10 seconds, but then the problems come back.


Here’s what I’ve already done:

- Replaced the CPU (with an i7).

- Replaced the logic board.

- Installed new RAM.

- Replaced the SSD (from a Samsung 840 EVO 500GB to a Samsung 870 EVO 1TB).

- Installed a special temperature sensor for the SSD.

- Reinstalled macOS High Sierra.

- Reset NVRAM/PRAM and SMC multiple times.

I’m using *Macs Fan Control* and *Intel Power Gadget* for monitoring, but nothing changes: the CPU stays at 1.7 GHz even under load, and the GPU runs at minimal capacity.

Has anyone encountered a similar issue or has suggestions on what else I can try? I would really appreciate any advice or help! Thank you!
Снимок экрана 2024-09-11 в 14.13.28.png
IMG_9679.PNG
Снимок экрана 2024-09-11 в 14.15.19.png
 
I don't know if it helps, when I did my 2011 27" I left the HDD in and fitted the SSD to the spare board connector, I also left the optical drive in place. Fan speeds were fine. I imaged the HDD to SSD and the HDD was fitted but never had anything on it. Months later the HDD failed so I removed it and after this the fans cranked full speed. Some web searching turned two pins could be linked on the cable that was on the HDD and all was well again. Bit rusty on detail and not at home to check but if this is your situation may be a help.
 
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slimgym said:
I don't know if it helps, when I did my 2011 27" I left the HDD in and fitted the SSD to the spare board connector, I also left the optical drive in place. Fan speeds were fine. I imaged the HDD to SSD and the HDD was fitted but never had anything on it. Months later the HDD failed so I removed it and after this the fans cranked full speed. Some web searching turned two pins could be linked on the cable that was on the HDD and all was well again. Bit rusty on detail and not at home to check but if this is your situation may be a help.
Click to expand...
I installed a new temperature sensor for the SSD two days ago, but unfortunately, it didn’t make any difference.
2024-09-11 19.33.08.jpg
 
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Significant1 said:
I guess according to iFixit, but in my late 2009 I just used a temperature sensitive resistor I was send from a technician and plugged the legs directly into the plug. It worked fine.
Click to expand...
Is this method with the temperature-sensitive resistor an alternative to the SSD temperature sensor shown in the photo above? Could this be used to replace the standard sensor in my situation with the iMac?
 
GidroGen said:
Is this method with the temperature-sensitive resistor an alternative to the SSD temperature sensor shown in the photo above? Could this be used to replace the standard sensor in my situation with the iMac?
Click to expand...
Yes. Not sure what you mean by standard sensor. I did the upgrade back in 2011 og 2012, so my memory is sketchy, but as fare as i can recall, the built in harddrive was Apple branded with Apple firmware which transmitted temperature to pins on the harddrive, where this temperature cable was connected. Until I recieved the resistor I just short circuit it, and that also worked fine, but of course cheat the system and never speed up the fans if needed.
 
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GidroGen said:
I installed a new temperature sensor for the SSD two days ago, but unfortunately, it didn’t make any difference.View attachment 2415979
Click to expand...
As everyone else the memory is sketchy. Did you install the SSD to its own dedicated connector on the main board (and also have the HDD connected) or did you connect the SSD to the HDD port and remove the HDD?

I had the SSD on its dedicated port as well as the HDD, all was fine until the HDD failed so I removed it then the fans cranked full speed. Evidently apple branded drives send temperature info within HDD data, it needs a drive with their firmware at their price. As I did not need the HDD I did not want to spend on it. That's when I discovered connecting two pins on the end of the HDD cable put it all back to normal.

As I say this is a while back but if you have the above situation I can do some more digging when home see if I can hunt out the info for you. I couldn't just simply unplug the HDD or replace with another brand as the fans cranked.


I think it's this mod.
 
Last edited:
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I had a 2019 that operated at 10% of its frequency. Just replace the cpu with the same model and it will be fine, assuming its socketed like mine was. Apple would not be interested anymore its too old.
 
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GidroGen said:
Hello everyone!

I'm facing a serious issue with my iMac 27" from 2011 and can't seem to find a solution. Here are the main problems:

- All fans are running at maximum speed.

- The CPU is throttled to 1.7 GHz.

- The GPU is running at only 20% of its capacity.

- After waking up from sleep mode, everything works normally for about 10 seconds, but then the problems come back.


Here’s what I’ve already done:

- Replaced the CPU (with an i7).

- Replaced the logic board.

- Installed new RAM.

- Replaced the SSD (from a Samsung 840 EVO 500GB to a Samsung 870 EVO 1TB).

- Installed a special temperature sensor for the SSD.

- Reinstalled macOS High Sierra.

- Reset NVRAM/PRAM and SMC multiple times.

I’m using *Macs Fan Control* and *Intel Power Gadget* for monitoring, but nothing changes: the CPU stays at 1.7 GHz even under load, and the GPU runs at minimal capacity.

Has anyone encountered a similar issue or has suggestions on what else I can try? I would really appreciate any advice or help! Thank you!
View attachment 2415807View attachment 2415808View attachment 2415809
Click to expand...

Something is wrong with your HHD fan or logic board:

1726245953816.png


This is not a sensor issue. Maybe you damaged something on your logic board?
 
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Noot said:
Something is wrong with your HHD fan or logic board:

View attachment 2417388

This is not a sensor issue. Maybe you damaged something on your logic board?
Click to expand...
I apologize for the delayed response. I intentionally disconnected it because it makes an unpleasant noise, even at minimal speeds. I had it connected before, but it didn’t solve the problem.
 
slimgym said:
As everyone else the memory is sketchy. Did you install the SSD to its own dedicated connector on the main board (and also have the HDD connected) or did you connect the SSD to the HDD port and remove the HDD?

I had the SSD on its dedicated port as well as the HDD, all was fine until the HDD failed so I removed it then the fans cranked full speed. Evidently apple branded drives send temperature info within HDD data, it needs a drive with their firmware at their price. As I did not need the HDD I did not want to spend on it. That's when I discovered connecting two pins on the end of the HDD cable put it all back to normal.

As I say this is a while back but if you have the above situation I can do some more digging when home see if I can hunt out the info for you. I couldn't just simply unplug the HDD or replace with another brand as the fans cranked.


I think it's this mod.
Click to expand...
Is cutting the wire an alternative to the temperature sensor I purchased for the SSD?
 
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