Faulty CPU/ODD sensors or fans after Dual Drive Kit Upgrade
I performed the Dual Hard Drive Kit upgrade as suggested in the guide at Installing iMac Intel 27" EMC 2429 Dual Drive Kit (HDD or SSD)
I followed the steps precisely during the whole process.
After the second drive (SSD) was installed, I booted up the iMac and heard loud fan noise after a few seconds. Both CPU and ODD fans are running at full speed.
I have tried resetting SMC/PRAM, but to no avail. I reassembled the logic board twice, with and without the Dual Drive Kit upgrade. It still didn't fix the problem.
So, I believe something somewhere has gone wrong and I need to identify the problem and fix it.
I have also noticed that it is not just the fans that are loud, my game which I play every day at 30fps, is crawling at 6-7fps after the upgrade (still utilizing the HDD though, not the SSD).
Running the Apple Hardware Test revealed failure with TA0P code, which indicates Ambient Temperature sensor/connector failure according to some google search results.
Moreover, Temperature Gauge Pro app reports the following:
ODD 3729 RPM
HDD 1097 RPM
CPU 3917 RPM
Fan Diagnostics: These fans appear to be not working properly : ODD
Sensor Diagnostics: These sensors appear to be not working properly : CPU
Some further Googling has revealed that this person had a similar problem and flipping the LCD Thermal Sensor Cable fixed it for him: http://forums.macrumors.com/showpost.php...
However, I'm not sure which of the cables mentioned in the iFixit guide are the LCD Thermal Sensor Cable, for me to give it a go (I doubt any of the cables can be flipped on this model though).
Any help would be appreciated.
- After installing 2nd drive (SSD) on 2011 27'' iMac,
- CPU and ODD fans are running at full speed, HDD fan at normal.
- Degraded gaming performance at 6-7fps.
- Failure in Apple Hardware Test with code TA0p.
- Something somewhere went wrong in assembling/disassembling (perhaps).
I removed the LCD panel from the iMac and booted it with external Cinema Display. The fans are still loud. So I doubt that the problem is with LCD sensor. Maybe I should pay attention to the Ambient Sensor/connector, since the AHT failure also reported a fault with that.
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