Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

Smookie

macrumors newbie
Original poster
Oct 13, 2013
1
0
Hello. I have purchased iMac 27 2010 and made a total cleaning inside because I think there was dust inside from 2010. I also replaced optical drive with SSD. Device turned on and vents are working on 100% right after I press the start button. No system installed. I also do not insert the OPP temperature sensor cause I found it hard to remove sensor from the optical drive. What could cause this issue? Some damaged sensor? Badly plugged?
 

Juicy Box

macrumors 604
Sep 23, 2014
7,534
8,865
Where is your OS located? On the original HDD?

Disregard this post. This was intended for a different thread.
 
Last edited:

Juicy Box

macrumors 604
Sep 23, 2014
7,534
8,865
IIRC, the 2010 iMacs will go into limp mode and run fans at full speed if the temperature sensors are removed.

There isn't an external sensor for the HDD, but one internally. So, if the HDD is replaced with a SSD, the sensor circuit will be open, basically showing an failure in the sensor. With no temperature information given to the OS, the fans will run at full speed to protect the hardware.

I would assume that the optical drive temperature sensor would behave the same way.

There are adapters to get to prevent this. You can also use a software solution to control the fan speeds, there are some free ones out there. I use one on my 17" MBP just to keep it cooler than the OS would normally keep it due to that particular model having GPU related failures.

I haven't tried it, but I have heard that if you just jump the leads of the sensor connector, basically closing or shorting the circuit, this will get the fans back to normal and will not lead to any problems.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.