iMac Fan loud and 4SNS Error in dignostics
My Mid 2011 iMac fan starts to go loud after about 20-30 seconds of being on, and then after a period of time (5-10mins but varies) it shuts down. I am ok with opening up and doing some repairs myself inside the mac. I get the following error in Apple diagnostics.
4SNS/1/40000001: ICOC —114.06
The error is pointing to a System Sensor, Electrical circuit on CPU.
I have replaced the Heat Sink with a new one, including changing the temperature sensor for CPU, this has not fixed the issue.
I have downloaded fan control and limited the fan speed and been keeping an eye on temperatures, nothing really rises above 50 at the time of crash.
Tried PRAM/SMC resets etc, this does not help.
Any help would be really appreciated.
Update (11/30/2019)
Screenshot of istat menu readings. Interestingly the CPU core reading is not registered. Maybe this points to something?
Found them on the board, thanks
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