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A1418 / EMC 2833 / Late 2015 / 3.1 GHz Core i5 or 3.3GHz Core i7 Processor. Released October 13, 2015.

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Slow CPU and High Fan after SSD Upgrade

I installed a OWC Mercury Electra 6G SSD in this late 2015 21.5 iMac. Previously it had a 1TB Fusion drive. It boots fine but the CPU is maxed out with kernel_task consuming all of the processor, and the fan is running at max speed.

I should also mention that during the installation, the screen fell open and the LCD cable was damaged. I have ordered a new LCD cable, but in the meantime, the built-in display does not work at all. I am running it on an external display. Could this be the cause of the system freaking out?

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2 Soluções

The display cable carries other signals in this case the thermal sensors. So when you damaged the cable you disconnected the sensors as well. SMC is designed to go into save mode when it looses access to needed sensors.

So until you replace the cable this is the correct reaction from the system. Hopefully no further damage is present.

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Did this fix resolve the problem.

I had someone do a RAM and SSD upgrade, it ran fine afterwards but the screen fell out that night. Since the screen has been replaced, the fan doesn’t stop running at full speed and it takes 15 minutes to open Adobe Premiere etc….

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Did you replace the display cable when you replaced the display? I would recommend running diagnostics, holding the D key when you boot the system. You might want to install a more useful app like TG Pro see what its diagnostic services tell you.

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