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Hi – I have a 2015 iMac which I have replaced the thermal compound for, turning it back on I note that the hottest part of the system is the sensor ‘Back light controller proximity temperature’ which is at 48C at idle. I am afraid to push it. Does anyone have any idea where this sensor is located? Along with the CPU and GPU compound I have just replaced the thermal pads on the VRAM and am concerned these new pads may not be performing as needed. Here are my current temps:

As far if temps are, 50C isnt bad. For cpus if you get 60C thats great any more and thats a bit on the hot side. Also have you tried other programs that might give you different results? Ive had a program tell me some absurdly low voltages for my psu but it was wrong so try a few different programs and then see if the numbers match up. But 50C is only 122F which isnt horrible