Missing resistor, SMC and/or temperature sensor failure iMac late 2013
got some trouble with my imac late 2013, as the fan is running high all time although there is no (obvious) reason.
Well to make long things short, I ran the Apple Hardware test, saying that there might me a problem with the SMC (ref.-Code PFM006).
I already tried to reset the SMC, but it didn't do the trick. Well, as iStat Pro does not show any temperature for the ambient temp sensor, I presume that there must be a problem with this sensor. I already searched on the internet but never found a proper solution for this model, although my suspicion seems to be legit.
So I opened up my imac and found two spots, which don't seem to be in good/original condition (this is where I should mention, that I bought this mac in used condition). I uploaded some pics, hope you guys are able to help me out.
I compared those pics to the iFixit Teardown for this model and found that there seems to be a missing resistor close to the network port (btw. is the chip, which is coloured in pink the SMC?)
Does anyone know the exact type of this resistor?
Additionally I am under the impression, someone already tried to fix the mac, as there seems to be an unusual solder joint/shortcut close to the backlight inverter. I also guess this joint should be replaced by the proper resistor.
Maybe there is someone out there having access to the scematic of this board and able to tell of which type this resistor is?
Thanks in advance, any help appreciated!
Btw.: Does anyone know where to get the schematics or the board view from?
Is this a good question?