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Model A1419 / Late 2012 / 2.9 & 3.2 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac13,2

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I need help to locate where the smc chip is the logicboard.

I have an issue with fan spinning when the iMac is shutdown. SMC and PRAM reseting does not help. From the forum, someone have similar problem with bad smc component on his imac 21”. But as the logicboard design is different than the iMac 27”. Anyone got a boardview so that I can locate the smc part, so that I can take a look if there is some bad component and check it for contuinity?


The logicboard has a history of problems. There were a blown L4400 a 120 Ohm 3A fix inductor (ferrite bead) which I have replaced with new one. This fixed fan spinning while the iMac is on. Now the only problem is that it is on while the iMac is shutdown. Beside that the iMac have 2 defective ram slot. Not to mention a brokken glass screen. It is a problem child, but it works at least normally while it is on.

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Ответ на этот вопрос У меня та же проблема

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Hi Thien ,

did you manage to locate the SMC? That type of chip is it and did you succeed in replacing it ?

thanks in advance , ciao bart


@bart koens - This is not an SMC chip issue! The cable was inserted backwards!

If SMC was bad then TG Pro would not be able to gain access to the sensor data.


please expand which cable ?


@bart_be - The display cable which connects just above the damaged components in Thien Khanh Nguyen picture above.


I couldn't find a solution to the problem. The board works for a while and died in the end.

Dan - The LCD cable are designed and placed on the LCD in such a way that you cannot plug in the cable backwards. You need to bend the cable to be able to plug it in backwards and you will immediately see that is wrong.

The reason I was looking for the SMC chipset, was that someone in Louis Rossmann thread mentioned the problem above, with fan spinning while the iMac is off could be due to defective SMC chipset. I could not go further as the Motherboard died on me after a while.


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Lets make sure we don’t fix things that aren’t broken ;-}

First did you run diagnostics? Restart your system and press the D key

Reference: Mac startup key combinations. If your system fails to load diagnostics you’ll need to give TG Pro a try. Let us know what you get for an error and a snapshot of the main window of TG Pro with all of the sensors visible here for us to see Adding images to an existing question

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hi Dan, I tried Diagnotics severals times, but could not start it. So I have installed TG Pro and the sensors seems to works fine.


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Thien Khanh Nguyen будет вечно благодарен.
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