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Modello A1418 / Fine 2012 / Processore Core i5 da 2,7 e 2,9 GHz o Core i7 da 3,1 GHz

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Major issue Fan hyper loud, and slow graphic 4sns/1/c0000008:TC0p--124

Hello folks,

As said my iMac boot long, the fan is hyper loud and everything is slow!

After a exerted HardWare test it gave me that number:

4sns/1/c0000008:TC0p--124

Any recommandation ? Or even reparation guide and cost? :)

Thank you guys

#1edit

Screen Grab from TG Pro:

https://d3nevzfk7ii3be.cloudfront.net/ig...

https://d3nevzfk7ii3be.cloudfront.net/ig...

#2edit

I manually reduced the speed of the main fan, nothing seems to be overheating. But still Ultra slow

Here is the log from 3398RPM to 1470RPM

TG Pro Log.csv

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Evet though its a bit dated it still can give you a clue on what the error codes mean: CNET - How to invoke and interpret the Apple hardware tests.

So if we dissect your error: 4sns/1/c0000008:TC0p--124

  • 4SNS System sensor
  • T for temperature
  • C Central processor (CPU)

So we now have a diagnostic direction something in the CPU cooling is not working correctly. And you do here the fan going at full speed so the system is trying to lower the temp but unable to. So either the CPU fan or the heat sink is not working correctly here.

Lets try something that can give us a bit more here. Download this app: Temperature Gauge Pro. It should show you in more detail what the sensors & fans are upto. Post a screenshot for us to see in your question (go into edit mode or append an update to you question).

Update (10/03/2015)

You're at a crossroads here.

You may want to let Apple fix this as it could be a bad circuit on the logic board or the heat sink has a problem. If you decide to do this your self the newer 'Thin Series' iMacs are very different than the older models and you do need to be very careful in removing the display unit as you can easily damage it in the process.

Make sure you have the correct tools as outlined in the IFIXIT guide here: iMac Intel 21.5" EMC 2544 Display Replacement as well as this tool: iMac Opening Tool. You will need a new set or two of the adhesive strips as well.

At this point you'll need to open the system up and do an inspection of the fans cable is not damaged as it has the tach sensor within it. Are you up to it?

Follow this IFIXIT guide: iMac Intel 21.5" EMC 2544 Fan Replacement Jump to step 24 to compare with your fan cable connection.

Immagine iMac Opening Wheel

Prodotto

iMac Opening Wheel

$7.99

Immagine iMac Intel 21.5" EMC 2544 Display

Guida

Sostituzione Display nell'iMac Intel da 21,5" EMC 2544

Difficoltà:

Moderato

1 - 2 hours

Immagine iMac Intel 21.5" EMC 2544 Ventola

Guida

Sostituzione ventola iMac Intel 21.5" EMC 2544

Difficoltà:

Moderato

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6 Commenti:

Thank you for all the information, so i did install TG Pro, i put some link in my topic :)

da

Well it looks like you have a bad sensor which needs repair (bad fan?). It this system using the original HD? Or did you replace it? I would have preferred seeing the whole screen vs the menu pull down. In any case the temps look a bit high but not enough to worry about.

da

As to the systems speed - The way the SMC works when its in a sensor failure condition is to raise the fans speed as well as run the CPU in slow speed so the system doesn't over heat. So your reaction you are seeing here is what is expected.

da

Ok, well explained, then, i have to repair my sensor is that possible ? I couldn't find a proper guides on ifixit Guides, i might as well change the main fan maybe? Let me know on that, and thank you for sharing your knowledge!

da

Looking at your log its clear the Platform Controller Hub Die is running hot. Did you alter you system? Add a SSD or swap out the HD?

da

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