My intel iMac's fans gets louder then usual

Question

iMac Intel 21.5" EMC 2428

Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

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Ruslan @u378

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Postado: 21 de fev de 2019

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My intel iMac's fans gets louder then usual

got mid 2011 21” imac, i disassembled it all (without removing heatsink), cleaned both fans and motherboard and installed everything back into case. Fans acting as usual on start, but then starts rotating faster, after 1 or 2 minutes. and even more faster and louder if im watching movie. If i close the movie - fans wont get back to normal silent speed(

Any guess? Thanks

sensors

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You'll need to monitor what sensor is getting hot so you can address the problem.

Install TG Pro then post the main window so we can see the sensors (often times you need to grow the windows a bit so all the sensors are seen) Adicionar imagens a uma pergunta já existente

21 de fev de 2019 por Dan

Have you changed your hard drive?

21 de fev de 2019 por mayer

yes i did, i put the new ssd drive, but i did the same thing 2-3 times before with 21" mac with success (yes i know about thermal sensor in 27" macs hdd).. And btw i put back an old HDD and... same thing: fans getting louder and louder...

21 de fev de 2019 por Ruslan

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You'll need to monitor what sensor is getting hot so you can address the problem.

Install TG Pro then post the main window so we can see the sensors (often times you need to grow the windows a bit so all the sensors are seen) Adicionar imagens a uma pergunta já existente — Dan
yes i did, i put the new ssd drive, but i did the same thing 2-3 times before with 21" mac with success (yes i know about thermal sensor in 27" macs hdd).. And btw i put back an old HDD and... same thing: fans getting louder and louder... — Ruslan

Dan @danj Rep: 479,1 mil Self employed contract worker 35 329 971 · Answer 1 · 2019-02-21T19:09:48-07:00

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Dan @danj

Rep: 479,1 mil

Self employed contract worker

35

329

971

Postado: 21 de fev de 2019

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If you haven’t installed the needed thermal sensor you’ll need to do that OWC In-line Digital Thermal Sensor for iMac 2011 Hard Drive Upgrade. Using fanControl software doesn’t really work that well and your system will not last as long.

Your system likely needs a bit of dusk cleaning after we see the TG Pro snapshot we can get into wants needed.

I don't see any issues with the thermal sensors. So SMC is encountering a different issue. I'm suspecting you damaged one of the ferrite beads (L5500 through L5531) near the sensor connectors on the logic board.

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just updated my question with the screenshot

24 de fev de 2019 por Ruslan

ferrite beads are fine, mb is fine, did a PRAM reset twice…(

TG Pro is working fine, but! its wont decrease fan speed when CPU isnt very busy anymore

im sad(((

26 de fev de 2019 por Ruslan

OK lets see if we can get a hint from diagnostics. Restart the system and press and hold the D key. Did an error pop? If it did what was the error code.

26 de fev de 2019 por Dan

Aaaand no diagnostics window. at all. :D long pressing D does nothing. just looong time classic gray screen and then it boots normally

28 de fev de 2019 por Ruslan

Do you have a USB keyboard? Give that a try.

28 de fev de 2019 por Dan

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