iMac 27" A1312 CPU fan replacement

Question

iMac Intel 27インチ EMC 2309/2374

iMac Intel 27インチ EMC 2309 (Late 2009, Core 2 Duo 3.06もしくは3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHzもしくは Core i7 2.8 GHz) ID iMac11,1

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Don @dch

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投稿日: 2019年1月10日

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iMac 27" A1312 CPU fan replacement

Has anyone done a CPU fan replacement (guide) on this model iMac?

Update:

a) SMC reset had no effect - so ordered ifixit fan. Fan arrived two days ago.

b) before starting MB removal to replace fan - today i plugged in the new one and started up machine - no CPU fan start.

c) plugged the new CPU fan into the DVD fan port - and the new fan works.

Conclusion: MB is not sending signal or power to start the CPU fan.

Help. Does anyone know of this circumstance or what a solution may be?

One solution is to run jumper from the DVD wires to the CPU fan wires or abondon cooling DVD in favour of CPU - again with jumper...

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Did you replace the hard drive? Why do you think the fan needs replacing?

mayer さんによる2019年1月10日

Mayer - Greetings!

I don't know that yet. But wanted to get some help getting to that part of the machine.

As i've mentioned - i removed the GPU card and heat sinks a couple days ago with success in recovery of display. However, after downloading macs fan control - i see that the cpu fan is not running and can not be controlled. The other two are fine.

It may be i loosened a connector when juggling the MB to get the GPU card out (two screws accessed from back only - man!).

First i will attempt SMC reset first.

Don さんによる2019年1月10日

I am wondering if the resistor associated with the CPU fan has failed. Where is it? Can it be tested? Can it be replaced?

Don さんによる2019年1月16日

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Did you replace the hard drive? Why do you think the fan needs replacing? — mayer
Mayer - Greetings!

I don't know that yet. But wanted to get some help getting to that part of the machine.

As i've mentioned - i removed the GPU card and heat sinks a couple days ago with success in recovery of display. However, after downloading macs fan control - i see that the cpu fan is not running and can not be controlled. The other two are fine.

It may be i loosened a connector when juggling the MB to get the GPU card out (two screws accessed from back only - man!).

First i will attempt SMC reset first. — Don
I am wondering if the resistor associated with the CPU fan has failed. Where is it? Can it be tested? Can it be replaced? — Don

Dan @danj 評価: 479.3千 Self employed contract worker 35 329 971 · Answer 1 · 2019-01-10T13:54:02-07:00

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Dan @danj

評価: 479.3千

Self employed contract worker

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329

971

投稿日: 2019年1月10日

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We don’t have a direct guide but this Video can get you their iMac Intel 27インチ EMC 2374のAMD Radeon HD 4850ビデオカードの交換

You’ll need to fully remove the logic board to gain access to the fan. Here’s the needed part CPU Fan - P/N 922-9151

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Thanks - did that on my EMC 2426 last weekend...removed the card with heat sinks and baked them (190C for 8 minutes). That was a success. However, in the process of juggling the MB i may have loosened the connector.

Don さんによる2019年1月10日

Did you clean and reapply the needed thermal paste for the GPU & thermal pads for the VRAM's? Don't use thermal paste on the VRAM's!! You need to use the pads Arctic Thermal Pads

Dan さんによる2019年1月10日

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iMac Intel 27インチ EMC 2309/2374

iMac 27" A1312 CPU fan replacement

Update (01/10/2019)

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