My Mac is Now a Glorified Fan

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iMac Intel 21.5" EMC 2544

모델 A1418 / Late 2012 / 2.7 & 2.9 GHz Core i5 또는 3.1 GHz Core i7 프로세서

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Kenneth Gornor @kennygee

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게시일: 2021년 8월 23일

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My Mac is Now a Glorified Fan

So, I tried to replace the RAM, hard drive, and CPU in my 2012 2544, and the only thing I haven’t tried swapping back into the thing is the original RAM, only because I know the sticks work, as I tested them in my laptop. On boot, the screen does nothing, and the fan just blasts air. Anyone have any idea what I should troubleshoot first?

The second LED on the motherboard does not come on upon powering it up. I have a feeling this means my power supply is dead, but I want to make sure nonetheless.

The plastic on the left side is messed up. Should I try and shave it down?

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If you press the power button and immediately start holding alt/option, after holding it for about 30 seconds, do you see a white screen with Macintosh HD (or your OS partition) selectable?

Andrew S 의 2021년 8월 24일

@kennygee - The corner edge does look a bit messed up. The short row of pins looks a bit mis-shaped as well.

If the plastic has been pushed down so its asking as a wedge then you will need to carefully remove the pile so the chip seats properly. You'll also want to make sure the pins are not misaligned as well.

While not in focus the GPU chip looks like it has too much TIM.

Less is more here! you'll need to clean off the TIM on both the CPU and GPU and use just enough to cover the metal heat spreader on the CPU and just the black silicon chip on the GPU as you don't want any TIM covering the Green carrier board. You may need to use an loadable spray can with 95% reagent grade isopropyl alcohol to clean off what's collected on the small SMD devices.

Dan 의 2021년 8월 26일

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If you press the power button and immediately start holding alt/option, after holding it for about 30 seconds, do you see a white screen with Macintosh HD (or your OS partition) selectable? — Andrew S
@kennygee - The corner edge does look a bit messed up. The short row of pins looks a bit mis-shaped as well.

If the plastic has been pushed down so its asking as a wedge then you will need to carefully remove the pile so the chip seats properly. You'll also want to make sure the pins are not misaligned as well.

While not in focus the GPU chip looks like it has too much TIM.

Less is more here! you'll need to clean off the TIM on both the CPU and GPU and use just enough to cover the metal heat spreader on the CPU and just the black silicon chip on the GPU as you don't want any TIM covering the Green carrier board. You may need to use an loadable spray can with 95% reagent grade isopropyl alcohol to clean off what's collected on the small SMD devices. — Dan

Dan @danj 평판: 479.9k Self employed contract worker 35 329 971 · Answer 1 · 2021-08-24T04:41:10-07:00

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Dan @danj

평판: 479.9k

Self employed contract worker

35

329

971

게시일: 2021년 8월 24일

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This sounds like an improperly seated CPU chip! Time to go back in and take the CPU off and inspect the socket pins as you may have damaged a few. I often find the spring tension is hard to deal with, often failing to get the CPU to seat properly and what you are seeing with the diagnostic LED’s will react this way when you have shorted the ground pins. Also review your TIM application. Make sure the TIM is strictly on the lid not having gotten on the the carrier and the SMD devices on it. You’ll need to carefully! Clean it off making sure you fully remove the TIM (and clearly use less)

The reason the fan is racing is the SMC logic is working (which also supports the power supply is fine). Here SMC is not seeing the sensors properly and will push the fan to the max and lower the CPU’s clocking to prevent you from damaging your system (CPU).

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iMac Intel 21.5" EMC 2544

My Mac is Now a Glorified Fan

Update (08/23/2021)

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