2020. 2. 8. 12:52ㆍ카테고리 없음
HDE Macbook Replacement Internal Cooling Fan Heat Dissipation for 13' Apple Mac Pro Model A1278 Laptop 3.8 out of 5 stars 68. - CPU fan * May receive model KSB0505HB or UDQFZZH70DQU Compatibility: MacBook Pro 13' A1278 - MacBookPro5,5 Mid 2009: MB990LL/A (2.26 GHz Core 2 Duo). Free Mac apps that monitor CPU temperature and fan speeds are hard to find, but this one app does both in the cleanest way. Oct 06, 2011 Once the problem happens, I closed every programs (CPU idle at 99%) and the fan still at 100% after one hour later. The back of the iMac is cool. I reinstalled the Lion twice already. Nothing helped. When the fan goes 100%, iProStat and smcFanControl show that the CPU.
I have an iMac 27 late-2009, 3.06 Ghz, 8gb RAM, running OS 10.8.5, and all the hardware is original (no HD swap.). Here's the problem: it takes about an hour for the CPU fan to gradually speed up from the initial approx 1200 RPM to around 4000 RPM (which is quite noisy). Then, all I have to do is to put it to sleep for enough time to let the fans stop spinning (that's not even 5 seconds) and then wake it up to see the CPU fan at normal speeds.
And here it goes for another hour of gradual increase. See the screenshot of the iStats Menu, the graph shows the increase in the last hour, and the three previous increase/sleep patterns. The other two fans are just fine.
All of that time, the iMac is at idle, nothing running at all. My iMac isn't my main computer, so i kinda left the problem as it was, spending an hour or so every couple of months trying to solve the issue, but after these 5 years of fruitless efforts, I can't believe I haven't solve it yet! Even though I get answers a lot from forums, here's my first post in one of them (ever!), in hope it will help.
Here are the solutions I tried already: smcFanControl, HDD Fan Control, iStats Fan Rules. Nothing seems to be able to override the fan speeds control, nothing at all! I vacuumed the air input and output. And of course, I did the SMC reset. I try to remember all the other things I did, but it gets confusing after those years of diverse problem solving. I did many upgrades (and even downgrades) too but I doubt it has anything to do. Even though I never opened the iMac's case (I DID open the bottom latch to replace RAM memory at some point, comes to my mind.
But that's not the back case) I wonder if it has anything to do with some hardware that would just be misplaced at the factory of because of a shock while moving the computer around. Anyone has any idea? Anything I could try? Check your heatsink. Make sure the clamp did not break or come loose. Ive seen this happen in PC's. Although the heatsink looks like its on correctly if a clamp broke or is loose the heatsink will not touch the CPU correctly.
Hope this helps. That's more the kind of answer I looking for! See, I fear it's something related to the hardware, which would be weird since I never opened the case. But since nothing else seams to work, this is maybe where my answer is.
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But just before I crack open my iMac, I'd like to see if anyone ever had the same issue. I've read about folks with similar fan problems, that occurred after a hard drive swap and a bad reconnection of the temperature sensors. UPDATE: For some reason, the CPU fan sometimes stay put. Now it's been sitting aroudn 940 RPM (which is Apple's minimum speed limit) for an hour. I made a test to see if there was any sort of trigger that would send the fan on a crazy train. So I launched around 10 heavy applications (Photoshop, Lightroom, etc.) at the same time and it stayed there, right at 940 RPM.
Now I turn on SMCfanControl and start playing with settings. I manage to bring the CPU fan and the 2 others (HD and optical) to all sort of speeds without any problem. So SMCfanCOntrol CAN control the fan, but there is still some sort of trigger that sends it up hill.
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Anyone has an idea what that trigger could be? Sense would be that it would be related to CPU usage. None of these fan programs will help set a maximum speed, nor should they because increased heat and the inability for the fan to respond to it is not good for the computer components. I would say try running a few Flash videos on your mac and see if you encounter the increase (if you use youtube for this make sure that you are using the flash player not HTML5 and of course also make sure the plugin is running as of Mavericks, the plugins do not start automatically on many websites).
I have noticed that both with my Mac and my friends' Macs that whenever you let Flash player run the fan speed would gradually increase until it is running at or close to its maximum speed. None of these fan programs will help set a maximum speed, nor should they because increased heat and the inability for the fan to respond to it is not good for the computer components. I would say try running a few Flash videos on your mac and see if you encounter the increase (if you use youtube for this make sure that you are using the flash player not HTML5 and of course also make sure the plugin is running as of Mavericks, the plugins do not start automatically on many websites). I have noticed that both with my Mac and my friends' Macs that whenever you let Flash player run the fan speed would gradually increase until it is running at or close to its maximum speed.
MacBook Pro 13' Retina A1502. MacBookPro11,1 Late 2013: ME864LL/A (2.4 Core i5). MacBookPro11,1 Late 2013: ME866LL/A (2.6 Core i5).
MacBookPro11,1 Late 2013: ME866LL/A (2.8 Core i7). MacBookPro11,1 Mid 2014: MGX72LL/A (2.6 GHz Core i5). MacBookPro11,1 Mid 2014: MGX82LL/A (2.6 GHz Core i5). MacBookPro11,1 Mid 2014: MGX92LL/A (2.8 GHz Core i5). MacBookPro11,1 Mid 2014: MGX92LL/A (3.0 GHz Core i7). MacBookPro12,1 Early 2015: MF839LL/A (2.7 GHz Core i5). MacBookPro12,1 Early 2015: MF841LL/A (2.9 GHz Core i5).
MacBookPro12,1 Early 2015: MF843LL/A (3.1 GHz Core i7).