![]() ![]() We found something interesting while testing our current Western Digital drives. ![]() This results in four different ways you can plug that cable into the drive, but only one way that sends the right signal down the right wires. However, that temperature sensor cable has but two wires (one light and one dark) and only 6 pin sockets. Western Digital drives have an 8 pin connection for plugging the temperature sensor cable into. The second most common reason that the fans on the iMac go haywire is when replacing a Western Digital drive with another Western Digital drive. I installed a Western Digital drive exactly like the old drive and my fans are still going nuts! The LCD temperature sensor cable is located here on the motherboard: If the Optical Drive and/or CPU fan shows the fans spinning over 2,000rpm – then it is the LCD sensor cable that most likely isn’t fully seated. If the hard drive fan is spinning over 2,000rpm, chances are the cable isn’t fully seated at one end or the other (or you’ve installed a Western Digital drive – see the next section of the article). If your fans are each in the 1,000rpm range (give or take a couple hundred) everything is running normally. If you install the iStat widget you can determine easily which fans are running faster than normal and in turn, identify which sensor is giving you problems. The LCD sensor controls the optical and CPU fans. The hard drive sensor controls-you guessed it-the hard drive fan. The LCD sensor and the hard drive sensor control different fans inside the iMac. Luckily you don’t have to rip your iMac back apart to diagnose whether your LCD sensor is the problem. If that sensor does not get plugged back in during the re-assembly process, the iMac’s fans will run at high speeds even if the hard drive’s sensor cable is plugged in correctly. During the process of removing the iMac’s LCD to get at the hard drive, the LCD temperature sensor is removed from the logic board. The most popular reason for the spinning fans is that one of the temperature sensors was not seated fully (or at all) during re-assembly. ![]() So why are the fans in my iMac spinning wildly after my hard drive upgrade? We’re proud to announce that after some extensive testing with every current 3.5″ HDD we carry, the swapping of brand for brand is still 100% completely valid in those models. The CPU temperature will also stay in this healthy temperature range.ĭownload Macs Fan Control on the dev’s website, on github, or from my local mirror (v4.1.12).After seeing an uptick in reports of out of control fan speeds in 20 iMacs, we decided to revisit our suggestion of the same brand for brand swapping of the main hard drive in those models to verify that our information was still current. So since we need to make sure the PSU does not overheat and melt your display panels LED strips on the right side, we set the CPU fan speed in relation to the PSU temperature. I learned that Apple did decide to “cool” the PSU by blowing the CPUs hot air onto it. Set the CPU fan to be controlled by the PSU Primary temperature. This stuff is sitting in the middle of the iMac case. If your disk runs hotter, you’ll shorten its lifetime and jeopardize your data. 40☌ – 75☌ (this controls the right hand side of the iMac) The HDD fan is controlled by the HDD temperature. Here’s my settings: Set everything to manual ODD Fan is controlled by GPU Diode. So I decided to set up the fans manually, the Mac now runs much cooler and still it’s not too loud. Macs Fan Control indicated that the PSU was running on 70☌ and more, and something made a buzzing sound (like a wire dangling inside a fan, which was not the case). Yesterday I encountered a customers iMac which ran crazy hot on the backside. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |