![]() ![]() IFixit has some clear pictures and instructions on how to take apart the Intel iMac 2006 that I used. This way, the iMac can’t overheat without the cooling fans getting uncomfortably loud. He uses SMC Fan Control to set the speed of the central fan to maximum and leave the fans for the hard disk and optical drives as low as they are per default. ![]() According to youtube user ‘casualtechs’ aka Mark Sicat, anything above 31✬ indicates a problem. Not surprisingly, around that temperature the computer becomes unstable. Within minutes it heats up to around 100✬, especially if you let it work a bit, for example by playing a video. The 17 and 20 inch models have a GPU soldered to the logic board, an ATY Radeon X1600 in this case.Īfter waking the iMac up, the GPU temperature immediately goes up very fast. All sensors indicated normal temperatures, except the one for the video card, or rather: GPU, because only the 24 inch model has a separate video board. I decided to first put the iMac back together so I could measure the temperature sensors with Hardware Monitor. I even found a video demonstrating a method first to resolder the pins of the GPU. Someone suspected the thermal conductor to be leaking. I found several cases in which the thermal compound needed to be refreshed. The bottom left fan had some dust on it, so I cleaned it, but heat sink ‘air tunnel’ on the top was as clean as a whistle. This could not have caused the problem.Ī problem with the heat sink is more likely. I carefully opened up the iMac and inspected two of the fans. SMC Fan Control is often used to keep the fans at a higher speed, to prevent heat problems. These kind of video problems are typical for iMacs from that period and are usually caused by heat problems and of course sometimes by bad hardware. I ran Mactracker to determine the exact model of iMac. Still, I did some research about this particular Mac model. The iMac was 7,5 years old then. Now it’s 8,5 years and it crashes more often and sooner then a year ago, so I decided to try and find out whether I can fix the problem myself.Īt first I was sceptical about overheating being the problem, because I didn’t even hear the fans and you’d think that they would at least rev up. My parents 20 inch first generation Intel iMac from early 2006 (A1174) began to show strangely garbled video on random parts of the screen, after a few minutes followed by a ‘frozen’ screen or spontaneous restart few minutes later.Īt first these glitches happend only on warm days. ![]()
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