This repair video, however, was incredibly thorough, and made me confident that I could do this myself.
That logic board is an amazing display of infuriating design. I’ve had experience taking apart complicated computers before (particularly the original iMacs way back in the late 90s), but this iMac is by far the most ridiculous. Just wanted to add my thanks for this wonderfully meticulous video. Best wishes to you and your twice-baked iMac! I also use smcfancontrol to keep the fan speed higher than stock. But as I said, I’ve gotten about 15 months on my 2nd bake, and that is with daily use of the machine, including GPU intensive games by my son. Not sure if my first bake lasted because I didn’t clean off the old Apple pads on the memory chips, or if the GPU simply needed two bakes to finally come back to life.
#Smcfancontrol funktioniert nicht pro
After my 2nd bake I did a thorough cleaning of all the thermal paste material, and then I used freshly opened and new K4 Pro on the GPU and K5 Pro on the memory chips (which is a thick paste that acts as a replacement for thermal pads). But again, I didn’t clean off the old thermal pads that were on the memory chips and just applied that non-conductive paste over the remaining pads. I used an old tube of Arctic Silver V on the GPU and an old, generic, previously unopened, non-conductive paste on the memory chips. You just need to be methodical and organised, and don’t be put off by the depth of deconstruction/reconstruction - it’s a perfectly surmountable task! In fact, it would have been difficult to have done it any other way.Īlthough marked ‘difficult’, I think it’s more ‘involved’ than hard to do. It was possible to remove just the video card and heat sink by removing the 2 torx screws that fix it to the motherboard and a single torx screw at the other end of the heat sink. I also didn’t need to remove the entire heat sink mounting assembly from the mother board.
#Smcfancontrol funktioniert nicht mac
The ambient light sensor was very easy to remove on my Mac - lucky me! Ultimately there were slightly fewer than on James’s machine, but the video gives all the info you need to figure it out. Some of the motherboard connectors are slightly different in the 2011 iMac. I used it to bake the GPU on my mid-2011 iMac when the vertical green lines appeared and it failed to start up. Apple replaced my card 3 years after I had purchased my Mac due to the video card fault, but 3 years later it had the same problem, which is why used the bake. (I have a late 2015 edition 27" 5K iMac at the office and it's very well made - never had a problem with it - and it runs cool too.) So even if you "replace" your video card, the same problem will occur 3 or so years down the line. So we either do the bake resurrection trick or get rid of the Mac and buy a 2015 or later edition. It would be nice if we could just swap it out for a different card, but the cards that don't appear to have the same fault won't physically fit in the iMac. In almost every case the culprit is that silly video card. Sometimes there are no screen anomalies but the machine just freezes. I've read many different reports from people who say their Mac exhibited different things on screen, either artifacts, or totally white or totally black, and sometimes with vertical or horizontal lines.
This repair guide was a life saver for me. Long story short, once I got the system back together and started it up I had video again. I took my time and worked through the video several times. In doing some more research I came across this repair guide by James and decided to give it a try as I really had nothing to lose. All my research pointed to the video card being the issue. In Googling the issue I found that it is a common issue with the late 2009 iMac with the AMD Radeon HD 4850. The iMac was still running in the background but the screen was blank. Finally, even with a restart the screen would remain black. Then the screen started blinking black and would finally stay black and I would need to do a hard reset to get the iMac working again. As time when on this started happening more often. About six months ago my iMac would occasionally not wake up from sleep mode and I'd have to do a hard reset. I've got a late 2009 27" iMac with the AMD Radeon HD 4850.
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