简介
更换或升级 CPU。在重新组装 iMac 之前,不要忘记涂上一层新的导热膏。
请按照我们的 散热膏指南 了解有关清洁和准备散热表面以及在 CPU 和 GPU 模具上涂抹一层新的散热膏的说明。
在开始对 iMac 进行任何操作之前:拔下电脑电源插头,按住电源按钮 10 秒钟,对电源电容器放电。
请勿触摸电源背面的电容器引线或任何裸露的焊点。只能用手触摸电路板的边缘。
你所需要的
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在这个步骤中使用的工具:iMac Intel 27" Cardboard Service Wedge$4.99
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如果铰链可以自由移动,iMac就会失去平衡,难以开展工作。修理时可以让iMac躺下,但使用iMac维修楔子会更快更容易。
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如果你使用的是 iFixit纸板服务楔子,请按照 装配说明将其组装起来。
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要重新组装您的设备,请反向遵循这些说明,并使用我们的粘合剂指南重新装上显示屏玻璃。
将您的电子垃圾送到R2 或 e-Stewards 认证的回收商。
要重新组装您的设备,请反向遵循这些说明,并使用我们的粘合剂指南重新装上显示屏玻璃。
将您的电子垃圾送到R2 或 e-Stewards 认证的回收商。
38等其他人完成本指南。
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26条评论
The thermal compound/paste that is used by Apple on the GPU and memory is less than stellar. I would highly recommend stressing the GPU Memory gap in this guide. As you can see in the images of the cooler, specifically the GPU side, apple uses a white paste compound for thermal transfer. The problem is that the cooler does not contact the memory for the GPU. Once you remove the cooler it breaks the compound in several spots, and it will never be as good as it was unless care is made, and you are aware of this prior to re-installation.
Furthermore, with the GTX775M and GTX780M equipped iMacs, the temperatures are already above normal without removing the cooler. If you try and push these chips with the added memory in the latest generation games you will get artifacts from overheating. Due to the gap between the memory and the cooler you are also unable to use Arctic Silver as a remedy, as the gap is too much, with the logic board being vertical. (Risking seepage down the board, which I have already seen when performing the proper fix on another iMac) The coverage and type of thermal compound Apple is using is not sufficient. In the factory state the thermal compound is centered on the memory, however only 40% of the actual module comes in contact of the memory and the cooler. What I have done on my iMac and a few others so far is use thermal tape.
Hello, i am upgradinf the imac at the moment and want to renew the thermal paste.
For the vram i want to use the thermal tape, could you twll me with thickness you used?
YES, I F*&^* hate thermal tape when compared to quality compound. With this only exception, the tape is more effective than the stock compound, and it is quarantined to make 100% contact, while dissipating heat properly. I have seen a drop of 15% under heavy use on the GPU since using the tape. YOU do not want to use cheap thermal tape! Standard tape only has a 3-5 watt thermal conductivity, which is equal to or less than a standard compound. You can go through frozencpu.com and purchase Fujipoly Extreme Thermal Pads which have a rating of 11. For use on the 27" iMacs, I went with 100 x 15 x 1.5 and (2) are needed to do completely cover both sides of the memory banks on the logic board.
Please, if you remove the cooler to replace the CPU you have to be aware of the GPU and the gap involved on the memory chips, and the potential of further gaps upon re-installation.