![]() ![]() The use of a single-block piece of aluminium, waterjet-cut - what made the unibody form factor what it was - can both hold and dissipate heat passively and over a wider area of the case more effectively than the previous form factor (it’s also not a surprise that every MBP since has used a variation on this principle). ![]() (And no, the failure of the AMD GPU was not related to the case design of the unibody 15/17-inch.) ![]() In fact, this was a cornerstone of the passive cooling approach not available to the earlier aluminium design. The unibody case, over its predecessor, did have more aggressive cooling. I can’t say I’m on the same page about this. Sorry for the guide being so badly made, i suckįeel free to ask me anything about this machine, loving it. Alternative is to never even put it to sleep, which is the least risky (less heat cycling), but honestly, the sleep method is good enough, and saves power. If you accidentally let the battery discharge or shut it down, theres a chance, the gpu will fail, with this "trick" however, you can probably use the computer forever, at least from my experience of using this 2008 everyday, and my old 2007. = THE FIX= So if you instead put the computer to sleep on battery or charger (instead of shutdown), whenever you stop using it, it doesnt cause a full heat cycle, only cooling the system to about 40C, which is not cool enough for the GPU to fail again, as it does fail when it falls below a certain temperature. a functioning battery, which can last about 30 minutes under load, and a few hours in sleep mode or a charger.Įssentially, when you turn the computer off and on every day or two (complete shut down, not sleep), the computer cycles through heavy heat cycles, which cause the paste under the GPU die to fail ,once it cools down, much easier after it has been "repaired", or hasnt failed yet, which causes the GPU to either not respond anymore (black screen on boot with sleep light on = complete meltdown, but repairable), or to artifact (lines on screen = usually unfixable at this point). Turn ON AUTOMATICALLY RESTART AFTER POWER FAILURE IN ENERGY SAVER IN SYSTEM PREFERENCES, so in case of accidental power failure, the GPU wont cool down so much and the computer should still start even in its fragile state. WHAT TO DO FIRST : to lower risk of failure, is to install macsfancontrol, and max the fans out, just completely max them out, constantly, it will also reduce the heat diferrences that the gpu goes through maximally, it is also recommended to clean the computer and replace its thermal paste, this is what you should do FIRST, unless your computer is already in the state that it fails when you turn it off, making this impossible, without doing the DIY repair again. Is really simple but extremely effective. What Ive learned to temporarily prevent failure of these unrevised variants, if it hasnt failed yet, or has been "repaired" by a reball, heat gun/hair dryer and oven method, I went through two 2007s, one 15 and other 17, now im on a 2008 17,Īll had unrevised NVIDIA GeForce 8600M GT chips, each with diferrent variants, and diferrent VRAM. ![]()
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