Model A1181: 1.83, 2, 2.1, 2.13, 2.16, 2.2, or 2.4 GHz Core 2 Duo processor

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Random Shutdown Issue Possibly fan?

I bought a Macbook second hand off ebay with the intention of fixing it. The problem described was an easy fix, simply reinstall OSX and it should work fine. So I did this and discovered it had another issue in that it reset all the time. This was fixed by buying a new heatsink and sensor but after about 6 months it started to reset again. I tried all the obvious options, i.e. RAM, hard drive, fan speed but decided I had to face the fact that I needed a new logicboard. I ordered one off ebay and a new heatsink to go with it and guess what, it resets too.

So now I am completely stuck. I don't think it's the fan since I used to run that at full tilt with SMC fan control. However, I am not certain as the logicboard I have used as a replacement is a core duo 1.83 GHz, and the board it replaced was a Core 2 Duo 2.0GHz. The Macbook booted fine and worked without needing a reinstall, except for the keyboard and trackpad. Also, SMC fan control had trouble getting the fan to spin up. It just seemed to reset after about 5 minutes which was around the sort of time it used to reset when I had the 2GHz chip in there.

Any ideas?

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When u say "reset" do you mean it reboots? Or do you mean your settings reset? Please be more descriptive of your issue.

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Sounds like you need a new PRAM battery. You're throwing me off when you say reset cause I dont know exactly what u mean. But, if your SMC FAn control doesn't maintain it's settings for more than a few minutes, you might need to zap the PRAM or replace it.

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It completely shuts down. But it used to simply reboot.

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I've noticed that the fan does not spin on the Core Duo, but it works fine on the Core 2 Duo. I assumed that this fan would work in both equally well. Would a bad temperature sensor cause it not to work? I just bought a new one from ebay and I can't test it on the Core 2 Duo board as the connectors are different.

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Andrew, I buy parts from iFixit even if they do cost a bit more than eBay because they send the correct part and I have confidence that it will work. I also don't have to spend weeks returning the part on eBay. I lost to many customers from bad parts on eBay. There are some exceptions like rdklinc but I won't buy from anyone without a 1000+ rating & 98% or better.

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Alas ifixit do not have the part that I need.

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The fan seems to be working now, the Macbook was able to run long enough to download an SMC update and an EFI update. Then it shutdown straight after. It seems to work fine until I try to run a big update. I am seeing the same random message I used to get on the Core 2 Duo, asking if I want to shutdown when I haven't pressed the shutdown button. CPU temperature is only 52 degrees according to SMC fan control. I am beginning to think that the keyboard might have something to do with this, as it sometimes requires me to reseat it to work. If it was malfunctioning it could be responsible for the shutdown question.

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Andrew Millar will be eternally grateful.
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