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Fans running at full speed, no temp readings

So I replaced my 2011 MacBook board with 2010 (cuz of budget), everything running well but I had to disconnect the battery cause of the connector, which made fans unhappy.

It’s safe to note that those are 2011 fans, not 2010, but that shouldn’t be a problem.

When I power the MacBook on, fans immediately spin up to 100%, and any of the programs I tried (SMC Fan Control, Macs Fan Control, TG Pro) are not reading any temperature and any fans.

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Well, I guess you proved it you will need to swap out the fans too! Then you’ll need to see what else is likely to bite you like the HDD/SSD as the 2010 system is only a SATA II (3.0 Gb/s) system whereas the 2011/12 models are SATA III (6.0 Gb/s)

In the long run I think its just smarter going up then down! The 2011 boards GPU’s are just not very good! Many die as people push the system harder than what was expected. I strongly recommend jumping to a 2012 logic board and sadly its not cheap either (ranging between $500 to 675 USD deepening on the CPU version)

As it turns out the 2011 and 2012 are based on the same hardware unlike the 2010.

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Yes, fans. But it should at least read temps, right?

Edit: All fans on eBay are listed for all unibody models, don think there is much difference, also it doesn't have battery, so that might be a problem too.

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@Pavol Porubský - You would need to install a good thermal monitoring app to see what the temps are. What you are seeing here is the fan motor tach sensors are not being accessed correctly so SMC is assuming you have a failure! At which point it will push the fans to the max.

I would install this app TG Pro so you can see whats happening. Get the full version to get the diagnostics.

I still think you are reaching here, sorry ;-{

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@danj Hey, literary stated that I used those apps. But I have read some more similar problems and it seems, it is the battery.

https://apple.stackexchange.com/question...

I forgot to mention the backlight does not work and on the first boot macbook only boots with discrete gpu.

I will get a battery and then I will see.

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@Pavol Porubský - SMC has access to quite a few sensors!

All it takes is loosing access to one for the system to go into CPU Safe Mode. It could be the battery it could be the display it could be the fan.

You really need to run diagnostics to see whats up. Otherwise you're just chasing your tail.

Hobbling a system together from unrelated parts gets tricky! As you don't know why the error is happening is it a bad part or is there something wrong.

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