MP 1,1-5,1 Rear CPU fan don't work.

donvito4ever

macrumors member
Original poster
Apr 9, 2016
53
8
Spain
I bought a 5.1 2010 dual CPU this morning and when I connect it and go to configure it, I saw that the rear CPU fan didn't work. I start Mac CPU fan to test it and not work...

How can I test where is the problem?
 

amedias

macrumors regular
Feb 9, 2008
186
155
Devon, UK
Well first of all check that the connector is actually plugged in on the backplane!

If it is then the quick way to find out if it's the fan or the board is to plug another fan in and see if that works, if you don't have another one to hand then you can use the front fan, the connector is the same and they're not that hard to remove and swap but you might have to get a bit creative as to where you put everything to power it up!

The other option is get a multimeter on the outputs to see if anything actually coming from the connector but that's tricky as there's not really room to do it without making a dummy connector lead and trailing that out past the CPU...

EDIT - just realised I'm talking about the CPU cage fans and you might be meaning the booster fan in the CPU heastink?

If it's the booster fan then that's harder to test without just replacing it as you can't really subsitite another or get to the connector while the machine is running. It would be worth popping the heatsink off though and making sure the connectors are not damaged.
 
Last edited:

donvito4ever

macrumors member
Original poster
Apr 9, 2016
53
8
Spain
Well first of all check that the connector is actually plugged in on the backplane!

If it is then the quick way to find out if it's the fan or the board is to plug another fan in and see if that works, if you don't have another one to hand then you can use the front fan, the connector is the same and they're not that hard to remove and swap.

The other option is get a multimeter on the outputs to see if anything actually coming form the connector but that's tricky as there's not really room to do it without making a dummy connector lead and trailing that out past the CPU...

Thanks for your answer...

Finally, I was disamble and resamble 3 times... clean all with isopropilic alcohol, and now works!!
 

amedias

macrumors regular
Feb 9, 2008
186
155
Devon, UK
Great news! By the way, which fan was it, the boost fan in the heatsink or the one at the rear of the cage?