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Mac Pro mid 2012 Screeching PSU fan?

Zaithe

Zaithe

macrumors member
Original poster
Jun 27, 2016
78
11
I hear a sound toward the back of my tower near the PSU which sounds horrible. It's very loud and am sure its a fan. I think its the PSU fan. Is the PSU fan inside of the PSU or outside of it? Do i have to buy a new PSU or can i just buy a fan like this to replace it? http://www.ebay.com/itm/076-1232-Ap...oling-Fan-076-1232-4-Pin-Genuine/401257968567

It says its for a A1186 when mine is a A1289 but i can't find a A1289 PSU fan. What should i do? Thanks in advance!
 
Zaithe said:
I hear a sound toward the back of my tower near the PSU which sounds horrible. It's very loud and am sure its a fan. I think its the PSU fan. Is the PSU fan inside of the PSU or outside of it? Do i have to buy a new PSU or can i just buy a fan like this to replace it? http://www.ebay.com/itm/076-1232-Ap...oling-Fan-076-1232-4-Pin-Genuine/401257968567

It says its for a A1186 when mine is a A1289 but i can't find a A1289 PSU fan. What should i do? Thanks in advance!
Click to expand...

The fan is independent to the PSU. However, it seems the PSU fan is a part of the case. That's why you can't find the parts.
 
h9826790 said:
The fan is independent to the PSU. However, it seems the PSU fan is a part of the case. That's why you can't find the parts.
Click to expand...
Good to know, do you think the A1186 fan would work as a replacement? After all the case design is almost identical..
 
You can verify which part it is for sure with MacsFanControl. Raise/lower the fan speed of the PS fan and the screech should change pitch if its that fan. If its not that fan, try the other fans to identify which fan. If its none of the fans, maybe its a screech from the power supply from bad caps.

Some people here have had success fixing bad fan noise by thoroughly cleaning out their fan.

If the bearings are going bad or running dry and there is access to the oiling point, you might try lubricating the fan's bearings: http://www.overclockers.com/em-spinning-lubricate-pc-fans/
(I don't know if the MP's fans can be oiled this way.)
 
h9826790 said:
I doubt if that's out of stock or never exist, the 4,1 / 5,1 PSU fan part number not even exist in the technician guide.
Click to expand...
You seem to be right. It is just gone from the parts list compared to earlier macs, never noticed that 'till now
macpro_2006-1.jpg macpro_mid2010_mid2012-1.jpg

P.S. my cMP1,1 is on the loan to a friend right now, but as soon as i get it back ill open them up and compare fans, just for the sake of it.
 
Last edited:
Thank you guys for your help, i'll try to physically track down the fan to see if i can get a better idea of whats going on. Adjusting the PS fan in mac fan control increased the RPM's of a fan near the front of the computer. The broken fan doesn't seem to show up in the list as those all work fine. The broken fan however will barely turn.
 
Zaithe said:
Thank you guys for your help, i'll try to physically track down the fan to see if i can get a better idea of whats going on. Adjusting the PS fan in mac fan control increased the RPM's of a fan near the front of the computer. The broken fan doesn't seem to show up in the list as those all work fine. The broken fan however will barely turn.
Click to expand...

Do you mind to post a screen capture of MacsFanControl? Just want to know your PSU temperature if you suspect the fan is failed. Thanks!
 
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