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User profile for user: MarcoStreet86
MarcoStreet86 Author
User level: Level 1
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Mac mini Mid2007 A1176 CPU Fan Always ON even when Mac turned off

Hello everyone, this is the first time I write in support apple. I'm an Apple user for many years and working in the world of computing.
I am a specialist in repairs Hardware and Software on Laptops and PC.
Personally, I use a Mac Mini A1176 mid-2007 CPU with 1.83 ghz intel core 2 duo.
A few days ago while the Mac is off, and also holds on to the CPU fan is at 8000 rpm.
I tried to reset the SMC but the problem persists.
I disassembled the mac and I replaced the fan with another purchased from a dealer, but the problem persists.
My mac has the version of Boot ROM Version MM21.009A.B00 and SMC 1.19f2.
you can have a firmware reset CD for this model?
I also made diagnostic tests and I was presented the following error:
4MOT/1/40000003 Masters - 8363
What can I do? Have you ever?
thanks

Mac mini, Mac OS X (10.7.5)

Posted on Jun 10, 2014 7:37 AM

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User profile for user: MarcoStreet86
MarcoStreet86 Author
User level: Level 1
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Jul 2, 2014 2:05 PM in response to lllaass

Hello, thank you for your help. But I had to solve in a completely different way. Unfortunately, the page proposal was no longer offering the SMC for my mac mini. I checked out other possible solutions on the net, but none have solved the problem.

So, despite not being a big electronic, I took a soldering iron, scissors and a trimmer and I made a manual change to the mac mini for reuse without hearing his fan at 8000 rpm.
First of all I removed the fan from the mac mini.
I cut the wires and I have identified the positive terminal, speed sensor, and the negative pole. To do this I used a 12V battery. With a resistance of 30 ohms I tried to feed it. (I wanted to use a resistor to avoid burning the fan by reversing the poles).
Once you have found the poles I bought on ebay the following product:
http://www.zalman.com/global/product/Product_Read.php?Idx=206
I cut the wires to the input voltage and have them welded to the cable connector on the logic board, and in the end I soldered the output cables to the fan.
Now finally straightedge speed from 3170rpm to 8000 rpm and the temperature at minimum speed with little load is 50 °.
The trimmer zalman warms up a little, but for me it is the best solution to continue to use my mac mini.
Unfortunately, the problem of my fan was definitely a hardware problem on the logic board.
Thanks for your help and I hope that my solution can also serve to others with the same problem.
P.S.


After this operation is a day that the mac mini is running without any problems 🙂


Sorry for my English by google .. 🙂




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Mac mini Mid2007 A1176 CPU Fan Always ON even when Mac turned off

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