Skip to main content

Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

708 Questions View all

Need iMac power supply voltage pinout. Short fan spin then dies

Hi guys,

I’m working on the 2011 27” imac and it gets no power.

  • I only get Diagnostic LED #1 on
  • When I press the power button, I get momentary fan spin then it stops
  • I don’t know what the power supply pin voltages are supposed to be, but out of the 14 or so pin points, I only get a measurement from TWO : 12v and 3.9V

The customer has also reflowed this unit due to the GPU problem, but would the GPU prevent the machine from getting boot power?

Hoping someone can provide the power supply pinout voltages so I can see if it’s logic board vs PSU. Thanks!

Answer this question I have this problem too

Is this a good question?

Score 0
Add a comment

1 Answer

Most Helpful Answer

Not sure if this will have what you need but this is suppose to be the schematics for it: https://www.scribd.com/document/27449012...

Was this answer helpful?

Score 1
Add a comment

Add your answer

KRepair will be eternally grateful.
View Statistics:

Past 24 Hours: 0

Past 7 Days: 0

Past 30 Days: 0

All Time: 156