2011 iMac 27" EMC 2429 not powering up, can I rule out power supply?
Mid 2011 27” iMac A1312 EMC 2429
My iMac will not power on. When I hit the power button, I hear no chime and no fans. I have already tried unplugging it and holding the power button, then replugging it in. I have tried removing the RAM, dusting and putting it back in.
I removed the display and gave everything a good dusting. The far-left diagnostic LED is on and green. The other 3 LEDs will not indicate anything because I can’t turn on the computer.
I have tested the voltages on both the power supply and the logic board with a voltage meter from the back.
Power Supply Results:
- Pin 1 - Ground
- Pin 2 through 4 - No voltage
- Pin 5 - 14.78 V
- Pin 6 - No voltage
- Pin 7 - 4.06 V
- Pin 8 and 9 - No voltage
- Pin 10 - 3.63 V
- Pin 11, 12, 13, 14, 15 - approx. 13.5 V
- Pin 16 - No voltage
Logic Board Results:
- Pin 1 - Ground
- Pin 2 through 5 - No voltage
- Pin 6 - 4.2 V
- Pin 8, 9, 10, 11 - 15.2 V
- Pin 12 and 13 - No voltage
- Pin 14 - 4.2 V
Is it safe to rule out the PSU as the problem here?
If it’s not the PSU, what should I check next? Could this be a problem with the power switch? Any suggestions would be greatly appreciated.
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