No power but PSU is fine
So I'm trying to fix my iMac 21.5" late 2012 (EMC2544/A1418)
There is no response from the power button, no fans, no screen light up, no beeps, nothing. So basically it won't turn on.
First off, none of the diagnostic LEDs light up.
- There is 12v measured on the logic board where the PSU plugs in.
- There is 3v measured on the logic board where the PSU plugs in.
- Coin cell voltage is 2.78v with computer unplugged.
- I have tried resetting the real time clock.
When I hold the power button in and plug the power in trying to force it to turn the fans on into high power mode, nothing happens.
Anyone have any ideas? Seems like a fault on the logic board, but I'm not going to buy a new one. I'm hoping there is something simple that I've overlooked.
crwdns2934109:0crwdne2934109:0
crwdns2944067:02crwdne2944067:0
Can you give us some background here on what happened just before the system died.
Did you have a lightning storm or other power disruption? Do you have your system plugged into a good surge suppressor or UPS?
What happens when you disconnect all of the peripherals (including keyboard & mouse) will the system power up then?
As you had opened the system did you note any burnt chips or smell anything burning?
crwdns2934271:0crwdnd2934271:0 Dan crwdne2934271:0
Hi,
I came back from vacation and It just didn't turn on. I'm not sure if there was a power surge or not, it's not using a surge suppressor, and I do live in a lightning area.
crwdns2934271:0crwdnd2934271:0 Nicholas Westmoreland crwdne2934271:0