Aller au contenu principal

Réparez vos affaires

Droit à la réparation


Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

Questions au sujet de 457 Voir tout

PSU power on signal

I’m trying to to use the iMacs PSU to build a mini-itx hackintosh.

Is it possible to use the power-on button in the iMac and then somehow connect it to the PSUs pin12, which should be the power-on signal?

PSU pin-out: Power Supply (PSU) pin-out diagram

I have removed the main board to make room for a display converter board to use the screen as a monitor, so I need to connect the power-on button directly to the PSU if possible.

Répondre à cette question J'ai le même problème

Cette question est-elle utile ?

Indice 0
Ajouter un commentaire

Le kit d'outils Essentiel

Les outils les plus utiles dans notre kit le plus compact.


Le kit d'outils Essentiel

Les outils les plus utiles dans notre kit le plus compact.


1 solution

Are you using the Apple power supply or the one that came with your conversion kit?

You will need to emulate the circuit Apple uses on the logic board which feeds the Apple power supply the power on signal. Remember this is a soft power button, it is a momentary switch driving a signal line low (chassis ground).

Cette réponse a-t-elle été utile ?

Indice 0


Hi Dan


I want to use the Apple power supply for the entire Mini-ITX build. Currently, I’m using an external power brick to power the screen, but if I can get the Apple PSU to power up I want to switch to it.

Yes, I figured its a soft power button. Question is:

Does the PSU power up if I just connect Pin 12 to ground?

IF this works, how can I then turn the soft power button signal into a permanent signal for the PSU to remain on?

Does the PSU require any load like a normal ATX PSU, where a small 10-20W resistor can be applied to the 5v rail to emulate the motherboard (seen here:


You'll need to experiment!

I have not dug that deep into the circuit and its not documented any where.


Ajouter un commentaire

Ajouter une réponse

Justice sera éternellement reconnaissant.
Afficher les statistiques:

Dernières 24 heures : 0

7 derniers jours : 1

30 derniers jours : 1

Total : 25