So I still have Pin 5 and 11 on the 12V port and Pin 11 and 12 on the 24V port which are a mystery. We can see that this power supply only provides 12V and 24V, as surprising as it may seem, it is the motherboard that is in charge of transforming the 12V into 5V! (the cable between the power supply, the motherboard and the hard disk confirms it). Pin 3 = GND -> if SATA connected (creates a bridge with the last 1pin connector of the power supply)Ī last connector is present on the power supply, it is a ground that seems to be dedicated to the 5V (it is connected to one of the SATA GNDs and to the motherboard).It is sufficient to make a bridge between the ground (PIN 1,6,7,12) and the 3.3V (PIN 4), which activates pins 8, 9, 10 Otherwise, I made some progress in my tests, I managed to activate the power supply! If ever a reputable soul has good technical sources, the power supply is a Delta ADP-250AF B.
PS : Sorry for my pitiful English, I'm Frenchįortunately, the iMac's power system is simpler, they don't have to switch between the battery and a potential faulty or counterfeit charger.Īnd no, unfortunately, I couldn't find any technical documentation on iMac power supplies of this generation Know which pins to connect to activate the power supply (if I had this element, I could measure the voltages myself).įor the rest, I'm drying up, if you'd give me a hand, I'd be extremely grateful.The voltages (and current) of the output connectors which are obviously not standard (12 pins for the 12v-3.3v and 12 pins for the 24v that runs towards the inverter of the screen, although for the latter, I don't really care).But to do it right, I need to use the power supply for the screen (+ fan and why not also power the raspi). I decided to tinker with an old broken iMac (machine that shuts itself down) to make it a Media Center with my Rasberry Pi and its Hifiberry + an LCD controller. I would like some insights about iMac's power supplies, especially the Early 2009 24" (A12).