(EDIT: i forgot to finish my sentence there. have you measured the output of your current power supply? if the output rails are all close enough to their rated voltage it is most likely fine, but if one of them is WAY out of spec you've probably found your cause. you're basicly SOL.ĭepending on how tight the voltage rails need to be, it could be possible to build it from a set of (industrial) power supplies, but at that point i'd suggest either just buying the official power supply second hand. if you have to deal with big rails of different voltages (like for example if the main power output is at +24v) or have some sort of serial communication protocol to communicate with the power supply. after you're done, you compare the output of the original power supply and the output of your custom cable job, if they match you hook stuff up.ĭo keep in mind you need to have the necessary tools: a multimeter, a crimping tool or soldering iron, ideally a de-pinning tool for all your connector types, and the usual arrangement of sidecutters, pliers, wire strippers, etc. you take the map of the output connector pinout, put it next to the PSU's modular connector pinout, plan out where your wiring will go, and start wiring things up. you go to some parts supplier like digi-key, and order the connectors for the mac side, and the connectors for the PSU side. you buy a modular ATX power supply, and take note of which connectors it uses. in case you need to do translation for certain control lines (for example if PS_ON or PWR_OK signals are handled differently) you have to figure out how to implement those. you trace back which connectors they are, and given that 2000s apple wasnt as horrid as things are today they're a standard format you can still order today

you create a map of the output connectors you need, and their pinout (which pins are +12v, which are ground, certain control pins, etc.)

I've recently done the exact same thing for an AT power supply that was needing quite urgent replacement. if they dont have the same rails, or they cannot be derived easily (like a 0.1A -12v rail for some ISA slot cards) it's a nightmare Given that they have the same voltage rails.

Power supply for mac pro 2015