Fully working PS3 ATX Power Supply Mod READ THIS FIRST: I recommend reading Naked_Snake1995’s guide first so you get a better understanding of the things that we’ll be doing in this guide. Link: http://www.psx-place.com/threads/tutorial-connect-atx-power-supply-to-ps3.17180/ All the pictures of my PS3 mod will be posted after the guide and there will also be a YouTube video showing this mod. Introduction After my PS3’s power supply died I found out that you could power it using an ATX power supply, only problem was that the PSU had to be powered manually by shorting the green and black wires from the 24-pin connector together. After some days researching about the PS3’s power supply and some ATX power supply mods involving Arduinos to power them on I figured out that the ATX power supply could be turned on using the PS3’s power button as if it was the original power supply. Credits: Mr.Dutch from ps3hax.net for all the research he has done regarding the PS3’s PSU: https://web.archive.org/web/20141023220831/http://www.ps3hax.net/showthread.php?t=58231&page=2 Naked_Snake1995 from PSX-Place for his tutorial on how to use the ATX PSU: http://www.psx-place.com/threads/tutorial-connect-atx-power-supply-to-ps3.17180/ psdevwiki writers for all the information and pictures that they have collected and made available for us to use: http://www.psdevwiki.com/ps3/Power_Supply How to There are two methods for doing this, the fist one involves using an optocoupler and the second one involves using an NPN transistor. I’ll be detailing the steps to perform the first method. I went with this method because I think its safer in the long run due to the fact that if a transistor is burnt there’s a high chance of shorting its 3 pins and getting voltages in places they don’t belong. Optocouplers are also called opto-isolators since the current that activates the transistor is isolated from the collector and emitter current of the transistor. This is because the transistor is a photosensitive transistor and the activator is an infrared LED. More information about optocouplers can be found here: https://www.electronics-tutorials.ws/blog/optocoupler.html Components needed: -ATX PSU -A 220 Ohm resistor (I’m using a 200 Ohm resistor) -A 2561D Optocoupler (6 of this can be found on the broken original PSU). Datasheet: https://www.renesas.com/ko-kr/doc/YOUSYS/document/002/PN10777EJ02V0DS.pdf -24-pin female connector (optional) -4-pin female CPU connector or female Molex connector (optional) Explanation of the parts chosen: The 2561D optocoupler was chosen because there were 6 on the broken power supply and I decided to reuse them. The 220 Ohm resistor was chosen based on the characteristics from the optocoupler’s data sheet. The optocoupler’s diode has a 1.2V forward voltage with a 10mA current, so with the 3.3V provided from the ACDC_STBY line the equation is like this: (Vin-Vf)/Ic=R, so we have (3.3-1.2)V/0.01A=210 Ohm and the nearest resistor going up is 220 Ohm. I had a 200 Ohm resistor lying around so I decided to use it as the actual current flowing would be around 10.5mA, not a lot more taking into consideration the 40mA maximum current stated in the data sheet. The 24-pin, the 4-pin or Molex connector were chosen to make the connection externally, so the ATX PSU can be unplugged and used for other purposes if needed, and it would also make it a good-looking mod with no wires exposed. These are the schematics for the optocoupler’s connection ACDC_STBY is one of the PS3’s wires that connect to the stock PSU. This wire has 0V when the system is off, and when the power button is pressed it gives 3.3V to tell the PSU that it has to turn on the 12V rails. We’re using this 3.3V state to turn on the optocoupler. PS_ON is the ATX PSU green wire, this wire has to be shorted to ground in order to turn the PSU on. We will be able to do this with the optocoupler. Then we have to connect the purple wire (5V_SB) of the PSU to the ACIN_DET pin and the 5VSB pin on the PS3’s motherboard, these are the ones responsible of powering the low power section of the PS3 when it's turned off. After this we must connect the yellow (12V) and black (GND) wires to their respective pins on the PS3 motherboard. After this the PSU should be working fine, powering itself on only when we turn on the console. My results 1- I recycled the stock PSU's 5V connector making it easier to take apart the console if needed. 2- That's the optocoupler (the resistor is under the yellow tape on the red wire) 3- I recycled the stock PSU's 12V connector making it easier to take apart the console if needed. For more pictures see the attached images below. YouTube video: Any corrections or suggestions regarding the guide are welcome.