ATX Wire Color Help - Sparkle Power SG-300G

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In summary, the conversation discusses the process of converting an old PSU into a bench power supply. The PSU in question is a Sparkle Power SG-300G, which is believed to be an AT or LPX form factor. The conversation also touches on the issue of wiring the power switch and the green wire, which is likely a case or chassis ground. It is suggested to refer to online tutorials for guidance on the conversion process.
  • #1
IronBrain
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I managed to pick up a few years old PSU from the computer science professor at college :D, If anyone remembers my post a few weeks ago I was very enthusiastic about this. However, I've identified all wires labeled and from the standard tutorials on the internet, the white wire typically listed -5V is the PG Signal and this PSU contained an external switch for the balling bearing fan. It is a Sparkle Power SG - 300G I tried finding a more detailed wire guide to help me clarify that at the very least the green wire is power_on for fact before I wasted my time and fry something I got for free. On the switch there was a o-ring terminal for the green wire and the switch 4 pole I believe I had White(PG) Blue(listed -5v) Brown(-12V) and Black(of course, GND) Thanks
 
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  • #3
Yes, thanks I've read over several tutorial, through some googling for a few hours, I believe my PSU is maybe an AT, it has an external switch which turns the fan on and off with push push and by the switch is a terminal ring which is green, which I assume in very older motherboards was attached somewhere. The only voltages this thing can put out is 12 V and 5 V plus or minus, a white wire for Power Good Signal other weren't defined such as brown, orange, gray, purple combinations used in 3.3 V for the corresponding color orange I believe. The unknown wires to me are brown the green terminal post which is connected to the DC Input outlet then that wire is grounded where another wire connected to the ground is ran through with the switch the switch having four posts white brown black blue, I am just trying to see if any if the unknowns correspond to a power on signal of the sorts so I can properly convert this PSU without wasting time and components

The PSU: Sparkle Power Inc. SPI-300G 300 watt, I'd imagine very old

This is the schematic of shorts for the exact PSU
http://www.sparklepower.com/pdf/SPI-300G.pdf

Found this in the link

Power Good Signal: Power on delay time 100 ~ 500ms, off
delay 1ms minimum (TTL and CMOS compatible)Does this mean Power Good is just a delayed Power On Signal function which I can use in my switch for my conversion?
 
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  • #4
Yup, that sounds like an AT supply (or more probably, an LPX--low profile baby-AT). It normally plugs into a 12(?) pin connector on an AT board:
http://www.pcguide.com/ref/power/sup/form_BabyAT.htm

The green wire with the ring terminal is most likely a case or chassis ground and wired to the ground pin on the plug. Probably meant to go on one of the chassis screws.

If I remember correctly, most of these had a switch on them which would directly connect the wall AC to the power supply. The memory's a little fuzzy on the particulars, but I think the back switch was wired to a remote switch on the front (that or a connection to drive an internal relay). Regardless, there was live 120/220 V on the switch. Post 3 (under the Power Switch heading) on the following thread goes into more detail about the wiring on the switch, which sounds like the part you're having difficulty with:
http://www.hardforum.com/showthread.php?t=756864
 
  • #5
I believe the next link on the page is it. The LPX Form Factor
http://www.pcguide.com/ref/power/sup/form_BabyAT.htm

As for the green terminal it is grounded to the PSU case

Thanks for the amazing help I am checking that link out now and will edit this post if need be, once again thanks!

Exactly what I was looking for, however it doesn't seem like I can set up a remote toggle switch spst can i? and how would I wire the green terminal so the power comes on not just the fan?
 
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  • #6
IronBrain said:
I believe the next link on the page is it. The LPX Form Factor
http://www.pcguide.com/ref/power/sup/form_BabyAT.htm

As for the green terminal it is grounded to the PSU case

Thanks for the amazing help I am checking that link out now and will edit this post if need be, once again thanks!

Exactly what I was looking for, however it doesn't seem like I can set up a remote toggle switch spst can i? and how would I wire the green terminal so the power comes on not just the fan?

I think you did the same thing I did--link to the frame, and not the actual page in question. Short of splicing longer wires on the switch, or maybe using a relay, or splicing an inline switch onto the power cord, there probably isn't a really easy way of making a simple remote switch.

Lastly, the fan turning on should indicate that the power supply is also turned on and outputting power! The green terminal should have no impact on this.
 
  • #7
Id Imagine that the green wire has to be grounded to get power i ran a voltmeter on it and with the fan just on no output power i got from the 5v rail
 
  • #8
IronBrain said:
Id Imagine that the green wire has to be grounded to get power i ran a voltmeter on it and with the fan just on no output power i got from the 5v rail

No, the green wire should be the ground connection point FOR the case. This is meant purely as a protective measure, and should ordinarily never carry current. You shouldn't have to plug it into anything for the power supply to work. Wait, you're using the cable that was supplied with the power supply to connect it to the wall, right?

If the fan is on, there should already be 5 or 12 V being generated (otherwise, the fan would not turn on--it's internally connected to one of the outputs of the power supply). The possibility is that one of the outputs has blown, and that might be why you don't see anything on that particular output. If it works only when the green wire is connected to ground, then you probably have a faulty connection somewhere inside the power supply (my guess: one of the connections to neutral is blown).
 
  • #9
Yeah the fan turns on, and the 5V rail measures 0.01 volts if that, but the fan is wired internally to a postive 12v rail ill test the 12 v rail
 

1. What do the different wire colors on an ATX power supply indicate?

The different wire colors on an ATX power supply indicate the purpose of each wire. The color coding follows a standard set by the ATX specification. For example, the 24-pin main power connector typically has one 12V wire (yellow), one 5V wire (red), and one 3.3V wire (orange), among others.

2. What is the purpose of the SG-300G power supply from Sparkle Power?

The SG-300G power supply from Sparkle Power is an ATX power supply unit (PSU) designed for use in desktop computers. It provides the necessary power for the various components in a computer, such as the motherboard, CPU, and graphics card.

3. How can I identify the wire color codes on my SG-300G power supply?

The wire color codes on the SG-300G power supply can be identified by referring to the user manual or the specifications sheet provided by Sparkle Power. Each wire should have a label indicating its purpose and corresponding color code.

4. What should I do if the wire colors on my SG-300G power supply do not match the standard color coding?

If the wire colors on your SG-300G power supply do not match the standard color coding, it is important to consult the user manual or contact Sparkle Power for assistance. Attempting to connect the wires incorrectly can damage your computer components.

5. Can I customize the wire colors on my SG-300G power supply?

It is not recommended to customize the wire colors on your SG-300G power supply as it may void the warranty and can also cause confusion when troubleshooting any issues. It is best to follow the standard color coding to ensure proper and safe installation.

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