Dell PSU pinout - RC Groups
Thread Tools
Oct 07, 2011, 02:09 PM
Registered User
UlteriorModem's Avatar

Dell PSU pinout

Okay I got this Dell computer psu

It is model No. PS-5251-1D

Rated at 250 watt output.

It has that odd 24 pin connector in lieu of the ATX style.

I cant find a pin out diagram for this sucker anywhere.
Sign up now
to remove ads between posts
Oct 07, 2011, 02:29 PM
Registered User
The 24-pin connector isn't odd at all. Most computers manufactured in the last several years use one. It's been around since PCI Express was introduced.

I'm not entirely sure of the pin-out, but what I am sure of is that you won't get anywhere near 250watts out of it. The 12v rating is what you should be concerned with and it only has 14a max available there. That means 168watts max.
Oct 07, 2011, 03:02 PM
Registered User
UlteriorModem's Avatar
Which is more than enough for my use right now. My charger is capped at 50 watts anyhow.

Maybe someday I will need more but for now this will work fine. If I can get it to work.

I got it to turn on (short grey wire to ground) but it wont latch even with a load on it.
Oct 07, 2011, 06:52 PM
Registered User
UlteriorModem's Avatar
Found the pin out... for any future searchers.

Havent finished making it work yet.
Oct 07, 2011, 08:05 PM
Registered User
UlteriorModem's Avatar
Turns out this one is amazingly easy.

Chop off all the conductors except a yellow, two black, and the grey.

Bind and insuluate the choppped off conductors in groups by color. I just cut them off and put shrink tubing over the ends. I dident even join them together.

Watch out one of those heat sinks has 120 volts on it! dont ask... anyhow...

The yellow is +12 or thereabouts DC (actually around 11.5 volts). The black are common. The grey is a simple power on power off. Bond it to ground (common) and the psu powers ups. No loading resistors required

I hit it as hard as I could with my wimpy charger at 5 amps into a 3S for a few moments, voltage barely flinched.

I am a happy camper considering the price

Oh and its real quiet too!
Oct 31, 2011, 11:00 AM
Registered User

Dell NPS330 GB B Power Supply

When I attached my Triton charger to the PS the unit shut off. Any ideas why?
Oct 31, 2011, 11:12 AM
Registered User
UlteriorModem's Avatar
Is it the same PSU?

IF it is the 'on' switch (connecting the grey wire to ground) has to be maintained contact I used a spst switch.

IF its not the same PSU probably a load resistor is going to be required to get the psu to 'latch' lots of other threads on converting those 'other' power supplys.
Oct 31, 2011, 11:37 AM
Registered User
Well it's not the same unit that you have. I did solder the gray/black(switch) wire together. Any idea where the load resistor goes?
Oct 31, 2011, 12:32 PM
Registered User
UlteriorModem's Avatar
Well if it is a different PSU I cant really help that much.

Does the psu power up when the grey wire is connected to ground?

Did you check the voltage outputs?

I think they place a power resistor on the 3 v buss there are several articles here on the topic. Search around a little.

Here is a wiki article on the topic.

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Mini-HowTo Dell Server PSU - Model NPS330BB A PhotoGreg Batteries and Chargers 22 Jul 14, 2014 11:59 AM
Discussion Astec AA23260 PSU pinout (for ibm x346 servers) sk8guy Batteries and Chargers 5 Apr 26, 2014 06:36 AM
Discussion Dell 1950 Server PSU (NP679) insurgus Batteries and Chargers 7 Mar 29, 2013 09:26 PM
Discussion Computer PSU as lipo charger PSU - testing TheNiceGuy Batteries and Chargers 0 Jul 23, 2011 03:11 PM
Discussion Dell Server PSU for charging? tonkajeep34 Batteries and Chargers 3 May 22, 2010 12:03 AM