The psu #5251D and the #NPS250 and the #24RGY are all similar. I have been told that the POWER ON wire for the 5251 is GRAY position #16 in the 24 pin molex. For the NPS it is GREEN position # 13 or # 16. For the 24 it is also GREEN in position # 16. Is all this correct? Is power on accomplished by shorting this single wire plus ground? A wire diagram or simple chart for these 3 PSUs would be welcome. Also what is the 3 main rail voltages? For the 5251 it is supposed to be 12 but it reads 11.75. the other two are also under. Is this the cause of a SOLID ORANGE led on the power board? I have been told yes. I want to test the new 24RGY before hand. That is why I need this info. Too many variations as always. No standards even for various DELLs of similar design. Drives me nuts.m Thanks in advance. reeltoreelguy@gmail.com.
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Last edited by rtrg; 11-16-2012, 02:25 PM. -
Re: dell psu
If these power supplies are standard 20 pin ATX units, then pin #14 would be the PSON signal (power on) regardless of color of the wire going to that pin.
If these power supplies are standard 24 pin ATX units, then pin #16 would be the PSON signal (power on) regardless of color of the wire going to that pin.
The only exception to this is old Dell Pentium II/3 era power supplies which have a 20 pin ATX connector but with a different pinout.
I can't really find much info on the power supplies you posted, other than the NPS250 which is a 250W Newton. I think some pictures may help. -
Re: dell psu
Retiredcaps had a headache with dell psu some time ago, perhaps 12 months. It involved the psu not starting with just the green wire I think perhaps the grey wire provides a signal from the mboard to tell the psu the voltage it is getting is ok and to keep going
otherwise it stops. Try the search feature Dell gray or dell grey might find it.
Also google dell power supply pinout.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: dell psu
the PSUs at hand are non standard atx 24 pin. #13 is power on with 3 black gronds adjacent. the wire is gray. the model #s vary but so far the wiring is thae same. I have a 25REH mobo I am pretty sure is no good as three PSUs fail to power it up. steady orange led on the power board. new 4H665 mobo coming pulled from a working system.Comment
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Re: dell psu
This was the thread I meant - not same psu but may help you
https://www.badcaps.net/forum/showth...ight=Dell+GREYPlease upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: dell psu
My issue is the exact opposite. The PSU WILL turn on when shorted ps-on to ground. But the mobo will not turn on when connected. More PSUs coming to vrtify that the 25REH mobo is indeed no good. More 4H665 mobos coming to match the PSUs. As long as the mobos power up I will be happy.Comment
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Re: dell psu
If you have multimeter, check if all voltages are fine, if not, that may be the reason why MoBo does not start. But the MoBo may be faulty too.Less jewellery, more gold into electrotech industry!
Half of the computer problems is caused by bad contacts 
Exclusive caps, meters and more!Hardware Insights - power supply reviews and more!Comment
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Re: dell psu
I have come to the conclusion the mobo is the culprit. 3 new psus do not change the orange led. all 3 use pin 13 for power on, 24 plus 16 pin connectors. is there such a thing as a 16 pin point to point ats connector extention? I can find a 24 but the 16 seems not to exist. to finish my last project I needed to cut and splice the 16 pin to make it longer by 8 inches or so. I needed to move the psu to an unusual location since I was using a large DELL mobo and the HP case was not tall enough. Any sources for the extention welcome.Comment
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Re: dell psu
If the pins are physicaly compatible, you can cut the extra ones.Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts
Exclusive caps, meters and more!Hardware Insights - power supply reviews and more!Comment
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Re: dell psu
I cut and spliced the 9 wires in the 16 pin so it would reach. I have no idea of which wires are used. So I kept it the same. I also used a 24 pin extension. Nest time I will try to make a 16 pin out of the 24 pin and see if it fits Each opening alternates between a round and "D" shape. It may not be possible.Comment
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Re: dell psu
Yeah that's what I meant, cut the extra pins on extender.Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts
Exclusive caps, meters and more!Hardware Insights - power supply reviews and more!Comment
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Re: dell psu
I made my 16 pin extension out of a 24. Since the 24 is point to point more wires than I need but the needed wires are also there. Last extension at hand. Hopefully I willnot need to do this again. I have more 16 pin PSUs that are dead. Make good hosts for connectors.Comment
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Re: dell psu
So they realyl have it has same pins as are in main ATX connector of version 2.3, just there is less of them? It may sound strange I ask all the time, but the pins are not all same as you can see and if you change their position, you get proprietary non-standard connector which could not be plugged into ATX. It is not that uncommon.Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts
Exclusive caps, meters and more!Hardware Insights - power supply reviews and more!Comment
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