Dell Precision 5820 H950EF-00 Power Supply output

[Junior-gbb]

Could someone help me with this psu pinout? I replaced my old motherboard and now I have one amber blink followed by a short pause, two white blinks, a long pause, then repeats (Bad Motherboard, Power Supply, or Power Supply cabling)

 

[Bill_Bright]

We don't really have enough information.

Is the replacement motherboard and exact model replacement? This is really important because Dell is notorious for using proprietary (non-ATX compliant) components.

Are the images above of the same PSU? This matters too since again, Dell is notorious for using modified or "proprietary" parts. That means if the motherboard does not comply with the industry standard ATX Form Factor, it is likely the original PSU does not either. And that means any replacement PSU MUST come from Dell.

Why did you replace the original motherboard? Where are you seeing these amber and white LED blinks?

While possible, it is not likely the new motherboard faulty. Conclusively testing power supplies is impossible for the normal user because that takes sophisticated (and expensive) test equipment and the knowledge and skills to use them. You cannot conclusively test a PSU with a multimeter because proper testing requires measuring under a variety of realistic loads, and most multimeters cannot test for ripple and other AC anomalies riding the DC voltage.

So for most users (amateurs and pro alike), swapping in a known good supply is typically the best way to test a PSU. The problem there is, once again, Dell frequently uses proprietary PSUs.

That leads us to PSU cabling. While Dell does not typically use proprietary voltages, they are known for using cables that are NOT wired according to the ATX Form Factor standard. This means, if not the correct proprietary PSU for the proprietary motherboard, the wrong voltage could be applied to the wrong pin on the motherboard and sadly, that could result in damage to the motherboard.

 

[qxp]

The power supply will not produce all the voltages when just plugged in - it waits for the signal to power on.

The easy thing is to double check whether all the cables are plugged in.

 

[azrael]

From what I can tell from the pictures the connectors aren't the same, so it seems to be two different PSUs. If that's the case, then one of them is missing quite a few outputs.

BTW, all big manufacturers tend to use custom parts instead of off-the-shelf ones. Thinking of Dell, HP, Lenovo and Fujitsu here. Great way to keep you in their walled garden for replacement parts. Of course they'll tell you it's because everything works better this way. Intel actually tries (or has tried?) to push something similar with the ATX12VO spec.

 

[Panther_Seraphin]

From what I can tell from the pictures the connectors aren't the same, so it seems to be two different PSUs. If that's the case, then one of them is missing quite a few outputs.

BTW, all big manufacturers tend to use custom parts instead of off-the-shelf ones. Thinking of Dell, HP, Lenovo and Fujitsu here. Great way to keep you in their walled garden for replacement parts. Of course they'll tell you it's because everything works better this way. Intel actually tries (or has tried?) to push something similar with the ATX12VO spec.

They are the same PSU, its just 2 pics with the PSU flipped

Could someone help me with this psu pinout? I replaced my old motherboard and now I have one amber blink followed by a short pause, two white blinks, a long pause, then repeats (Bad Motherboard, Power Supply, or Power Supply cabling)

Have you changed the Motherboard with the exact same board AND revision number? Or are you trying to change to a different motherboard type?

 

[Junior-gbb]

They are the same PSU, its just 2 pics with the PSU flipped


Have you changed the Motherboard with the exact same board AND revision number? Or are you trying to change to a different motherboard type?

Thanks for the reply. Yes it is the same psu just flipped. The new motherboard is exactly the same, same model. When I try to turn it on without memory, processor or open case, the power blinks indicate the correct error codes.
This motherboard has a third connector for the PSU so I can't test it on another motherboard. (see 13, 21 and 11 in the System board components link)

Dell Precision 5820 Tower Owner's Manual | Dell US

https://www.reddit.com/r/pikvm/comments/1dvo377

 

[Junior-gbb]

From what I can tell from the pictures the connectors aren't the same, so it seems to be two different PSUs. If that's the case, then one of them is missing quite a few outputs.

BTW, all big manufacturers tend to use custom parts instead of off-the-shelf ones. Thinking of Dell, HP, Lenovo and Fujitsu here. Great way to keep you in their walled garden for replacement parts. Of course they'll tell you it's because everything works better this way. Intel actually tries (or has tried?) to push something similar with the ATX12VO spec.

They are the same PSU, its just 2 pics with the PSU flipped

 

[Junior-gbb]

We don't really have enough information.

Is the replacement motherboard and exact model replacement? This is really important because Dell is notorious for using proprietary (non-ATX compliant) components.

Are the images above of the same PSU? This matters too since again, Dell is notorious for using modified or "proprietary" parts. That means if the motherboard does not comply with the industry standard ATX Form Factor, it is likely the original PSU does not either. And that means any replacement PSU MUST come from Dell.

Why did you replace the original motherboard? Where are you seeing these amber and white LED blinks?

While possible, it is not likely the new motherboard faulty. Conclusively testing power supplies is impossible for the normal user because that takes sophisticated (and expensive) test equipment and the knowledge and skills to use them. You cannot conclusively test a PSU with a multimeter because proper testing requires measuring under a variety of realistic loads, and most multimeters cannot test for ripple and other AC anomalies riding the DC voltage.

So for most users (amateurs and pro alike), swapping in a known good supply is typically the best way to test a PSU. The problem there is, once again, Dell frequently uses proprietary PSUs.

That leads us to PSU cabling. While Dell does not typically use proprietary voltages, they are known for using cables that are NOT wired according to the ATX Form Factor standard. This means, if not the correct proprietary PSU for the proprietary motherboard, the wrong voltage could be applied to the wrong pin on the motherboard and sadly, that could result in damage to the motherboard.

Thanks for the answers

Yes, the new motherboard is the same model

Yes, they are from the same PSU face up and face down.

My old motherboard fried some transistors and didn't turn on anymore

Respectfully and in my humble opinion I think a multimeter is enough to start testing.

Yes, the simplest option would be to buy another PSU. But if I buy a used one and it doesn't work, then the problem is either the PSU or the motherboard. Or I could buy a new one from Dell for the same price as a new computer.

 

[SiggiTheHun]

Dell DP/N 03W8F7 --- 425W, working in my Precision T5820:

Re: your pic DSC07831 (PSU Label down)

0,563_____11,72 (Fans turns OFF when connected to multimeter)
0,066_____16,85
4,91______11,92
0,069_____16,9
0,068_____11,92
0,068_____11,92
0,071_____11,92

11,58_____11,59

0__________0

0__________0

0__________0

0__________0

*************************************
Re: your pic DSC07829 (PSU Label top)

0__________0

0__________0

0__________0

0__________0

11,58_____11,58

0,015_____11,92
0,067_____11.92
0,068_____11,92
0,068_____16,9
4,91______11,92
0,066_____16,85
0,564_____11,72 (Fans turn OFF when connected to multimeter)

As in your pictures:
LEFT column - test switch OFF________RIGHT column - test switch ON

Hope this helps.

 

[Junior-gbb]

Dell DP/N 03W8F7 --- 425W, working in my Precision T5820:

Re: your pic DSC07831 (PSU Label down)

0,563_____11,72 (Fans turns OFF when connected to multimeter)
0,066_____16,85
4,91______11,92
0,069_____16,9
0,068_____11,92
0,068_____11,92
0,071_____11,92

11,58_____11,59

0__________0

0__________0

0__________0

0__________0

*************************************
Re: your pic DSC07829 (PSU Label top)

0__________0

0__________0

0__________0

0__________0

11,58_____11,58

0,015_____11,92
0,067_____11.92
0,068_____11,92
0,068_____16,9
4,91______11,92
0,066_____16,85
0,564_____11,72 (Fans turn OFF when connected to multimeter)

As in your pictures:
LEFT column - test switch OFF________RIGHT column - test switch ON

Hope this helps.

Thank you so much SiggiTheHun. You are the first person who understood what I really needed.

But pic DSC07829 is the other side of the psu, with only 6 pins

I think my voltage is correct on the 4 widest pins (0v to 12v)

 

[DTB Radio]

I just acquired one of these. With the power supply upside down (label down), I tied the third pin from the right to ground through a 100-ohm resistor to turn the supply on. Hope this helps. This pin corresponds to the pin labeled 4.51 in your first photo in the OP.

Here is what I did for reference. Sorry for the blurry photo, could not get the phone to focus for some reason.