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.