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Non-standard PC PSU pinouts

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Non-standard PC PSU pinouts

Postby Behemot » June 15th, 2018, 1:34 am

Big T1 integrators like HP, Dell, Lenovo already started pissing about Intel's obsolete ATX connector standards and using 12V PSUs already (with +5/+3.3V VRMs on the MoBo only for the HDDs and ODDs), which creates some problems when these units die. They are often TFX or 1U units, but when you don't know the pinout, you cannot replace them with standard units utilising 20(+4)pin Main ATX. So lets take a look at those you come around.

First one is the Lenovo ThincCentre M93p, using FSP240-40SBV 80 PLUS Bronze rated units with only -12V and -12V outputs (and SB rail). This has 14pin main conenctor with only 12 pins used. It is the ordinary Molex Mini-Fit Jr. 5557-14R:
5557-14R.jpg
5557-14R.jpg (19.43 KiB) Viewed 494 times

- pins I, II and III are +12 V
- pin 4 is -12 V
- pins 5-6 are not conencted
- pins 7-10 are ground
- pin 11 is +5 V SB
- pin 12 is PWR Good
- pin 13 is PWR On
- pin 14 is a white wire, not sure what for, but likely +12V feedback
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