Jump to content
Corsair Community

620W PSU missing -5V lead


Recommended Posts

My 620W Corsair power supply unit is missing the white lead for -5V (Pin 20 in http://pinouts.ru/Power/atx_v2_pinout.shtml). Is this normal, or do I need to return my power supply?

 

Currently, my mother board is not powering on. The Motherboard power LED comes on. Upon pressing the power button, the CPU fan turn very briefly, and then stops immediately. I noticed this when I was troubleshooting this problem.

 

I have disconnected everything except the Video Card. The problem continues to persist. My bare bones config is: ASUS P5W Deluxe Wifi Motherboard, Core 2 Duo Q6600, OCZ DDR2 800 RAM (1MB x4).

 

Is there any suggestion that you may have on how I should troubleshoot this?

Link to comment
Share on other sites

That's normal. The -5volt rail has been steadily phased out because it hasn't been used to power anything in a long time. It used to power early generation progammable read only memory chips on old boards and ISA bus cards (think AT systems and early generation ATX). As to the system failing to boot, here's a couple of links thay might help:

 

http://www.xtremesystems.org/forums/showthread.php?t=112648

 

http://www.madshrimps.be/?action=getarticle&articID=508

 

Good luck.

Link to comment
Share on other sites

  • 3 weeks later...
My 620W Corsair power supply unit is missing the white lead for -5V (Pin 20 in http://pinouts.ru/Power/atx_v2_pinout.shtml). Is this normal, or do I need to return my power supply?

 

Currently, my mother board is not powering on. The Motherboard power LED comes on. Upon pressing the power button, the CPU fan turn very briefly, and then stops immediately. I noticed this when I was troubleshooting this problem.

 

I have disconnected everything except the Video Card. The problem continues to persist. My bare bones config is: ASUS P5W Deluxe Wifi Motherboard, Core 2 Duo Q6600, ******** DDR2 800 RAM (1MB x4).

 

Is there any suggestion that you may have on how I should troubleshoot this?

 

I have the same problem with my older PC after putting in a new PSU. While the -5v is not used these days, some board seems to refuse power-on if it detects -5v is missing. Try an old junk PSU with -5v just to see it would power up.

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

×
×
  • Create New...