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  #1  
Old 04-21-2014, 06:36 PM
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Default New PSU (RM1000) - Case fans remain lit after PC shutdown

Hi all, new member here, just signed up to see if anyone can offer any advice. :)

I've just replaced my trustly old 700W OCZ power supply with a Corsair RM1000 with the thought I may go SLI down the line. Anyway, that's the only thing that has been changed in my system.

Previously, when I would shut down my PC, the led on the front of the fan controller would remain lit. I've installed the RM1000 and it seems to be working great however, after shutting down the system, all my case fans (6 of them) remain lit although they are quite dim. They are not spinning, the system has definitely shut down but the leds are still on and this seems and looks a bit odd to me. Is it normal?

What I've tried so far:

I shutdown my PC and switched OFF the PSU from the switch at the back of the tower/PSU. The fan led lights remain ON. After 5 minutes of waiting, the fan lights are still ON. I've opened the case and tried different ports on the PSU and when I unplug the cable from PSU, the fan lights go off, but as soon as I plug it back into the PSU (tried all the ports) the fan lights come back ON. This is all while the PSU is switched OFF from the back.

As I said, the PSU seems to be working fine. Just wondering if the above is something I should be concerned about?

Another thing is, I know that the PSU fan doesn't spin unless at around 40% load. I've played games and tried benchmarks and it doesn't spin at all. I've just ran prime 95 and furmark together which stressed the CPU and GPU massively sending GPU temps up to over 80C and CPU temps to over 60C and after around 5 minutes my system crashed. It's never crashed before but at no point did the PSU fan even move. Is this normal?

Last edited by AdzUK; 04-26-2014 at 07:41 AM.
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Old 04-21-2014, 07:21 PM
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First off, you're using a 1000W PSU with only one graphics card. If you fire up Link (since that PSU actually came with the Link dongle) and look at your +12V load, I bet it's probably under 400W. So I doubt that fan will ever turn on.

As for the fans: What are the fans plugged into? The fan controller? The motherboard? Directly into the PSU? I don't think that part was made clear.
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Old 04-21-2014, 07:33 PM
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Hi there.

My case has 6 led fans and they are all plugged into the fan controller. The fan controller is powered by the psu via molex cable.

When I remove that cable from the psu the fan lights go off. If I just switch the psu off from the back and even remove the power lead, the case fans remain lit.

Im just going bed now and I've shutdown the pc, and also switched off the psu from the back. Will see in the morning if the fans are still lit, I can't understand where they are getting power from?
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Old 04-21-2014, 08:04 PM
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They won't be. Eventually the capacitors will drain.

Capacitors, by their very nature, store energy. See, your 700W had capacitors only large enough to keep the fan controller lit up for a while. This 1000W has enough capacitance to keep the fan controller AND the fans lit up for quite some time.
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Old 04-22-2014, 03:07 AM
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Well 6-7 hours later and I can confirm the fan lights are still on. I'm off to work now, I'll check again in 8 hours.

Anyone else ever had this?
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Old 04-22-2014, 04:02 AM
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Quote:
Originally Posted by jonnyguru View Post
They won't be. Eventually the capacitors will drain.

Capacitors, by their very nature, store energy. See, your 700W had capacitors only large enough to keep the fan controller lit up for a while. This 1000W has enough capacitance to keep the fan controller AND the fans lit up for quite some time.
are you sure you know what you are talking about, because this sounds like a load of nonsense...



it sounds like a dodgy psu, a quick google shows others reporting similar, see here also:

http://www.techrepublic.com/forums/q...ter-shutdown/#.

http://answers.microsoft.com/en-us/w...e-5d237c12520e



it's a dodgy psu...

is your hdd light still on? (assuming you plugged the led connectors the right way round on the motherboard :p)

Last edited by Azh; 04-22-2014 at 11:58 AM.
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  #7  
Old 04-22-2014, 11:47 AM
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Just got home from work, its 4.45pm and I can confirm the fan led lights are... STILL ON!

This is despite me switching the PSU off from the switch at the back ~17 hours ago. If my fans didn't have any leds I wouldn't even have known there was an issue? Can someone please advise whether this is normal. I understand the capacitors have stored energy and the power obviously has to come from somewhere, but 17 hours later and they are still on???

Azh - thanks for those links I'm gonna read through them now.
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Old 04-22-2014, 12:26 PM
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Have you tried taking the plug out of the socket?
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Old 04-22-2014, 12:29 PM
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Quote:
Originally Posted by thenosbod View Post
Have you tried taking the plug out of the socket?
Yes - well I unplugged the lead from the back of the PSU so same thing. The fan led lights remain on.

The only time the fan lights go off is when I unplug that molex cable which is plugged into the fan controller, from the PSU. If I remove that cable then the lights go off. Soon as I put it back in (I've tried all the ports on the PSU) the lights come back on.
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Old 04-22-2014, 12:36 PM
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Quote:
Originally Posted by Azh View Post
are you sure you know what you are talking about, because this sounds like a load of nonsense...
Thanks for the vote of confidence.

Do you think DC power comes from thin air?

Quote:
If I just switch the psu off from the back and even remove the power lead, the case fans remain lit.
If the lights stayed lit when the switch was turned off, but then went out when the plug was pulled, I would say faulty switch. Get an RMA.

But he's killing ALL AC power to the PSU by pulling the plug. Yet there's still DC power coming from the PSU. Why?

A larger capacity PSU has larger capacitors. The bulk cap is larger to maintain a specified hold up time if there's a brown out and there are more and larger capacity secondary capacitors to filter out ripple even at higher loads.

The fan controller probably uses FETs instead of resistors to control the voltage to the fans, which is way more efficient, but can still leak through a little bit of juice to the fans causing the LEDs to shine just a little bit and yet never fully drain the capacitors in the PSU.

I bet if you plug the fans directly into the PSU without the fan controller, those fans would only stay lit up for a second because it's a more resistive load than the fan controller.

Last edited by jonnyguru; 04-22-2014 at 12:42 PM.
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Old 04-22-2014, 12:44 PM
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I don't think it is the switch jonnyguru
they would go off when he unplugged the lead from the back of the psu?

Quote:
Originally Posted by AdzUK View Post
Yes - well I unplugged the lead from the back of the PSU so same thing. The fan led lights remain on.

The only time the fan lights go off is when I unplug that molex cable which is plugged into the fan controller, from the PSU. If I remove that cable then the lights go off. Soon as I put it back in (I've tried all the ports on the PSU) the lights come back on.
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Old 04-22-2014, 12:49 PM
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Quote:
Originally Posted by thenosbod View Post
I don't think it is the switch jonnyguru
they would go off when he unplugged the lead from the back of the psu?

Quote:
Originally Posted by AdzUK View Post
Yes - well I unplugged the lead from the back of the PSU so same thing. The fan led lights remain on.

The only time the fan lights go off is when I unplug that molex cable which is plugged into the fan controller, from the PSU. If I remove that cable then the lights go off. Soon as I put it back in (I've tried all the ports on the PSU) the lights come back on.
Yeah. That's why I did the edit. I thought I misread the post, thinking the plug was pulled and the lights went out. Then I re-read it and found that he pulled the plug and the lights stayed on.

So Azh apparently thinks Corsair has created a PSU with wireless power capabilities and that we're creating DC power out of thin air.
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Old 04-22-2014, 01:01 PM
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Are there any high voltage cables or radio transmitters near you?
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  #14  
Old 04-22-2014, 01:06 PM
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Quote:
Originally Posted by jonnyguru View Post
Yeah. That's why I did the edit. I thought I misread the post, thinking the plug was pulled and the lights went out. Then I re-read it and found that he pulled the plug and the lights stayed on.

So Azh apparently thinks Corsair has created a PSU with wireless power capabilities and that we're creating DC power out of thin air.
I thought you were off your head, but now I know you are

Quote:
See, your 700W had capacitors only large enough to keep the fan controller lit up for a while. This 1000W has enough capacitance to keep the fan controller AND the fans lit up for quite some time


read this dribble you posted and try not to laugh at the same time


I'm bringing some popcorn, :D maybe you'll bring some sensible suggestions to the table, I wont hold my breath though


the OCZ 700w behaves normally, switches all devices off instantly when the system is shut down
the faulty Corsair 1000w keeps the fan leds on (god knows what else)

what could it be??? lol

Last edited by Azh; 04-22-2014 at 01:11 PM.
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  #15  
Old 04-22-2014, 01:11 PM
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I appreciate all the replies guys, gives me food for thought. :)

I am going to try plugging 2 fans directly into the motherboard and leaving the other 4 in the fan controller and seeing what happens.

As I said, if these fans had no led I wouldn't have even known there was an issue as they stop spinning, and everything appears to shut down as normal it's just the lights remain on - albeit very dim.

Oh and there are no high voltage cables or radio transmitters near me.

Edit: Keep it sensible Azh... :)

Last edited by AdzUK; 04-22-2014 at 01:14 PM.
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