Want all case fan LEDs to go off on "sleep mode"

[sarmstrong806]

Case: Cooler master elite 430

Motherboard: GIGABYTE GA-A75-UD4H FM1 AMD A75 (Hudson D3)

Currently the in case fan LEDs turn off when the monitor goes to sleep (its plugged into the sys fan port on mobo)

I want to add these Rosewill LED fans

Obviously some of them will need to go directly to the PSU through molex adapters since there are not enough spots on the mobo.

My question is that what dictates whether the fan LEDs turn on or off. Will they do the same if they are directly into the PSU?

How can I rig this setup so that all fan LEDs go dark at night.

 

[HugoStiglitz]

This is going to be a tough job.

the LED's draw their power from the same wire that runs the fan itself.
easiest is going to be joining them together and run off a 4pin PSU connector.
rig up a switch after they are together and b4 the 4pin connector and then you can turn them off at will (will turn off the LED and the FAN)

you will not be able to control the speed this way (on full speed all the time)

other option is to add a fan controller that has an off setting for the fans.
that way you can control the speed and turn them off when needed.
something like below (dont know if it supports fans totally off)
http://www.newegg.com/Product/Product.aspx?Item=N82E16811998065

as for an automatic TURN off when computer enters sleep. there is no such thing.

Have you considered hibernate rather than sleep. that way no matter how you plug the fans in (via 4pin Molex or using the 3pin fan header) they will turn off when the system hibernates.

 

[HugoStiglitz]

btw there is no easy way to seperate the LED power from the FAN power (to have the fan on and the LED off)

 

[HugoStiglitz]

the fan controler in my first post DOES NOT support fully off for it's fans.

the one below does
http://www.newegg.com/Product/Product.aspx?Item=N82E16811998038
also has temp probes and digital display for RPM and temperature.

 

[sarmstrong806]

Ahh, yes hibernate. The fan is not turning off now because I removed hibernate for SSD tweak, so that must have been it.

I thought of buying a 6 fan controller for the 5.25" bay, but turning them off and on would be annoying.

I may just use hibernate if that will shut off all fans (or hopefully at least the LEDs).

I guess I could test mobo header vs. PSU to see what happens.

My room has no windows so you can imagine why this is critical.

 

[popatim]

The fans and light should shut off when the pc goes to sleep as the only thing running would be the 5v standby. I dont beleive mine fan led's turn off when the monitor goes to sleep and dont see how they could if they're attached to the motherbd, theres no seperate line for led control.

 

[sarmstrong806]

But I don't think I disabled sleep. I just disabled hibernate.

Let me check my power plan settings.

 

[sarmstrong806]

So I set sleep to 1 minute and the case LED did turn off.

I guess I will need to see whether a Molex PSU fan will behave the same way, since the one LED fan is connected to the "sys fan" header.

Otherwise I could split my mobo headers to power all fans.

 

[HugoStiglitz]

Be carefull the load you put on the fan header on ur motherboard when trying to run all fans off the same header.

do you have any other spare fan headers on ur motherboard (i would try with 2 fans on the header and use 2 headers)

Directly connecting the fans to the PSU will result in them not turning off when the system sleeps.
if they are connected to the mobo this may work

hibernate will work even if they are directly connected to the PSU

 

[sarmstrong806]

I have 3 fan headers, 6 fan bays. I think I'm going to go that route.

Those Rosewill 120mm LEDs don't seem heavy duty to the extent they would overload one header.

 

[popatim]

Sleep mode turns off the the main psu ails so I dont see how any fans would stay on unless its a special bios option or something, the only thing that has power is the 5v standby circuit in S3 (sleep)

 

[sarmstrong806]

Well then I will hook an LED to the molex to test that theory before I buy new connectors!

Thank you guys for the help.