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LED Case Fan Spins but No LED Light

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  • Cases
  • Fan
  • Components
  • LED Monitor
Last response: in Components
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July 25, 2014 11:55:08 PM

This is weird, I bought a Core V71 case by Thermaltake and I love it so far, it has 3x200mm fans that are connected to a sort of a onboard fan controller with 4 options, 1) LED on 2) led off 3) high fan 4) low fan. The problem is that even on high fan they aren't getting the full power because when I connect these fans direct to the PSU or mobo, they blow much faster and cooler, so Im going to bypass the onboard controller and connect these straight to power but then the fans LED aren't lighting up? what gives, if i plug into the fan controller the LED is on, but on mobo or PSU using molex, they blow full speed but no LED, these are 3 pins btw, shouldn't they light up when plugged to any source, or did thermaltake do something special to these fans?? has anyone heard of something like this

More about : led case fan spins led light

July 26, 2014 12:11:48 AM

You're probably not connecting them up right.
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July 26, 2014 12:26:31 AM

I mean how else can you not connect these right? You plug them into the 3 pin hole, they work fine on fan controller but on the mobo and psu they spin full blast but don't light up, impossible to be a connection issue, thank you but anyone else?
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July 26, 2014 12:37:54 AM

Don't go through the controller. Disconnect the leds from the controller. Just plug them into a Molex
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July 26, 2014 12:40:28 AM

Or are they leds in/on the fan? In that case you have to disconnect them from the fan power circuit and feed the fans and leds seperately.
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July 26, 2014 1:02:39 AM

the fans themselves have leds on them, they are Thermaltake Pure 20 Led, seen here http://www.newegg.com/Product/Product.aspx?Item=N82E168..., when you say disconnect the fan power circuit and feed the fans and leds seperately, how would i do that, what kind of cable? you mean mess with the 3 pin cable the fan is attached to? im kind of trying to get what you mean
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July 26, 2014 1:56:37 AM

I gather the controller supplies less than 12V when maxed out. So you can't get max LED brightness or Fan speed?

The fans are rated at 12v, so you should be able to just run them from 12v molex to fan connectors.

I gather you just ground the third pin to get the LED on and off. If so, at low fan speed (low voltage) the led would only come on at low voltage/brightness too. But if you apply separate power to the third pin to turn on the lED then you should be able to do that with a rheostat to change the led brightness.

That'd mean ground permanently to one pin and seperate variable voltage sources to the other two pins. The controller only cranks out less than 12v max. You could make your own that would run up to 12v

Or try another fan controller.
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July 26, 2014 2:00:35 AM

go into Bios and turn the fan to full power. then your software can control it. probably because MB limit the power to the Fan.
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July 26, 2014 9:27:07 AM

"I gather the controller supplies less than 12V when maxed out. So you can't get max LED brightness or Fan speed?"

Yes I believe that's exactly what's going on

"The fans are rated at 12v, so you should be able to just run them from 12v molex to fan connectors."

I have done this, but lose the light

"I gather you just ground the third pin to get the LED on and off. If so, at low fan speed (low voltage) the led would only come on at low voltage/brightness too. But if you apply separate power to the third pin to turn on the lED then you should be able to do that with a rheostat to change the led brightness.

That'd mean ground permanently to one pin and seperate variable voltage sources to the other two pins. The controller only cranks out less than 12v max. You could make your own that would run up to 12v"

How do I go about doing this? do i have to open up the 3 pin cable?

"Or try another fan controller."

I would have to take out a drive bay im trying to resolve this without replacing the stock fan controller, just want to bypass it


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July 26, 2014 4:17:12 PM

How is the fan controller powered?

Did you get any info with the case about the controller?

Have you asked Thermaltake?
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July 26, 2014 4:33:18 PM

happen to me with my controller ... you need to go into Bios and set the fan to full, max ... then the control will take over and you can adjust .
if your setting in bios is standard then the fan control only get what ever the voltage send to controller because of your computer condition at that time ... most of the time it way low.
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July 26, 2014 4:36:04 PM

Depends how the controller is powered. It's probably not powered from the motherboard but straight from the psu via a molex connector.
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July 26, 2014 5:55:50 PM

i7Baby said:
How is the fan controller powered?

Did you get any info with the case about the controller?

Have you asked Thermaltake?


I emailed them, waiting on response :) 
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