Quantcast

Maximum PC

It is currently Wed Aug 20, 2014 1:24 am

All times are UTC - 8 hours




Post new topic Reply to topic  [ 7 posts ] 
Author Message
 Post subject: Can Anyone Change Fan Lights???
PostPosted: Fri Apr 12, 2013 9:06 am 
Coppermine
Coppermine

Joined: Mon Oct 12, 2009 4:47 am
Posts: 686
I have two 120mm fans in front of my pc and the green light is blinking, not steady. Don't really like the blinking light. Whatever is making it blink is IN the fan itself. Does anyone know how to disable the blink so I can enjoy just a steady light???


Top
  Profile  
 
 Post subject: Re: Can Anyone Change Fan Lights???
PostPosted: Fri Apr 12, 2013 9:30 am 
Smithfield
Smithfield

Joined: Sun Jun 18, 2006 7:37 pm
Posts: 5205
You can't because it's hard-wired. It's a fault of the electronics chosen.


Top
  Profile  
 
 Post subject: Re: Can Anyone Change Fan Lights???
PostPosted: Fri Apr 12, 2013 4:28 pm 
Team Member
Team Member

Joined: Wed Aug 12, 2009 12:09 pm
Posts: 565
LatiosXT wrote:
You can't because it's hard-wired. It's a fault of the electronics chosen.


What part is causing the blink? Fan led doesn't sound like complicated design.


Top
  Profile  
 
 Post subject: Re: Can Anyone Change Fan Lights???
PostPosted: Fri Apr 12, 2013 4:38 pm 
Coppermine
Coppermine
User avatar

Joined: Mon May 16, 2005 7:06 pm
Posts: 619
Location: San Antonio
Often the electronics are built right into the LED. If you have ever installed LEDs that change color, you know there is only the LED and perhaps a current limiting resistor. If you want to change from blinking to steady, you are going to have to change the LED. It's not too hard, but some LEDs are epoxied or are cast into the frame of the fan. Those ones are tougher. It may be easier to change the entire fan.


Top
  Profile  
 
 Post subject: Re: Can Anyone Change Fan Lights???
PostPosted: Fri Apr 12, 2013 5:09 pm 
Smithfield
Smithfield

Joined: Sun Jun 18, 2006 7:37 pm
Posts: 5205
Science lesson everyone!

Electric motors work on the reverse principle of an electric generator. Basically an electric generator requires you to move a magnet around some wire. The faster you move the magnet, the more current you generate. In an electric motor, a current passes through some wire and creates a magnetic field, which opposes against some magnets, creating motion. The more current you have, the stronger the magnetic field and thus the stronger the opposition against the magnets inside.

So what does this have to do with an LED blinking? It turns out that electric motors create draws pulses of current. This is just part of the electric motor design. A smart electrical engineer would have the LEDs and motor wired parallel. A cheap electrical engineer would just wire them in series. Since there are times when there's no current drawn (because the electric motor isn't drawing current), the LED can't be turned on.

So yeah, unless you know what you're doing, it's probably better to just get another fan that doesn't have this problem.


Top
  Profile  
 
 Post subject: Re: Can Anyone Change Fan Lights???
PostPosted: Fri Apr 12, 2013 5:17 pm 
Team Member
Team Member
User avatar

Joined: Sat Apr 21, 2007 6:57 am
Posts: 1161
LatiosXT wrote:
Science lesson everyone!

Electric motors work on the reverse principle of an electric generator. Basically an electric generator requires you to move a magnet around some wire. The faster you move the magnet, the more current you generate. In an electric motor, a current passes through some wire and creates a magnetic field, which opposes against some magnets, creating motion. The more current you have, the stronger the magnetic field and thus the stronger the opposition against the magnets inside.

So what does this have to do with an LED blinking? It turns out that electric motors create draws pulses of current. This is just part of the electric motor design. A smart electrical engineer would have the LEDs and motor wired parallel. A cheap electrical engineer would just wire them in series. Since there are times when there's no current drawn (because the electric motor isn't drawing current), the LED can't be turned on.

So yeah, unless you know what you're doing, it's probably better to just get another fan that doesn't have this problem.


This could very well be the case, or the OP could have them attached to a Pulse Width Modulation controller, which works by cycling the electricity on and off really quick. This can also cause LEDs to blink or flash.


Top
  Profile  
 
 Post subject: Re: Can Anyone Change Fan Lights???
PostPosted: Fri Apr 12, 2013 5:33 pm 
Smithfield
Smithfield

Joined: Sun Jun 18, 2006 7:37 pm
Posts: 5205
nsvander wrote:
This could very well be the case, or the OP could have them attached to a Pulse Width Modulation controller, which works by cycling the electricity on and off really quick. This can also cause LEDs to blink or flash.

There is no PWM. I've had 3-pin case fans that did this. It's because the electric motor is causing blips of current draw.


Top
  Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 7 posts ] 

All times are UTC - 8 hours


Who is online

Users browsing this forum: AlexHeu and 8 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group