Mx17R4 gpu fan connection alternative.

Discussion in 'Alienware 17 and M17x' started by rband, Nov 7, 2018.

  1. rband

    rband Notebook Enthusiast

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    The Jfan2 connection ripped off the board , is there an alternative place to draw power for the gpu fan?
     
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  2. SMGJohn

    SMGJohn Notebook Evangelist

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    LOL, are you not able to solder it on again?
    Also even if you draw power from somewhere else means the fan will run at max speed constantly unless you stretch cable to same connector for Jfan1
     
  3. t456

    t456 1977-09-05, 12:56:00 UTC Moderator

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    Sure, any 5V supply that can handle at least 0.5A will do. Soldering the voltage wire to one of the USB port connectors is a good solution.

    But why not just solder all fan wires directly to the Jfan2's solder pads? You have to solder the rpm wire anyway since most systems will auto-shutdown when there's no 'fan=spinning' signal.
     
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  4. rband

    rband Notebook Enthusiast

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    I was going to solder the connector back to the board but the pads are ripped right off the board and some of the wires are exposed , not an option anymore.
    What color is the rpm wire on the fan?
     
  5. t456

    t456 1977-09-05, 12:56:00 UTC Moderator

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    Usually rpm is yellow (and blue for pwm). Some Dells have 5 pins, but those have a double ground (twice black). You also have to consider speed control; leave out pwm and it will run 100% full time. If that's not an issue then all is fine, but otherwise you'll have to solder the pwm as well or, if that pad is damaged too, strip a bit of plastic from the cpu's pwm wire and solder the gpu pwm wire to that exposed bit. They'll run in sync, but that's perfectly fine; when the gpu is loaded then so will the cpu, so this combination will merely result in the gpu fan spinning up occasionally when it isn't really necessary (cpu load only).
     
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  6. rband

    rband Notebook Enthusiast

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    Great info , thanks t456.
     
  7. cdoublejj

    cdoublejj Notebook Deity

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    you can usually just solder wires to where ever the fan header traces go to then solder a new or the old fan header to those wires. Louis Rossmann does it all the time on youtube.
     
  8. rband

    rband Notebook Enthusiast

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    Thanks for the suggestion , but he only does Macs?
     
  9. cdoublejj

    cdoublejj Notebook Deity

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    i've seen him do audio equipment and a few other things the same way. all those "Traces" on the board are is wires. you can follow it to see where it goes / where it connects to and run new wires from there.
     
  10. VoodooBane

    VoodooBane Notebook Consultant

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    There is no difference what what rossman repairs which is macbooks to other computers. All laptop have the same design layout as far as how thing connect via all the traces. If u can life with the fan going 100% jist try to find thr positive and neg wires traces. I thing they are the red and black. Both of those wire are the 2 outside wires on thr connector the 2 mids are pwm and w/e

    Sent from my SAMSUNG-SM-G928A using Tapatalk
     
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