Dell ultra 7070 ,Foxconn PWM laptop case fan. Spins at 100% speed in failure mode.

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  • kleung
    Senior Member
    • Jun 2012
    • 72
    • Canada
    #1

    Dell ultra 7070 ,Foxconn PWM laptop case fan. Spins at 100% speed in failure mode.

    I wanted to add to the knowledge base about a PWM case fan that it can fail at 100% speed.


    On my Dell ultra 7070 (this is a 0.6 L pc so uses laptop parts); I had the case fan suddenly go 100% and I couldn't control it. I disconnected/reset bios and it was only solved when I swapped in a replacement fan.

    I have tested and there is continuity between the 4 wires pins and the circuit board.

    That is the extent of my troubleshooting. I took pictures of the circuit board but don't know what component would die (PWM controller?) that could cause this to happen.

    I've never heard of this before as I would expect a fan to fail at 0% spin speed; not 100%.


    If anyone has any ideas, that would be appreciated.

    The fan is a Foxconn DC Brushless Fan
    Model PVB060B05H
    DC 5v 0.78 A
    5.49 cfm min 65vxf-a00
    2 Photos
    Tags: None
    • kotel studios
      Senior Member
      • Dec 2024
      • 140
      • Poland
      #2
      Maybe bad solder joints? Just a wild guess...

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