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Cooling Is this fan broken?

Discussion in 'Hardware' started by Wicked_Sludge, 16 Dec 2012.

  1. Wicked_Sludge

    Wicked_Sludge My eyes! The goggles do nothing!

    15 Aug 2010
    Likes Received:
    So I am having some problems with my home theater projector. I am using an oscilloscope to attempt to verify the fans are all working correctly but I am a bit confused by what I am seeing.

    I was under the impression that fan tach outputs were a square wave equal to the fans input voltage, but having tested all 5 of the fans in this thing that's not quite what I am seeing. The only one that is "different" is this one:


    Compare that to this one which is more or less what the other four fans look like:


    Is the fan in question bad? Would that extra "dip" be enough to make the control board think the fan has failed and shut the unit down?

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