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    White lines on external monitor

    Discussion in 'ASUS Gaming Notebook Forum' started by ilikeshovels, Apr 24, 2012.

  1. ilikeshovels

    ilikeshovels Newbie

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    I have white lines on an external monitor it when it is plugged in. The white lines disappear when I unplug the power supply. I have tried two different power supplies. What could be the issue?

    The power supplies I am using have these values:
    Input: 100-240V ~ 2.0A(2.0A) 50-60Hz
    Output: 19V --- 6.32A(6.32A) (-)--(--(+) Opening of circle faces (+)
     
    ilikeshovels, Apr 24, 2012
    #1
  2. namaiki

    namaiki "basically rocks" Super Moderator

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    Are you using VGA or DP/HDMI?
     
    namaiki, Apr 24, 2012
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  3. ilikeshovels

    ilikeshovels Newbie

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    Hey. I plugged in a DP/HDMI cable instead and the monitor stopped flickering. Perhaps since the power supply plugs in right next to the VGA input on the laptop there is some electrical issue?
     
    ilikeshovels, Apr 25, 2012
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  4. Sir Robin

    Sir Robin Notebook Geek

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    It sounds a little like you have a floating earth ground. By any
    chance, are you using a 2-prong to 3-prong AC power
    adapter on either the laptop or the monitor? VGA uses
    low voltage analog signaling to transmit the video. If one
    side is offset from the other, it can cause problems. Normally,
    the signal ground conductors, in the VGA cable are enough, but if
    the differential is too high, or the VGA cable is cheaply made, the
    signal ground conductors are overwhelmed. When you switch to
    battery operation, the laptop ground level will float to the level of
    the mating device. I believe HDMI uses DC blocking circuitry (and
    digital signalling), which helps eliminate the problem, even if there
    is a ground offset.

    Good luck,

    Sir Robin
     
    Sir Robin, Apr 25, 2012
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