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  1. #1

    Member Since
    May 05, 2008
    "Buzzing" in Audio When second screen attached using VGA.
    This is related to this:

    I installed a new graphics card, a ATI Radeon 7500, in my old 2001 G4 Mac.
    It works well.

    I used a Belkin ADC to DVI adaptor and a DVI to DVI cable to connect my 19" Viewsonic VA1912w monitor. It works well.

    I have an iMic connected to a Yamaha sound system. The audio is fine.

    I connected the remaining VGA port on the ATI Radeon 7500 garaphic's card to my Sony Bravia HDTV's VGA port. I have two functioning screen on the Mac.

    However, when I connect the HDTV using the VGA cable I suddenly get a "buzz" interference noise on the sound system. Disconnect the VGA cable and the noise stops. Connect it, it comes back.

    A grounding problem? Any thoughts? Anyone else experienced this?

  2. #2

    hughvane's Avatar
    Member Since
    May 18, 2008
    Amberley, Canterbury, New Zealand
    MacMini 4.1, OS 10.11 and 10.6; Macbook Pro 8.2, OS 10.12, MacBook 4.1, OS 10.6.8
    It is nearly always a "grounding" issue. Tracing just where can be a tortuous process, but start by checking all devices in your setup to see that all are earthed properly. You may have a device that is double-insulated, thus not requiring an earth connection.

    The only other suggestions I can offer are:
    1. the VGA cable, that is apparently causing the interference, may be faulty. Have you tried another cable?
    2. the proximity of the Yamaha amplifier to the HDTV.

  3. #3

    Member Since
    May 05, 2008
    Sounds like I'm in for a fun time.

    I think I shall start by replacing the VGA cable. Currently i have two joined together to reach the HDTV. I''' see about getting a longer single cable and go from there.

    Many thanks for the "feedback".

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