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HDTV has no "Analog Audio Output"

Discussion in 'Misc Electronics' started by Biggy, Feb 5, 2006.

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  1. Biggy

    Biggy Guest

    Hi Guys

    My friend has a 42" LG Plasma HDTV (DU 42PX12X) it has only one audio put
    via digital "optical" output. I am trying to help him connect it to his
    amplified speaker system. The HDTV has one extra monitor RCA audio output
    but only works when you are watching standard TV and processor disconnects
    it on HDTV channels.

    Checked with LG Electronics who advised as follows:

    (1) When receiving digital TV signal then no analogue audio signal available
    from Monitor-Out, RCA connections
    (2) When receiving analogue TV signal then yes analogue audio signal
    available from Monitor-Out, but need to turn off internal speakers
    (3) Digital audio output available at Digital Audio Output (Optical)

    I would have thought that it would be fairly simple matter to capture the
    analogue audio signal at the internal speakers, irrespective of whether the
    TV signal is digital or analogue.

    I was thinking of trying to open the set and tapping off the speakers left
    and right with a simple voltage divider. I could ever make it a variable
    attenuator. Only problem is I don't have a schematic I want to make sure the
    audio output is not floating as I will have to ground one leg of the
    divider. I guess I could measure the resistance to ground on both sides of
    the speaker out to see if one side is grounded? Sure wish I new the correct
    procedure to access the speakers there is lots of screws all round the TV.
    This is first time I have had to work on a plasma TV.


    He all ready has an nice amplifier and speakers and doesn't really care for
    Dolby Digital or surround sound and stereo would be fine.

    He wants to operate his system via the TV (one) remote. If he purchases a
    home entertain system he will have one for TV and one for volume and one for
    DVD player.

    I also know that you could purchase a universal remote, but it can be very
    costly ($300) and is headache to program.

    Any comments
  2. Ian Bell

    Ian Bell Guest

    Personally I would place the attenuator on the primary side so as to
    mimimise the distortion in the bridging transformer.

  3. Clint Sharp

    Clint Sharp Guest

    Personally, I'd take the damn thing back to the store and tell them it's
    not fit for the purpose.
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