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How to rwgulate the white "noise"

Discussion in 'Repairing Electronics' started by Kryten, Dec 8, 2008.

  1. Kryten

    Kryten New Member

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    Hi Not sure this is in the correct category but anyways...

    i got a 37' LCD from LG. My problem is that when i look at TV i gett nois when the screen is withe. Im using a scart from my satelite decoder, is there any way to regulate the withe level?

    The noise only occurse when im using my sat decoder NOT when i look at DVD (also via scart).

    The nois is a sound that (i would think ) is about 100 - 500 Hz and it dosen't matter if i mute the TV or not its always there (when all white or brigth colors)

    can anyone advice me on what to do?
     
  2. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    Presumably it's mechanical noise from the inverter or PSU - as it's at a low frequency it may be the PSU is 'hunting' and putting ripple on the output.

    Unless it's particularly loud, it may be 'normal' and within design limits.
     
  3. Kryten

    Kryten New Member

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    Well Nigel its quite loud. enough too "shout" over TV audio when i look at the TV and have a low volume on. And since its only when i use my Sat decoder i was thinking it might bee that the decoder puts out a withe signal thats too high.
     
  4. dave

    Dave New Member

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  5. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    Common problems are capacitors going high ESR, you may have some that have done just that - worth looking inside see if you can see any with bulging tops.
     
  6. Kryten

    Kryten New Member

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    Ok but is it the TV or is it the decoder? got any good guess?
     
  7. blueroomelectronics

    blueroomelectronics Well-Known Member

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    If your DVD is fine then it's probably the decoder.
     
  8. Kryten

    Kryten New Member

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    Hmm must chekc to see if i cant tune it in to correct signal levels
     

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