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Crackling on TVs

Discussion in 'Electronic Repair' started by [email protected], Jan 5, 2006.

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  1. Guest

    Any explanation for why there is sometimes a crackling noise when you
    first turn a television on?
  2. sofie

    sofie Guest

    high voltage start up (crackling) and automatic degaussing circuitry
    (whoosh) operating.

    - - - - - - - - - - -
  3. That's from the bag of potato chips your opening.

    uhhg....couldn't resist!

    Jeff Stielau
    Shoreline Electronics Repair
    344 East Main Street
    Clinton,CT 06413
    860-664-3535 (fax)

  4. Frank

    Frank Guest

    1. If you hear a 'boom' at the power up state, it's probably a VDR (Voltage
    Dependent Resistor) normalize the magnetic field in the CRT. (The cable that
    goes around the tube).

    2. The cracling noises are static discharges. Absolutely normal at power up.
    If you then turn it off and back on, there will be less cracling noise.

    Hope this opens up a new world for you :)

  5. Dave D

    Dave D Guest

    It's the degaussing coils causing a vibration at line frequency. The
    thermistor in the degaussing circuit (not VDR) makes no noise.

  6. PaPaPeng

    PaPaPeng Guest

    Quite likely the dust build-up inside the TV set had come to a point
    where the high voltage parts can arc across the fingers of dust. An
    easy fix will be to use compressed air to blow the insides clean or
    else vacuum it. Usual precautions - unplug, remove the cover and do
    it outdoors. You don't want the dust inside the house anyway.
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