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Sharp tv help

Discussion in 'Electronic Repair' started by Ken G., Sep 9, 2006.

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  1. Ken G.

    Ken G. Guest

    2 or 3 year old 32inch sharp flat screen crt set . it turns on , screen
    is dark . When i turn it off i see a white flash at the top of the
    screen It repeats this each time i turn it on & back off . Turning the
    screen up on the flyback does not bring up a screen .
     
  2. Guest

    Ken:
    I sounds like you may have a problem in the vertical sweep circuit
    causing the picture to be drawn as one line way up at the top
    of the picture tube. The protection circuit may be active and killing
    the power or video.
    Try connecting one of the video cathodes (red, green or blue) at
    the back of the picture tube socket to ground THROUGH a 1K
    resistor. This should cause the screen to turn on with the selected
    color.
    Also check the G1 pin (pin 1) at the socket. If it is way negative
    (over -100 volts), it may be cutting off the picture.
    Also check the voltage on the G2 screen pin.
    Note, this checks may not work if the set is loosing power
    when it is turned on.

    Hope this helps...
    John
     
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