Question about Sanyo DP32746 32 in. LCD Television

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Sanyo DP32746 no picture, sound good

Screen went black, only one or two small flashes on power up. Approx. 1.5 years old. CCFL's or Backlight Inverter?

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If sound is ok, check appropriate video connection to make sure it corresponds to the audio connection being used. If connected with the component jacks on a DVD player, it may be necessary to access the DVD menu to select the component outputs or S-Video output.
Backlights in LCD screens are referred to as cold cathode fluorescent lamps (CCFLs). They are long, thin sealed glass tubes with an electrode at each end filled with gas and a small amount of mercury. The inner wall of the tube is covered with phosphor layers. The lamp is powered when high voltage is applied between the two electrodes, which causes the invert gas to ionize and display ultraviolet light.
The voltage is supplied from the inverter.

Posted on Mar 17, 2008

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos Mar 17, 2008

    I would try to measure output inverter voltage.(enough experience and special tools neened).
    It is better to take it to qualified repair shop.
    Good luck.

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If there is still sound its the back light inverter, if no power at all its the ccfl

Posted on Mar 17, 2008

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Hello, I just posted this to another user's question, and you might find it useful, too.

I have a pile of these in my shop. Unfortunately and usually, a backlight lamp is bad, and the inverter board is damaged when it goes out. The backlight lamps are sealed inside the panel, so the usual method of repair is to replace the panel.
If you turn the lights off in the room, then turn the tv on, you will probably see a momentary flash of light from the backlight trying to start up. The lamps can be replaced, but the option is not really cost effective given the amount of time it takes to replace them/very delicate nature of the lamps/availability of the lamps/cost of the lamps. Replacement panels might be available, but you'd have to use a TV shop for reference or call Sanyo directly.
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