Question about Projection Televisions

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My new Samsung flat panel lcd tv often has a horizontal line continually moving vertically and also a groaning noise; this occurs especially when a set of lights (close to tv) with energy-saving bulbs and a dimmer switch is turned on! Can you suggest as to how to get rid of these problems. Thank you. - M K Paul

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  • mrinalpaul Sep 03, 2008

    The answer needs further clarification for a lay man e.g. what is a power filtered strip, where do you find it and how much should it cost? Do the problems indicate that Samsung has not taken all necessary measures to make my tv fully noise proof? Definite answers to all these questions will be of great help to me. Thank you.

    - M K Paul


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Due to the heavy load on your single phase unit it creates this problem when other devices are powered ON on the same track. to get rid of this u need to have atleast the double phased power supply to take the load of all the devices.nothing to worry everything is normal.

pls do rate the solution

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Posted on Sep 03, 2008

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At best described, your unit is getting RFI (radio frequency interference) or basic electrical noise. Such could be brought about by other electronic devices physically near the Samsung flat panel LCD TV which may include (but not be limited to wireless phones, electronic ballast of florescent lamps, VCR/DVD/Gaming consoles with Channel 3/4 outputs.

Possible corrective actions:

  • the simplest, move such devices away;
  • try using a power filtered strip;
  • try plugging other devices in another wall outlet.
The technically correct procedure would be to improve the shielding of all these devices including the Samsung but that would be beyond normal user actions. Additionally, it should have been addressed in the manufacturer's design in the first place.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Sep 03, 2008

  • Louie  Role
    Louie Role Sep 04, 2008

    Hi again,

    Appreciate your postback.

    • what is a power filtered strip, where do you find it and how much should it cost?
    a filtered power strip is a multiple outlet that has an electrical filtering. It is designed to reduce if not eliminate any electrical noise entering an electronic device through the AC plug/cord. Here is an" target="_blank" rel="nofollow" >example and they are often used with computers. Your choice of course should match your regions electrical system/requirements.

    • Do the problems indicate that Samsung has not taken all necessary measures to make my tv fully noise proof?
    most manufacturers would design their system to counter such electrical noises. It is unfortunate however that not all noises could be prevented. This is because (as in your Samsung), it has multiple entrance points which the unit could not do without, the AC cord, the CABLE/RF IN and the Audio/Video IN. Electrical noise could be prevented with adequate shielding but at most is a compromise. Some noise piggy ride on the AC power, the incoming TV signal and on the Audio/Video signal.

    In your particular concern, the noise is electrical produced by the switching electronics of the dimmer. Technically, it could possibly be a triac switching on & off the supply to the energy-saving bulbs at such a high rate, the effect of which is to reduce light level. Another possibility is that the energy-saving bulbs are using an electronic ballast that produces high frequency high voltage.

    Having said as much, the only options then would be:

    • relocate the dimmer (if wall mounted, of course impractical);

    • relocate the TV;

    • try powered filter strip;

    • replace the dimmer with an ordinary on/off switch;

    • replace the energy-saving bulbs with some other model/version that do not use an electronic ballast.


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