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LCD 40 Inch Samsung HD 100Hz Has horizontal black lines every second line up to 120 mm from bottom of screen. This occurs at all times and with all sources incl.terrestial tv.It is approx 18Mths old

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  • kmh8455 Apr 18, 2009

    LA40F81BD

  • kmh8455 Apr 18, 2009

    I have moved the set and disconnected all exernal sources.Connected to a new single power supply and connected my digital camera to ( av1) it still shows the lines.The lines are also present on the "blue screen" prior to selecting a source

  • kmh8455 Apr 18, 2009

    I cannot check the line voltage but I have connected a DVD player with an HDMI output and am still getting the lines

  • kmh8455 Apr 18, 2009

    No I do not have any voltage stabalizing equipment or similiar with a voltage meter.

    the lines as I said previously are runing horizontally across the bottom of the screen and are stationary

  • kmh8455 Apr 18, 2009

    as stated earlier the "lines" are stationary, horizontal and from the bottom of the screen to 120 mm up, they are every second line of the display (in my opinion) and give it a shaded look in that area

  • kmh8455 Apr 18, 2009

    This is not a picture tube it is an LCD ! please someone whom has experience in LCD repair reply to this issue

  • kmh8455 Apr 18, 2009

    Thank you for your intelligent reply

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  • 265 Answers

Hi there,

I had the same problem as you,
Unfortuntly the LCD had to be repaired under house insurance.
The problem was a few dead pixels in the same circuit (i.e 3 pixals on the same line will mean the whole line will go dead) This is just like a electrical circuit, and there is no way to replace the pixals with out a new LCD.

I know this has not solved the problem but it wil get you on the right track.

I recommend if you have house insurance to claim it of that, or if its under warrently.

Hope this helps

Alex

Posted on Apr 18, 2009

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  • 66 Answers

Dear friend this problem mainly occurs with the picture tube .
due to irregular voltage or fluctuation or high voltage the filament may have got burnt out and the capacitor is not working properly so u need may need to show up the picture tube to mechanic and he will surely tell u to get this out...
thank u.

Posted on Apr 18, 2009

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Could u pls tell me the model number of ur lcd exactly

Posted on Apr 18, 2009

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  • Shoaib Rais
    Shoaib Rais Apr 18, 2009

    if u take out all conn cables from it and use it with dvd player u see those lines as well

    what is the way u are connecting it thru hdmi

    and do u see these lines running in almost every mode dvd, tv, ......cable box


  • Shoaib Rais
    Shoaib Rais Apr 18, 2009

    also tell me the power source where it is connected , is any other electrical appliance also taking power from it or not ? and do u have any computer or microwave oven or something like that running near it or on the same electric board

  • Shoaib Rais
    Shoaib Rais Apr 18, 2009

    kindly answer me i am about to solve ur problem

  • Shoaib Rais
    Shoaib Rais Apr 18, 2009

    Actually the power coming from board is not accurate it has dropped voltage and this is giving trouble to LCD tv bcoz it is sensitive equipment , if u are using separate power board pls if u have power meter with u kindly check the voltage supply from the electric board and tell me the current rating , where are u right no0w i mean which country check current rating accordingly if US shud get 120 volts and if somewhere else it needs to be 210-240 V please check and confirm

    One last thing do u have dvd player with hdmi out and hdmi cable with u ? if this power thing is ur problem right now u can try hdmi cable and dvd player it will not showup these lines during dvd playback i am sure

    pls replay as soon as possible i am up to solve ur problem right away

  • Shoaib Rais
    Shoaib Rais Apr 18, 2009

    ARE THESE LINES RUNNING on screen or still in one position stable ??

  • Shoaib Rais
    Shoaib Rais Apr 18, 2009

    do u have voltage stabilizer or any other device that is fitted with voltage meter that can show the line current

    pls tell me are these lines running from top to bottom or opposite


  • Shoaib Rais
    Shoaib Rais Apr 18, 2009

    it is 100% power issue if these lines are running from top to bottom or vice versa u have to get a power meter and check the voltage comingfrom ur Electric Socket board in order to fully trouble shoot , these line issues are related to power problems , so pls do the needful in order to fully resolve the issue if power comes ok then only i can go forward ! pls rate me for my response if u like

  • Shoaib Rais
    Shoaib Rais Apr 18, 2009

    ok i have found some info for u direct from SAMSUNG

    The
    line you see rolling through your picture (usually starting at the bottom and
    rolling up to the top and then repeating), can have one or more causes.


    To
    determine the cause of the rolling line, follow these steps:



    1. Check
      for the rolling line on all the sources you use (cable, component, HDMI,
      etc.).
    2. If
      the rolling line appears on all sources, your TV may not be grounded properly.
      The grounding problem can be caused by the TV or the outlet you’ve plugged
      the TV into. Check the grounding of the outlet. If the outlet appears properly
      grounded, then your TV is not grounded properly and needs service. Please
      click the Create Online Service Request button below. If the rolling line
      does not appear on all sources, continue to Step 2.

      Important:
      Using a three prong to two prong adapter on the television’s plug removes
      the grounding on the TV and can cause rolling lines.



    1. If
      the rolling line only appears on one source, it may be caused by electromagnetic
      interference, low signal strength, or faulty wiring. To identify the cause
      of the rolling line, read the appropriate troubleshooting recommendations
      below.
    pls tell em the results it is power issue


  • Shoaib Rais
    Shoaib Rais Apr 18, 2009

    have u checked this grounding thing i got from Samsung

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