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Troubleshooting Samsung LCD monitor

Discussion in 'General Electronics Chat' started by TechnoRépare, Apr 28, 2012.

  1. TechnoRépare

    Thread Starter New Member

    Apr 25, 2012
    When I connect my samsung LCD ,the image appears at first and a few seconds later the luminosity drop and the image become so dark we hardly can see it, but the image is still there. So I first tought that the power supply is broken. Also the transfo on the power supply board emits a sound as if there was a shorcut in it;as if it was making electric arc inside.

    As the transformer seemed the most suspicious and since I couldn't find the same transfo anywhere I ordered a new power supply.
    Now, when I try it again, it does the very same thing.The transfo emits that same sound , the monitor turns on for a few minutes and then the luminosity drops and we can't see anything.

    So I remembered that the power supply I bought on ebay was used , but supposedly fully fonctionnal.

    My question is: Is it that the power supply I bought have the same problem as the last one, or could it be a problem somewhere else in the monitor?
    Because if it is a problem somewhere else I really can't see why would the transfo make that sound. What is other typical problem that a backlight can have if we supposed it is correctly powered?


    I will return the boeard to you, can you pay the shipping and send me another one?

    Thank you for your fast answer
  2. debe

    AAC Fanatic!

    Sep 21, 2010
    Its highly unlikely your new board is faulty. There is probably a fault further on creating an overload situation for the powersupply board.
  3. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    Return the board ?

    to who?
  4. TechnoRépare

    Thread Starter New Member

    Apr 25, 2012
    I made a copy-past of a part of the message I sent to the dealer from who I bought the board...
    Forget the '' I wil return the board to you''
  5. paulktreg

    AAC Fanatic!

    Jun 2, 2008
    It sounds like a problem with the invertor that drives the backlight.