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

    Well-Known Member

    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

    Distinguished Member

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