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Samsung LCD LE40R86 no picture

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    #1

    Samsung LCD LE40R86 no picture

    Today I got two Samsung LCD tv's model LE40R86 with the standard cap problem. The first was a successful repair, but the second refuse to start up the screen. I even swapped powersupplies but that makes no difference.
    Both powersupplies works in the "OK" tv.
    It seems like when the TV tries to start up the inverter and lamp, the set goes into protect. What could be wrong, the lamp perhaps?
    Haven't done much in this area, so any advice is welcome!
    Last edited by PowerAmpFreak; 08-17-2010, 02:39 PM. Reason: grammatic refinement
    Tags: None
    #2
    Re: Samsung LCD LE40R86 no picture

    Originally posted by PowerAmpFreak View Post
    Today I got two Samsung LCD tv's model LE40R86 with the standard cap problem. The first was a successful repair, but the second refuse to start up the screen. I even swapped powersupplies but that makes no difference.
    Both powersupplies works in the "OK" tv.
    It seems like when the TV tries to start up the inverter and lamp, the set goes into protect. What could be wrong, the lamp perhaps?
    Haven't done much in this area, so any advice is welcome!
    Well, you've established it isn't the power supply. Without pictures, the other possible candidates are the main board and POSSIBLY the inverter. Usually the inverter does not return a status signal to the main board, but it might possibly be overloading the power supply.

    PlainBill
    For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

    Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

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      #3
      Re: Samsung LCD LE40R86 no picture

      There are a connector to the Inverter board, +12V and one of the other poles were marked "FB", could this be feedback perhaps?
      Maybe this is used as a status signal if the inverter operates?

      Comment

        #4
        Re: Samsung LCD LE40R86 no picture

        What a joke! Both Samsung's had capacitor problems in powersupplies.
        The first TV will not give any picture. Shuts itself off when inverter should start.
        The other TV both pic and sound works (halleluja).
        I swapped powersupplies - no help for the tv without picture
        I then swapped main boards, then the picture was there.
        I swapped back mainboards, back to the begining again.
        TV was put for final test, suddenly after one hour the TV shuts off.
        It now act exactly as the other, which refuse to give any picture.
        Exactly when the inverter is to start, it shuts off, tries again, shuts off, repeats
        Obviously BOTH main boards are bad,
        Even worse, they are no longer available to order. What a joke!

        Comment

          #5
          Re: Samsung LCD LE40R86 no picture

          What is the main/b's part number?

          P.S.
          It's good to have two identical item for checking error etc, saves lots of time.

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            #6
            Re: Samsung LCD LE40R86 no picture

            Mainboards are: BN41-00813B MP1.0 Bordeaux plus

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              #7
              Re: Samsung LCD LE40R86 no picture

              See attached picture. Chip in the middle of the picture gets hot when set is trying to startup. Another SSB replacement necessary perhaps?
              Attached Files

              Comment

                #8
                Re: Samsung LCD LE40R86 no picture

                Hi, I have problem in my LE40R86, the DVB-T is not available, can some one help me please? I tried the service menu reset, but it did not work....

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