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OLED55B7A-U black screen but powers on

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    #1

    OLED55B7A-U black screen but powers on

    I have a fairly new but our of warranty LG OLED55B7A-U TV that all of the sudden developed a black screen. Sound still works, once in a great while can get a faint ghosting to appear in background if you look real close. Using a flashlight close to the screen does not indicate a faint image is present.

    Any thoughts on where to start and likely cause of problem?

    Have toggled on and off, checked inputs, checked inputs with different signals, looked at all boards and connections for any signs of heat or smell. Found nothing so far.

    Any help is appreciated.
    Tags: None
    #2
    Re: OLED55B7A-U black screen but powers on

    Could use some good pictures of boards.
    I assume no responsibility for any stupid suggestions I might post.

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      #3
      Re: OLED55B7A-U black screen but powers on

      I tried to show front and back where possible. I have reseated all connections. One thing top note, the red standby light does flash three times when the TV is powered on. As mentioned previously, occasionally there is a slight ghosting for a second once in a while, certainly not every time.











      Attached Files

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        #4
        Re: OLED55B7A-U black screen but powers on

        https://www.youtube.com/watch?v=Ksa3...ndRepairTVs%2C
        I assume no responsibility for any stupid suggestions I might post.

        Comment

          #5
          Re: OLED55B7A-U black screen but powers on

          would check all the solder joints in picture 2, hard to tell from picture but some of them don't look that great, examples of bad joints: https://www.google.com/search?q=bad+...ih=607&dpr=1.5

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            #6
            Re: OLED55B7A-U black screen but powers on

            you said you have sound but the screen remain black... i would try first to send IN_STOP command to make hard reset for LG. also you can before sending In_STOP check if the Connector from power boards to the middle T-CON driver boards if you have 12V & 24V.. 24V are responsible for OLED

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              #7
              Re: OLED55B7A-U black screen but powers on

              How do you perform the in stop function?

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                #8
                Re: OLED55B7A-U black screen but powers on

                Check the voltage after these fuses (there is voltage on these capacitors).
                Attached Files

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                  #9
                  Re: OLED55B7A-U black screen but powers on

                  Eh....LEDs usually

                  Comment

                    #10
                    Re: OLED55B7A-U black screen but powers on

                    Originally posted by sintv View Post
                    Eh....LEDs usually
                    What LEDs, this is an OLED tv, it has no backlight.

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                      #11
                      Re: OLED55B7A-U black screen but powers on

                      Originally posted by lotas View Post
                      Check the voltage after these fuses (there is voltage on these capacitors).
                      we had before threat over here. it was same boards which the 24V socket burned out at the power boards side.

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                        #12
                        Re: OLED55B7A-U black screen but powers on

                        Originally posted by Diah View Post
                        we had before threat over here. it was same boards which the 24V socket burned out at the power boards side.
                        Yes I remember.

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