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Stuck on HDMI input, OSD always on screen, Front Panel and Remote Control not working

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    #1

    Stuck on HDMI input, OSD always on screen, Front Panel and Remote Control not working

    Hello eveyone. Need help from this community of experts. My problem:

    LED TV LG 42LS4600
    - Front panel buttons not working.
    - Remote control not working.
    - The only way to turn on/off the TV is to plug/unplug it.
    - Stuck on HDMI input.
    - HDMI OSD constantly shows the HDMI input on top of the screen.

    Video and audio = no problem.

    Bought a replacement Mainboard, exact same model, and now everything looks upside down (video and osd), and volume OSD goes to 100% and stays stuck on screen. if I disconnect the front panel cable, the volume OSD disappears.

    If I install the original Mainboard, then original symptoms return.

    Is this a T-con problem? Power supply board? EEPROM corrupted maybe, but why two times?? I'm not sure which replacemet I need to buy to get it working. I´m not a technician. Please help
    Tags: None
    #2
    Re: Stuck on HDMI input, OSD always on screen, Front Panel and Remote Control not wor

    "if I disconnect the front panel cable, the volume OSD disappears. If I install the original Mainboard, then original symptoms return." Do you mean with original main board installed and the front panel cable disconnected HDMI OSD constantly shows the HDMI input on top of the screen? it sounds to me like you have stuck button.
    We need to see the pictures of the whole backside of the board and all the board, especially the IR receiver board and the user button board.
    Last edited by budm; 09-29-2015, 09:07 AM.
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment

      #3
      Re: Stuck on HDMI input, OSD always on screen, Front Panel and Remote Control not wor

      is the power supply outputting all the correct voltages to the mainboard?

      Comment

        #4
        Re: Stuck on HDMI input, OSD always on screen, Front Panel and Remote Control not wor

        Originally posted by budm View Post
        Do you mean with original main board installed and the front panel cable disconnected HDMI OSD constantly shows the HDMI input on top of the screen?
        Yes.

        Mainboard #1 : Image right, not upside down. Remote control and front panel not working. OSD constantly shows the HDMI input on top of the screen. If I unplug tv, disconnect front panel cable, plug again tv, everything remains the same.

        Mainboard #2: Image and OSD upside down. Remote control and front panel not working. OSD shows AV mode, then the Volume indicator goes up to 100%, then it doesn't go away. If I unplug tv, disconnect the front panel cable, plug tv, the volume OSD disappears, but image still upside down. Remote control and front panel still not working.

        I must say that all began when I made a mistake connecting a micro-usb to hdmi phone-TV adapter. The usb cable that goes to external power, I plugged in to my TV usb port, that was my mistake . TV immediately went black, and blinked rapidly for a few seconds. I got scared and unplugged the tv from the wall.

        Will changing the T-Con Board, Front Panel or Power Board fix the problem? I will try to upload pics. Thanks.
        Last edited by Karellen; 09-29-2015, 11:39 AM.

        Comment

          #5
          Re: Stuck on HDMI input, OSD always on screen, Front Panel and Remote Control not wor

          Originally posted by vinceroger69 View Post
          is the power supply outputting all the correct voltages to the mainboard?
          Unfortunately, I don't know how to do that

          Comment

            #6
            Re: Stuck on HDMI input, OSD always on screen, Front Panel and Remote Control not wor

            "Mainboard #1 : Image right, not upside down. Remote control and front panel not working. OSD constantly shows the HDMI input on top of the screen. If I unplug tv, disconnect front panel cable, turn on again tv, then OSD constantly shows the HDMI input, no change." But if you hook the Video source to the HDMI, do you get normal pictures?

            "Mainboard #2: Image and OSD upside down." This sounds like the main board is not compatible with your TV model. Where did you get the second board from?

            The symptom has nothing to do with the T-CON board.
            Never stop learning
            Basic LCD TV and Monitor troubleshooting guides.
            http://www.badcaps.net/forum/showthr...956#post305956

            Voltage Regulator (LDO) testing:
            http://www.badcaps.net/forum/showthr...999#post300999

            Inverter testing using old CFL:
            http://www.badcaps.net/forum/showthr...er+testing+cfl

            Tear down pictures : Hit the ">" Show Albums and stories" on the left side
            http://s807.photobucket.com/user/budm/library/

            TV Factory reset codes listing:
            http://www.badcaps.net/forum/showthread.php?t=24809

            Comment

              #7
              Re: Stuck on HDMI input, OSD always on screen, Front Panel and Remote Control not wor

              possable two faulty mainboards was your replacement board a exact mach all numbers on stickers etc match ok?

              Comment

                #8
                Re: Stuck on HDMI input, OSD always on screen, Front Panel and Remote Control not wor

                Originally posted by vinceroger69 View Post
                possable two faulty mainboards was your replacement board a exact mach all numbers on stickers etc match ok?
                Yes. The replacement board is from a cracked panel tv, same model, same stickers, exact match.

                Comment

                  #9
                  Re: Stuck on HDMI input, OSD always on screen, Front Panel and Remote Control not wor

                  Originally posted by Karellen View Post
                  Yes. The replacement board is from a cracked panel tv, same model, same stickers, exact match.
                  I´ve checked again. Replacement Mainboard: same model, but different revision. I guess that explains the upside down image.

                  I'm trying to take pictures of the IR sensor / Touchpad board (510). I have removed screws (from 310), speakers (120), but I don't know how to remove #310 part, I don't want to break anything.

                  Any help would be greatly appreciated.







                  Last edited by Karellen; 10-01-2015, 10:25 AM.

                  Comment

                    #10
                    Re: Stuck on HDMI input, OSD always on screen, Front Panel and Remote Control not wor

                    Touchpad problem solved. It was a bent pin


                    Original Mainboard: Nothing changed. Front panel still not working. Stuck on HDMI. OSD always on screen.

                    Replacement Mainboard: Everything ok, only issue is image upside down.

                    Comment

                      #11
                      Re: Stuck on HDMI input, OSD always on screen, Front Panel and Remote Control not wor

                      some times in the service menu you can change that maybe one of the more experiened members can advise

                      Comment

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