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    #1

    No video-LG 42LG30

    LG 42LG30-UD After replacing Main board because of burnt regulator, I have back lights lit up and audio but no video/menu's/OSD. Remote and buttons on front will work. I've double checked to make sure the replacement main was same numbers as original. Any ideas?
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    #2
    Re: No video-LG 42LG30

    bad Tcon?

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      #3
      Re: No video-LG 42LG30

      Check all p/s caps. That model is notoriously bad here for that. Where did the burnt reg feed power to? Is TCON now dead? Check fuses on it.

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        #4
        Re: No video-LG 42LG30

        Originally posted by saddle_au View Post
        Check all p/s caps. That model is notoriously bad here for that. Where did the burnt reg feed power to? Is TCON now dead? Check fuses on it.
        Psu caps on the 42LG30 normally never ever fail they use a good series on these thats older models not the 3000 series. But I agree if Mb failed in that way Tcon is likely dead.
        Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

        https://www.facebook.com/Telford-Tel...7894576335359/

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          #5
          Re: No video-LG 42LG30

          I have ordered a TCON board and will post after it arrives.

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            #6
            Re: No video-LG 42LG30

            I replaced the TCON board but still have same problem. The IC that was burnt up on Main board is Q706. I will change the caps on the PS board and see.

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              #7
              Re: No video-LG 42LG30

              Did you seat the LVDS cable from Main Bd to T-CON Bd properly? What about the ribbon cables from T-CON Bd to Panel? If all is good then you probably got a bad Main Bd and/or T-CON Bd bad.

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                #8
                Re: No video-LG 42LG30

                Rather check the LVDS with an oscilloscope first.

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                  #9
                  Re: No video-LG 42LG30

                  The problem was the Main board. The first one I order, although it had the right part number on the PC board, had a sticker that showed it was out of a 32inch set. The next one I ordered had a sticker that showed it was from/for a 42inch. After replacing with the 42inch board, video was perfect.

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                    #10
                    Re: No video-LG 42LG30

                    I have this model (UA) and am experiencing quick white flashing when power on then blank with sound only. Something to do with back light or inverters because any cable disconnected from PS or to cfls and no flash.

                    Any known caps that cause this issue?
                    Last edited by rustytierod; 09-12-2017, 08:33 PM.

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