42" LG Plasma won't turn on

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  • dskall
    Badcaps Legend
    • Oct 2016
    • 2905
    • usa
    #21
    Re: 42" LG Plasma won't turn on

    You don't have pic of power board. You should have a va and a vs test point on power board voltages should match the sticker voltages on the panel looks like upper left corner of panel. Sorry I can't get your pictures to load so can't see close up.
    I assume no responsibility for any stupid suggestions I might post.

      Comment

      • dskall
        Badcaps Legend
        • Oct 2016
        • 2905
        • usa
        #22
        Re: 42" LG Plasma won't turn on

        If you don't hear a click then you should not have these voltages as I believe they are the last to power on ysus and zsus or whatever lg calls those boards. If you have those voltages then I think tv has powered on. I would check y and z boards for an open. If you don't have those voltages. I would look at mainboard or button problem not giving command to the pson pin on power board.
        I assume no responsibility for any stupid suggestions I might post.

          Comment

          • neutron561
            Member
            • Jan 2017
            • 21
            • USA
            #23
            Re: 42" LG Plasma won't turn on

            Originally posted by dskall
            If you don't hear a click then you should not have these voltages as I believe they are the last to power on ysus and zsus or whatever lg calls those boards. If you have those voltages then I think tv has powered on. I would check y and z boards for an open. If you don't have those voltages. I would look at mainboard or button problem not giving command to the pson pin on power board.
            I do have 55 vdc on the VATP and 205 vdc on the VSTP. I don't see a relay on any board.
            Attached Files

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              • dskall
                Badcaps Legend
                • Oct 2016
                • 2905
                • usa
                #24
                Re: 42" LG Plasma won't turn on

                Those voltages power the sus boards and usually won't come on if there is a problem. They need to match the voltages on the sticker upper left corner of panel. If your sus boards were shorted you won't have those voltages. Does green light flash once a second? I haven't seen the inside of an LG but most have fuses on sus boards.
                I assume no responsibility for any stupid suggestions I might post.

                  Comment

                  • dskall
                    Badcaps Legend
                    • Oct 2016
                    • 2905
                    • usa
                    #25
                    Re: 42" LG Plasma won't turn on

                    OK, what you can try and do is jumper the two holes marked EXT AUTO GEN on this board:
                    https://www.badcaps.net/forum/attachm...1&d=1421777971

                    And disconnect LVDS (right most ribbon connector)

                    Then plug TV into mains power.

                    Do you get a sequence of test patterns appearing on the screen?
                    I copied this from tom66 you might try and see if you get something on the screen.
                    I assume no responsibility for any stupid suggestions I might post.

                      Comment

                      • neutron561
                        Member
                        • Jan 2017
                        • 21
                        • USA
                        #26
                        Re: 42" LG Plasma won't turn on

                        Thanks for the help guys. Set going to e-waste recycling tomorrow.

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