LG 42PG20 no video

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  • microvibe
    Badcaps Veteran
    • Mar 2013
    • 275
    • canada

    #1

    LG 42PG20 no video

    Have lg 42pg20. When I got it the tv it would just click then turn off. Disconnected zsus and it would turn on and stay on. Replaced 4 blown fets on zsus now when I turn on it stays on but no panel glow or any thing.

    I have all correct voltages from psu to ysus but from ysus to zsus I have 188v for vs and 3v for zsus no changes when buffer disconnected. Can't find any shorts on ysus ethier. Not sure what to check on ysus or do I just get new ysus?
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  • freakaftr8
    Badcaps Legend
    • Oct 2012
    • 3743
    • USA

    #2
    Re: LG 42PG20 no video

    Are those IPM modules under the heat syncs?
    Did I leave the soldering iron on?

    Comment

    • microvibe
      Badcaps Veteran
      • Mar 2013
      • 275
      • canada

      #3
      Re: LG 42PG20 no video

      No just gets attached this model doesn't have those ipm

      Comment

      • freakaftr8
        Badcaps Legend
        • Oct 2012
        • 3743
        • USA

        #4
        Re: LG 42PG20 no video

        Do you have VSCAN on Ysus? And are there two buffer boards or just One?
        Did I leave the soldering iron on?

        Comment

        • microvibe
          Badcaps Veteran
          • Mar 2013
          • 275
          • canada

          #5
          Re: LG 42PG20 no video

          There is just one buffer board. There is no vscan voltage it's like 3 volt with or without buffer connected.

          Comment

          • freakaftr8
            Badcaps Legend
            • Oct 2012
            • 3743
            • USA

            #6
            Re: LG 42PG20 no video

            So what you're saying is you are getting VS voltage to YSUS not ZSUS? What is VS voltage per panel label?
            Last edited by freakaftr8; 01-12-2018, 06:00 PM.
            Did I leave the soldering iron on?

            Comment

            • microvibe
              Badcaps Veteran
              • Mar 2013
              • 275
              • canada

              #7
              Re: LG 42PG20 no video

              Vs going to ysus and vs leaving ysus to zsus at 188v as per panel spec. Va is 59v as per panel spec.

              Comment

              • freakaftr8
                Badcaps Legend
                • Oct 2012
                • 3743
                • USA

                #8
                Re: LG 42PG20 no video

                Ok. What are you measuring that only has 3v?
                Did I leave the soldering iron on?

                Comment

                • microvibe
                  Badcaps Veteran
                  • Mar 2013
                  • 275
                  • canada

                  #9
                  Re: LG 42PG20 no video

                  The vsc vsy points with and without buffer connected.

                  Comment

                  • microvibe
                    Badcaps Veteran
                    • Mar 2013
                    • 275
                    • canada

                    #10
                    Re: LG 42PG20 no video

                    Did more testing replaced more shorted fets on zsus.

                    From connector ysus to zsus I have 188v on vs the 3 zsus labeled pins have 31v. When I put test pattern jumper on control board the zsus pins jump from 31v to 60v still no image on screen. The connection from zsus to control board I get 4.8v on 15v pins and nothing on the sus on or sus dn pins. I tested vsc and vsy on ysus with and without buffer jumps to 28v when control board in test pattern mode.

                    Any ideas where check

                    Comment

                    • microvibe
                      Badcaps Veteran
                      • Mar 2013
                      • 275
                      • canada

                      #11
                      Re: LG 42PG20 no video

                      Was thinking I have bad ysus but cant find any shorts .

                      Comment

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