LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

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  • Michale32086
    New Member
    • Nov 2011
    • 1453
    • USA
    #1

    LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

    I have a 60" LG Plasma, 60PB6650....

    Upon power up, a Power PCB relay clicks, the screen flashes and then nothing. After a few seconds, the process repeats...

    I get good voltages (VS 207v, VA 55v) at power up/relay click... Then voltages start to drop and then back up on the subsequent power up/relay click..

    Thinking X/Z Sus, I replaced that board...

    Still no go.. Still nothing but screen flash and relay click...

    X-Sus, Control Board or Main??
    Attached Files
    Tags: None
    • Hamie
      Badcaps Legend
      • Apr 2014
      • 1383
      • UK
      #2
      Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

      Test patterns?

        Comment

        • Michale32086
          New Member
          • Nov 2011
          • 1453
          • USA
          #3
          Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

          Originally posted by Hamie
          Test patterns?
          Yes, please.

          Sorry, couldn't resist..

          How would I call the Test Patterns??

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

              Here, test pattern... here boy...




              ...


              Jumper EXT AUTO GEN on control board, (two holes)
              Disconnect LVDS from control board side.
              Apply 120 volts to plug.
              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                Comment

                • Michale32086
                  New Member
                  • Nov 2011
                  • 1453
                  • USA
                  #5
                  Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

                  Originally posted by tom66
                  Here, test pattern... here boy...
                  Ahhh I see.. You got jokes..




                  ...

                  Originally posted by tom66
                  Jumper EXT AUTO GEN on control board, (two holes)
                  Disconnect LVDS from control board side.
                  Apply 120 volts to plug.

                  Ahhhh That's right.. It's been a while..

                    Comment

                    • Michale32086
                      New Member
                      • Nov 2011
                      • 1453
                      • USA
                      #6
                      Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

                      Yep, I get the test patterns. Gray, Red, Green etc etc...

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK
                          #7
                          Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

                          Main board dead then. Or LVDS cable, but that's very rare. Replace the main. 50" 1080p one should be okay. 42" one is not.
                          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                            Comment

                            • Michale32086
                              New Member
                              • Nov 2011
                              • 1453
                              • USA
                              #8
                              Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

                              Originally posted by tom66
                              Main board dead then. Or LVDS cable, but that's very rare. Replace the main. 50" 1080p one should be okay. 42" one is not.
                              Awesome sauce..

                              Thanx for the assist, guys...

                                Comment

                                • Michale32086
                                  New Member
                                  • Nov 2011
                                  • 1453
                                  • USA
                                  #9
                                  Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

                                  Main Board replaced..

                                  TV works like a charm...

                                  Thanx again...

                                    Comment

                                    • EchoEleven
                                      New Member
                                      • Oct 2018
                                      • 2
                                      • United States
                                      #10
                                      Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

                                      Sorry to bring up an old post, but I just had the exact same thing. I followed this thread and decided I needed a new main board. I ordered a new main board from a supplier and installed it, now the TV does come on, but sometimes get stuck on the boot screen, and sometimes after about 2-3 minutes will go to the HDMI input. Sometimes buttons on the remote respond in about 10 seconds, and sometimes not at all. I have not attached a device to see if picture will play until I resolved this issue. I was thinking something happened to the software? But then again a few times when I hit "Input", after it waited for about a minute, it would bring up the Inputs screen like normal, but you cannot move the box to select anything. The only button on the remote that works correct is the power button, it will turn it off and on just fine. Any ideas? Any help would be much appreciated. I also downloaded the .epk file to a usb to try to update the software but it does not act like it recognizes the stick.

                                        Comment

                                        • tvtimmy
                                          Badcaps Legend
                                          • Mar 2015
                                          • 1160
                                          • usa
                                          #11
                                          Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

                                          You received a bad mainboard. It needs a re-balling or at least a re-flow.
                                          See if you can return it for another one.

                                            Comment

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