LG Flatron 42" Plasma

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  • luke10050
    Badcaps Veteran
    • Mar 2013
    • 209
    • Australia

    #1

    LG Flatron 42" Plasma

    i dont have model numbers for you but... i have this 42" LG Flatron that works fine, but after about 15 mins (when it gets hot i believe) it starts acting weirdly. the image starts going rainbow coloured (while still retaining the underlying image)(hinting that the Sync is all fine right???) then after that the entire image goes a deep red, then finally the screen goes black (while still doing that fuzzy thing that all plasma's do, with a bit of red). any ideas whats wrong at all? just looking for a general idea...
  • tw2005
    Badcaps Legend
    • Oct 2011
    • 6458
    • Australia

    #2
    Re: LG Flatron 42" Plasma

    I'd post the model, pictures of the problem, pictures of the boards and the board numbers. Someone may recognise the symptoms better that way.

    Comment

    • luke10050
      Badcaps Veteran
      • Mar 2013
      • 209
      • Australia

      #3
      Re: LG Flatron 42" Plasma

      thanks for the advice, ill get to it tomorrow, its mostly assembled atm and its dark D:

      Comment

      • luke10050
        Badcaps Veteran
        • Mar 2013
        • 209
        • Australia

        #4
        Re: LG Flatron 42" Plasma

        ok well this number is not 100% but an educated guess says its a LG RT-42PX10 42'' , same size same markings, same looking backplate and warning sticker and all... so it'd be a close match in the same series.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #5
          Re: LG Flatron 42" Plasma

          The exact model is important; LG are well known for changing parts between their models and only adding e.g. a single "A" to indicate a revision.
          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

          • luke10050
            Badcaps Veteran
            • Mar 2013
            • 209
            • Australia

            #6
            Re: LG Flatron 42" Plasma

            It is a R42PX11 AHYLKJ

            Comment

            • luke10050
              Badcaps Veteran
              • Mar 2013
              • 209
              • Australia

              #7
              Re: LG Flatron 42" Plasma

              https://www.badcaps.net/forum/showthread.php?t=15937 <- found this, seems pretty similar to this

              Comment

              • luke10050
                Badcaps Veteran
                • Mar 2013
                • 209
                • Australia

                #8
                Re: LG Flatron 42" Plasma

                so from what ive seen it could be the IPM failing due to a damaged PSU, so my logical assumption would be that i should start by acquiring an ESR meter and testing all the PSU caps correct? (and possibly other components) to ensure the fault will not replicate when i replace the IPM??? note: the tv is also emitting a loud staticy noise that i can confirm comes from both the PSU board and the Ysus and Zsus boards.
                Last edited by luke10050; 05-28-2013, 12:12 AM.

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #9
                  Re: LG Flatron 42" Plasma

                  The IPMs tend to fail on their own accord.
                  The PSU just needs to give good +180V (or Vs) and good 15V for the IPM to work, so if they are good, the PSU is probably good.
                  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

                  • luke10050
                    Badcaps Veteran
                    • Mar 2013
                    • 209
                    • Australia

                    #10
                    Re: LG Flatron 42" Plasma

                    ok i measured my Vs and it seems to be 183 volts... despite the panel saying 160v??? and i tried swapping the y-buffers, the lower buffer made it go all rainbow by itself, the upper normal. but the symptoms reappeared with the upper after 10 or so minutes

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #11
                      Re: LG Flatron 42" Plasma

                      160V would be very low for this type of panel.
                      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

                      • luke10050
                        Badcaps Veteran
                        • Mar 2013
                        • 209
                        • Australia

                        #12
                        Re: LG Flatron 42" Plasma

                        sorry Vs is 190, god im blind

                        Comment

                        • luke10050
                          Badcaps Veteran
                          • Mar 2013
                          • 209
                          • Australia

                          #13
                          Re: LG Flatron 42" Plasma

                          ok so its 189 now -_-

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #14
                            Re: LG Flatron 42" Plasma

                            I'd still expect a good image with Vs of 183V, though it may have a prominence of dead pixels. Not your rainbow effect.
                            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

                            • luke10050
                              Badcaps Veteran
                              • Mar 2013
                              • 209
                              • Australia

                              #15
                              Re: LG Flatron 42" Plasma

                              so you think its not related to the voltage, any ideas of the problems, all the detatchible fuses test out. Would pictures help?

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #16
                                Re: LG Flatron 42" Plasma

                                I am thinking ether -Vy bad, control board fault or main board fault. You can test -Vy on the Y-sus.
                                Picture of fault would help plus one of the chassis.
                                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

                                • luke10050
                                  Badcaps Veteran
                                  • Mar 2013
                                  • 209
                                  • Australia

                                  #17
                                  Re: LG Flatron 42" Plasma

                                  heres some pics, i apologise for the akwardness of them
                                  Attached Files

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #18
                                    Re: LG Flatron 42" Plasma

                                    The bottom is always blank? Or have you removed something?
                                    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

                                    • luke10050
                                      Badcaps Veteran
                                      • Mar 2013
                                      • 209
                                      • Australia

                                      #19
                                      Re: LG Flatron 42" Plasma

                                      the bottom y buffer is removed, sitting on my kitchen table

                                      Comment

                                      • luke10050
                                        Badcaps Veteran
                                        • Mar 2013
                                        • 209
                                        • Australia

                                        #20
                                        Re: LG Flatron 42" Plasma

                                        any ideas anyone?

                                        Comment

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