lg 50ps3000 flaashes then screen goes off

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  • wreksta
    Badcaps Veteran
    • Aug 2013
    • 508
    • england

    #1

    lg 50ps3000 flaashes then screen goes off

    Hi all I have a lg 50ps3000 thAt had red haze ordered a repair kit from ebay
    I fitted it and now tv will turn on and flash the screen once
    If I disconnect the zsus from the control board tv will come on flashing a black screen
    With a red lined alternatating across the screen

    Any ideas people
  • wreksta
    Badcaps Veteran
    • Aug 2013
    • 508
    • england

    #2
    Re: lg 50ps3000 flaashes then screen goes off

    Anyone help could the ldvs control board cause it

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #3
      Re: lg 50ps3000 flaashes then screen goes off

      Try jumpering EXT AUTO GEN on control board with the LVDS cable out - do test patterns do this - pic or video of screen with fault would help too.
      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

      • wreksta
        Badcaps Veteran
        • Aug 2013
        • 508
        • england

        #4
        Re: lg 50ps3000 flaashes then screen goes off

        Hi tom can't find the service man for this one any help on which pins there's a plugin type connector with 4 pins above the the word ex auto gen

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #5
          Re: lg 50ps3000 flaashes then screen goes off

          Pic of it?
          What's the panel model number for example PDP50J3#### (not same as "50PS3000")

          SM:
          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

          • wreksta
            Badcaps Veteran
            • Aug 2013
            • 508
            • england

            #6
            Re: lg 50ps3000 flaashes then screen goes off

            Need help with this ext auto gen as there 4 pins

            Panel is pdp50h30001

            Comment

            • ahmednesar
              New Member
              • Jan 2014
              • 3
              • Saudi Arabia

              #7
              Re: lg 50ps3000 flaashes then screen goes off

              Lg 42pg20r-ta
              ===========
              hi i am ahmedn esar from saudi arabia . please any one help me my LG lcd tv (Lg 42pg20r-ta full display red color) sum system change now not open power on green light display black how to solve give solutions.

              Comment

              • ahmednesar
                New Member
                • Jan 2014
                • 3
                • Saudi Arabia

                #8
                Re: lg 50ps3000 flaashes then screen goes off

                Lg 42pg20r-ta
                hi i am ahmed nesar from saudi arabia . please any one help me my LG lcd tv (Lg 42pg20r-ta full display red color) sum system change now not open power on green light display black how to solve give me solutions.

                my email :ahmednesar33@gmail.com

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #9
                  Re: lg 50ps3000 flaashes then screen goes off

                  Picture of the control board with this 4 pin header?
                  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

                  • wreksta
                    Badcaps Veteran
                    • Aug 2013
                    • 508
                    • england

                    #10
                    Re: lg 50ps3000 flaashes then screen goes off

                    This here sorry bout pic

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #11
                      Re: lg 50ps3000 flaashes then screen goes off

                      I don't know how to activate that one I'm afraid, not seen that before, it might be a combination of pins, or you need an external jig from LG.
                      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

                      • freakaftr8
                        Badcaps Legend
                        • Oct 2012
                        • 3743
                        • USA

                        #12
                        Re: lg 50ps3000 flaashes then screen goes off

                        You Can try jumping The Two End Pads I Believe Look At The Traces On The Board. Take a good pic of it and post
                        Last edited by freakaftr8; 01-18-2014, 04:33 PM.
                        Did I leave the soldering iron on?

                        Comment

                        • freakaftr8
                          Badcaps Legend
                          • Oct 2012
                          • 3743
                          • USA

                          #13
                          Re: lg 50ps3000 flaashes then screen goes off

                          AActually now looking more into it I believe that it requires a test jig like tom66 suggested.
                          Did I leave the soldering iron on?

                          Comment

                          • wreksta
                            Badcaps Veteran
                            • Aug 2013
                            • 508
                            • england

                            #14
                            Re: lg 50ps3000 flaashes then screen goes off

                            Another control board arrived and picture was real messed up very bright and speckled redish for a while now tv just turns with quick screen flash on off again on you can hear the zsus buzz then stop

                            All voltages from psu to ysus and zsus are correct to panel could ghid bright picture have damaged a board I checked zsus mosfets they seem fine I cant read there resistance though

                            hrlp
                            Last edited by wreksta; 01-29-2014, 12:50 PM.

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #15
                              Re: lg 50ps3000 flaashes then screen goes off

                              I think what causes this failure is the control board going bad - capacitors.

                              So if you put a dud control board into a set it could blow the Y- or Z-sustain. Usually the Z-sustain goes first.

                              Bright picture suggests VE voltage too high followed by a sustain board failing.

                              You may need a scope to check waveforms out of each board and see if there are any anomalies.
                              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

                              • wreksta
                                Badcaps Veteran
                                • Aug 2013
                                • 508
                                • england

                                #16
                                Re: lg 50ps3000 flaashes then screen goes off

                                I have correct va and vs from psu to both boards theres no mention of ve on the panel or where to tune from

                                I have all new caps on other control board I can replace them if need be is there a way to get a pic on this model without zsus

                                Recap control board can make tv turn on flash and kill screen

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #17
                                  Re: lg 50ps3000 flaashes then screen goes off

                                  Sorry Ve is Samsung/Panasonic, on LG it is Vzbias or Vzb. On Z-sustain.
                                  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

                                  • wreksta
                                    Badcaps Veteran
                                    • Aug 2013
                                    • 508
                                    • england

                                    #18
                                    Re: lg 50ps3000 flaashes then screen goes off

                                    Thats not written down on panel but I could not get it down past 192v on zsus

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #19
                                      Re: lg 50ps3000 flaashes then screen goes off

                                      Way too high, normally around 90~100V. See here:


                                      Search 50H3 panel to find how to read labels and check Vzb, -Vy and Vsc voltage.

                                      Too high will "overbright" panel. On well made TV, it will shut down Vs supply due to overload, but these LGs just love to fry stuff instead.
                                      Last edited by tom66; 01-29-2014, 01:15 PM.
                                      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

                                      • wreksta
                                        Badcaps Veteran
                                        • Aug 2013
                                        • 508
                                        • england

                                        #20
                                        Re: lg 50ps3000 flaashes then screen goes off

                                        That s what its doing shutting it down the picture that is what could bd causing fhe high vzb

                                        Comment

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