Lg50pg3000 not working

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  • Ballvalve
    Member
    • Dec 2013
    • 11
    • Ireland
    #1

    Lg50pg3000 not working

    Mt tv packed up on Christmas night so I decided to take it apart today.
    I was watching it and then it just went black.i have taken out the top buffer and the bottom of the screen now comes on but if I press menu nothing comes up.
    I am going to change buffer pcb but is there anything else I should look out for
    Any advice
    Cheers
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: Lg50pg3000 not working

      Can you supply pictures of the circuit boards in the chassis? Buffer board failure is particularly common on these sets.
      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

        • Ballvalve
          Member
          • Dec 2013
          • 11
          • Ireland
          #3
          Re: Lg50pg3000 not working

          Here is pic one
          Attached Files

            Comment

            • Ballvalve
              Member
              • Dec 2013
              • 11
              • Ireland
              #4
              Re: Lg50pg3000 not working

              Pic two
              Attached Files

                Comment

                • Ballvalve
                  Member
                  • Dec 2013
                  • 11
                  • Ireland
                  #5
                  Re: Lg50pg3000 not working

                  Pic three
                  Attached Files

                    Comment

                    • Ballvalve
                      Member
                      • Dec 2013
                      • 11
                      • Ireland
                      #6
                      Re: Lg50pg3000 not working

                      Here is the buffer board I took out
                      Attached Files

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK
                          #7
                          Re: Lg50pg3000 not working

                          OK, top left of plasma panel (https://www.badcaps.net/forum/attach...2&d=1388265614), there is a sticker, marked: MODEL: PDP50K1##### (for example) What does your say?
                          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

                            • Ballvalve
                              Member
                              • Dec 2013
                              • 11
                              • Ireland
                              #8
                              Re: Lg50pg3000 not working

                              Pdp50g1####

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK
                                  #9
                                  Re: Lg50pg3000 not working

                                  OK, the manual for your plasma module (note: not TV, but the screen inside the TV with all the boards) is here, search for 50G1 to find the right page:



                                  With both buffers installed refer to the test points for Vsc and -Vy and confirm if the voltages are good.
                                  Then remove one buffer at a time and see if a voltage returns, if it is missing.

                                  You must use a digital meter and make sure to unplug the TV for at least 30 seconds before making -any- connection change.
                                  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

                                    • Ballvalve
                                      Member
                                      • Dec 2013
                                      • 11
                                      • Ireland
                                      #10
                                      Re: Lg50pg3000 not working

                                      Do I test these test points to earth and what voltage should I get. I have a fluke meter so should be able to test them
                                      Attached Files

                                        Comment

                                        • tom66
                                          EVs Rule
                                          • Apr 2011
                                          • 32560
                                          • UK
                                          #11
                                          Re: Lg50pg3000 not working

                                          You measure -across- the points indicated with the black and red as specified.
                                          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

                                            • Ballvalve
                                              Member
                                              • Dec 2013
                                              • 11
                                              • Ireland
                                              #12
                                              Re: Lg50pg3000 not working

                                              I have 154dc across by and 135 across vsc with the top buffer out.
                                              I have no voltage with across them with top buffer in place

                                                Comment

                                                • tom66
                                                  EVs Rule
                                                  • Apr 2011
                                                  • 32560
                                                  • UK
                                                  #13
                                                  Re: Lg50pg3000 not working

                                                  154V? Are you sure? Not 194V?
                                                  But yes looks like top buffer is bad.
                                                  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

                                                    • Ballvalve
                                                      Member
                                                      • Dec 2013
                                                      • 11
                                                      • Ireland
                                                      #14
                                                      Re: Lg50pg3000 not working

                                                      Ye defo 152 v dc .
                                                      Can I adjust this to 195vdc

                                                        Comment

                                                        • tom66
                                                          EVs Rule
                                                          • Apr 2011
                                                          • 32560
                                                          • UK
                                                          #15
                                                          Re: Lg50pg3000 not working

                                                          Just to make sure are you testing across the resistor marked Vy? If so yes try adjusting it up although I would not expect this to restore picture.
                                                          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

                                                            • Ballvalve
                                                              Member
                                                              • Dec 2013
                                                              • 11
                                                              • Ireland
                                                              #16
                                                              Re: Lg50pg3000 not working

                                                              It will only turn up to 154vdc.hopefully if I get a new top buffer board it'll work .
                                                              Cheers for the help

                                                                Comment

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