PANGOO PT-50S18 aka LG 50PG3000 chassis

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  • Alastair E
    Chief Womble
    • Mar 2013
    • 1963
    • U.K.
    #1

    PANGOO PT-50S18 aka LG 50PG3000 chassis

    Ive never heard of this make, but looks like the main PDP is an LG 50PG3000 chassis.

    It had no picture or sound, Vs Va present, No VSC

    Removing Buffers and VSC returned. Replacing just bottom buffer gave a mal-discharge half raster.

    I traced the faulty buffer chip--The Top One-- and carefully removed it with hot air. No damage was caused.

    I replaced the top buffer and expected a picture--But all I get is the panel initialising and thats it. No sound and tried running the built-in test from the control-board by disconnecting the LVDS and linking the Ext_Auto_Gen but no change.

    Cant see what input its on, but tried pressing buttons, supplying HDMI and antenna to see if I could get sound, none at all.

    Do ALL the buffer chips need to be present for Anything to appear on the screen?

    Guess I'll chuck a buffer-chip in when I get one and see if that helps....
    TELEFIX

    How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
    http://www.irf.com/technical-info/appnotes/an-1088.pdf
    PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: PANGOO PT-50S18 aka LG 50PG3000 chassis

      One many plasmas, the data enters the top IC and then travels down to the bottom IC. So the top IC needs to be present.
      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

        • Alastair E
          Chief Womble
          • Mar 2013
          • 1963
          • U.K.
          #3
          Re: PANGOO PT-50S18 aka LG 50PG3000 chassis

          Aye-Tom's Correct again!

          I just traced the dataline, it goes to the top IC on one pin and appears to go to another pin inside that chip that then connects to the same I/P data-pin on the next IC down....

          Wonder what would happen if I bridged them.....Hmmm.......
          TELEFIX

          How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
          http://www.irf.com/technical-info/appnotes/an-1088.pdf
          PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: PANGOO PT-50S18 aka LG 50PG3000 chassis

              Bridging will shift the panel down by one IC. Excess data from the bottom IC should be discarded.
              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

                • Alastair E
                  Chief Womble
                  • Mar 2013
                  • 1963
                  • U.K.
                  #5
                  Re: PANGOO PT-50S18 aka LG 50PG3000 chassis

                  Originally posted by tom66
                  Bridging will shift the panel down by one IC. Excess data from the bottom IC should be discarded.

                  Ha!--Thats what I was expecting too.....

                  Reality however is somewhat different. Looks like there's some other 'data' or 'Address' line thats linked through the top IC too.

                  What I get is the first (Top IC) part of panel blank--No surprise there, but second IC part of panel is producing its correct part of picture--ie, its not displaced downwards as expected.

                  Everything down after that--To the bottom of Top Buffer is correctly displayed.

                  Below that, (Bottom buffer) just very dark grey--Panel initialised, with no image at all.
                  --Didnt forget to plug back in the small5 way link-lead between buffers either....

                  At least Ive proved the Signals side and most of the rest of the set is actually working.

                  Ive a couple of buffer-chips on order, so we see what happens....
                  TELEFIX

                  How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
                  http://www.irf.com/technical-info/appnotes/an-1088.pdf
                  PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK
                      #6
                      Re: PANGOO PT-50S18 aka LG 50PG3000 chassis

                      Ah on some sets there is odd and even data so you might need to connect both I'm not sure.
                      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

                        • Alastair E
                          Chief Womble
                          • Mar 2013
                          • 1963
                          • U.K.
                          #7
                          Re: PANGOO PT-50S18 aka LG 50PG3000 chassis

                          Think I'll just wait till the buffer chip comes in.....

                          I just wanted to see if the mainboard was still alive--looks like it is....
                          TELEFIX

                          How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
                          http://www.irf.com/technical-info/appnotes/an-1088.pdf
                          PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

                            Comment

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