L.G. 42PC1D, dark flickering pic.

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

    #1

    L.G. 42PC1D, dark flickering pic.

    Have this L.G. with the above fault. Maybe unrelated, but also has some red sparkles,--but only on black/very dark parts of the picture.

    When first on, it has a reasonable pic--apart from the sparkles on black, but then after about 15 mins will mess around, going from a fair pic to dark, flickering brighter Guessing the sparkles need the software update thats mentioned in other threads....

    At work, I'm pretty sure I have some software and cables to do this update, will have to check--defo something for LG sets, a CD and a serial-cable I think.....

    Also--when the pic goes dark--the colours go psychodelic--like a cartoon interpretation of a 60's acid-trip!

    Checked the voltages--seem good, all are within a volt or so.

    Any ideas....?
    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!
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: L.G. 42PC1D, dark flickering pic.

    Check Vs, Va, -Vy, Vsc and Vzbias before and after fault.
    Panel model PDP42X3?
    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: L.G. 42PC1D, dark flickering pic.

      Hi Tom!--How you doing?

      Yes,--Its a PDP 42X3 panel. --What is known about these, anything common faultish?

      Checks earlier were rather quick, as not all the test-points are obvious--or at least I didnt see them!

      Va, Vs and I think -Vy were good though....
      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: L.G. 42PC1D, dark flickering pic.

        See here for volt checks:


        Common faults -- usually the damn IPMs!
        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: L.G. 42PC1D, dark flickering pic.

          Ah--Cheers!

          As to IPM's, I noticed the Z-sus IPM is nearly stone cold, while the Y-sus IPM is warm, but not hot...

          Thanks, I'll check the voltages in working and fault conditions,--but will have to wait till tomorrow eve....
          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

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

            #6
            Re: L.G. 42PC1D, dark flickering pic.

            Here are the results of the voltage-checks....

            Vs, 186v constant and correct to label.

            Va 60v constant and correct to label.

            -Vy 130-160 varying, re-set to close to 200, but varies between 190 and 210v
            --Label says 200 for this value. Difficult with DVM to read exactly the variance--but its around those values.

            Vsc, should be 120, but varying between110 and 120 ish--difficult to see, should break out my Avo-8 analogue meter!

            Vbias was correct at 200 to label and constant no variance.

            Z-Sus IPM still stone-cold, and Y-sus IPM tepid/warm. I did pull the Vs fuse on the Z-sus to see the effect.
            --I had a dark but constant slow to refresh picture--that didnt flicker, but with poor colour...

            Is this looking like an IPM or is one of the DC-DC converters of the Y-sus messing round...?



            Ive not done any firmware updating--tracking down a windows XP machine!
            Last edited by Alastair E; 01-21-2014, 03:01 PM.
            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

              #7
              Re: L.G. 42PC1D, dark flickering pic.

              You checked Vsc and Vzbias 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

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

                #8
                Re: L.G. 42PC1D, dark flickering pic.

                Sorry--Yes, You were too fast for me, I just edited when I noticed I missed them out...

                Vsc varying somewhat and Vzbias correct and constant
                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

                  #9
                  Re: L.G. 42PC1D, dark flickering pic.

                  I would consider the possibility that you have two faults. Can you post a picture of the Z-sustain board?
                  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.

                    #10
                    Re: L.G. 42PC1D, dark flickering pic.

                    [/URL][/IMG]

                    and y-sus--poor pic, all the frame is in the way...

                    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

                      #11
                      Re: L.G. 42PC1D, dark flickering pic.

                      OK, bottom left of Z-sus. Check voltage across one of those red caps. Should be around 60 to 150V. Also should match voltage on similar bank of red caps on Y-sus.

                      Sure about 200V Vzbias?
                      Vzbias, as a rule, always less than Vs and also, is usually around 80V to 130V.
                      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.

                        #12
                        Re: L.G. 42PC1D, dark flickering pic.

                        Ah--Yes, sorry, been battling with various Vestels this afternoon--Head's gone!

                        That Vzbias is 100V dead and constant--correct to label.

                        The voltage across the red-caps of Z-sus is 140-158 varying....

                        The voltage on the 5 red caps of Y-sus is 95 constant.
                        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

                          #13
                          Re: L.G. 42PC1D, dark flickering pic.

                          You have a bad IPM on the Z-sustain, I think. You can verify this theory if you have an oscilloscope, do you?
                          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.

                            #14
                            Re: L.G. 42PC1D, dark flickering pic.

                            Yup--I have a scope, but will have to wait till tomorrow eve--Need to wind down--gotta get up for work at 6am!

                            What should I be checking for--guess that ramp waveform on its output...?

                            Do you still reckon I may have two faults--or was that because I messed up with the voltage-readings in previous posting?
                            A big thank you for taking the trouble to help--If you need any Vestel stuff, I have loads, you are welcome....
                            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

                              #15
                              Re: L.G. 42PC1D, dark flickering pic.

                              The Z-sus waveform is simpler, no ramps. Just a Vzbias point and a sustain portion.
                              What Vestel bits have you got?
                              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.

                                #16
                                Re: L.G. 42PC1D, dark flickering pic.

                                PSU's, Mains, TFT's (some) T-Cons, BL boards--you name it, various series from 17MB12 to 17MB90....

                                Prolly got 30-40 mains and PSU's.....
                                --Been a good (bad) week, scrapped around 6 Vestels today with cracked TFT....
                                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

                                  #17
                                  Re: L.G. 42PC1D, dark flickering pic.

                                  I will keep you in mind. I repair vestels now and then if I get them cheap, but I hate them with an absolute passion.
                                  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

                                  • vinceroger69
                                    Badcaps Legend
                                    • Mar 2012
                                    • 6714
                                    • uk

                                    #18
                                    Re: L.G. 42PC1D, dark flickering pic.

                                    Originally posted by Alastair E
                                    PSU's, Mains, TFT's (some) T-Cons, BL boards--you name it, various series from 17MB12 to 17MB90....

                                    Prolly got 30-40 mains and PSU's.....
                                    --Been a good (bad) week, scrapped around 6 Vestels today with cracked TFT....
                                    hi alastair i have 2 sets here both have vestels mains can i send you the board numbers to see if you them them as i strugling to find them.


                                    will pm you the main board details save messing up the thread cheers
                                    Last edited by vinceroger69; 01-21-2014, 04:43 PM.

                                    Comment

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

                                      #19
                                      Re: L.G. 42PC1D, dark flickering pic.

                                      Originally posted by tom66
                                      I will keep you in mind. I repair vestels now and then if I get them cheap, but I hate them with an absolute passion.
                                      You and me too! I picked up a JVC today off the pile, and thought--Ah, a nice straightforward Japanese type PSU needing 3300uF caps....
                                      (I work at the local recycling-centre--Fixing tellys for re-sale!)

                                      Was it hell--A bloody Vestel in disguise--Havent seen one wear a JVC badge before though....

                                      I have a 3 foot pile of those hideous 22" Technikas with the DVD that never works that Tescos sell, one Saturday a while back--I secretly took one and jumped on it till it was merely bits!--Most satisfying!

                                      Vinceroger--OK, I'll have a look through--What you got?
                                      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

                                        #20
                                        Re: L.G. 42PC1D, dark flickering pic.

                                        JVC, Sanyo, Hitachi, Sharp and Toshiba below 42" and not Smart: They are ALL VESTEL SHIT...

                                        It pisses me off SO MUCH.

                                        And you see people review a Toshiba 32" LCD giving it great reviews, great performance, etc. When they review the equivalent Celcus, Technika, etc. it gets poor reviews. Brand blindness is what I'd call it.
                                        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

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