Samsung LE37A456C2D - image retention issue

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  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #21
    Re: Samsung LE37A456C2D - image retention issue

    Panel or t-con, main would not cause this, panel more likely.
    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.

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    • noledud
      Badcaps Veteran
      • Dec 2013
      • 413
      • united kingdom

      #22
      Re: Samsung LE37A456C2D - image retention issue

      ok thanks tom - i will try a tcon as i cant try a panel lol

      Comment

      • wreksta
        Badcaps Veteran
        • Aug 2013
        • 508
        • england

        #23
        Re: Samsung LE37A456C2D - image retention issue

        a lil bit info from expeirence could be the side ribbons if it has them down the left and right of the panel they are little one inch ribbon tabs with little component on

        you will have to remove the panel from the tv then the metal frame supports from the front of the panel
        i find if i only remove the top and the sides screws the frame will tilt toward you enough to gain access this way also secures the lcd in the frame

        drastic you may say but if it has them try pressuring it or slowly peel from panel watch picture if it improves remove whole tab

        this has worked for me with a few samsung A models

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        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #24
          Re: Samsung LE37A456C2D - image retention issue

          What??? Do NOT pull the tabs off!!! This kills the 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

          • wreksta
            Badcaps Veteran
            • Aug 2013
            • 508
            • england

            #25
            Re: Samsung LE37A456C2D - image retention issue

            tom i did say was drastic but i have had sucess in past by removing the very top far right tab and tv still lives and beautifull picture mate

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            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #26
              Re: Samsung LE37A456C2D - image retention issue

              Well, I would be extremely surprised if that didn't leave you with a dead panel. I suspect as this is a 720p AUO panel it uses only left or only right hand gate drivers anyway.
              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

              • noledud
                Badcaps Veteran
                • Dec 2013
                • 413
                • united kingdom

                #27
                Re: Samsung LE37A456C2D - image retention issue

                ok got the new tcon - bought as "tested"

                so i have good news and bad news

                good is the image retention does not happen anymore

                now the problem is colour washed out like an xray sort of thing

                iv read this is the gamma chip is that correct also how difficult is it to replace?
                Attached Files

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                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #28
                  Re: Samsung LE37A456C2D - image retention issue

                  Can you see any points marked VGAMA1 thru VGAMA22 or so? Test the voltage on each.
                  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.

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                  • noledud
                    Badcaps Veteran
                    • Dec 2013
                    • 413
                    • united kingdom

                    #29
                    Re: Samsung LE37A456C2D - image retention issue

                    this is bad IR tcon so i take it that refers to the IC in the top left of the pic ?
                    Attached Files

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                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #30
                      Re: Samsung LE37A456C2D - image retention issue

                      The group of test points marked VGAMA1, etc. You will have to find some of the missing ones (need to get all from VGAMA1 thru VGAMA22 or whatever it goes up to.)
                      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

                      • noledud
                        Badcaps Veteran
                        • Dec 2013
                        • 413
                        • united kingdom

                        #31
                        Re: Samsung LE37A456C2D - image retention issue

                        there are 16 points there and only 14 on the lable

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                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #32
                          Re: Samsung LE37A456C2D - image retention issue

                          There's a box around the gamma points. The other two are independent points for other signals.

                          You also need to find VGAMA3,4,5,9,18,19,20 which are going to be scattered elsewhere around the 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

                          • noledud
                            Badcaps Veteran
                            • Dec 2013
                            • 413
                            • united kingdom

                            #33
                            Re: Samsung LE37A456C2D - image retention issue

                            update on this - gamma tested bad - got a new chip installed and tv works fine now

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                            • comptek
                              Badcaps Veteran
                              • Aug 2013
                              • 606
                              • uk

                              #34
                              Re: Samsung LE37A456C2D - image retention issue

                              Hi All i have the same issue on the same tv
                              but the picture makes everyone look like Dale Winton or Des O'connor
                              Dark picture all over and has image retention swapped t-con and still the same

                              any ideas please
                              Regards
                              Gary

                              Comment

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

                                #35
                                Re: Samsung LE37A456C2D - image retention issue

                                Originally posted by comptek
                                Hi All i have the same issue on the same tv
                                but the picture makes everyone look like Dale Winton or Des O'connor
                                Dark picture all over and has image retention swapped t-con and still the same

                                any ideas please
                                Regards
                                Gary
                                Check Gamma Voltages as described above. Chances are you bought a duff T-Con.
                                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!

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                                • comptek
                                  Badcaps Veteran
                                  • Aug 2013
                                  • 606
                                  • uk

                                  #36
                                  Re: Samsung LE37A456C2D - image retention issue

                                  will try thank you Alastair

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