Inverted Colouras on Samsung LE37M87BD

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  • Mikeyboy2007
    Badcaps Veteran
    • Mar 2013
    • 745
    • Scotland

    #1

    Inverted Colouras on Samsung LE37M87BD

    hi guys bought this telly form someone (as faulty) , plugged it in and all the colours are inverted, there was a buzzing coming from the tv and after i turned down contrast etc the buzzing went away. any ideas ? also went into service menu and changed DDR to Samsung.
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Inverted Colouras on Samsung LE37M87BD

    Pic of fault?
    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

    • Mikeyboy2007
      Badcaps Veteran
      • Mar 2013
      • 745
      • Scotland

      #3
      Re: Inverted Colouras on Samsung LE37M87BD

      hi Tom, attached picture, also there is a little ghosting on the picture too.
      Attached Files

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: Inverted Colouras on Samsung LE37M87BD

        Could be GAMMA or LVDS/FORMAT fault. A natural image (a face is best due to the smooth gradients) can help narrow down the exact fault.

        First check LVDS cable seated properly both ends, no corrosion on any pins, no bent pins.

        If that passes enter service menu and check LVDS format option: there may be a few, JEIDA is one of them. Try each and see if picture gets better. Also check panel setitng is correct - AMLCD 37" for example is SAMSUNG 37" panel. Note down all settings before changing them.

        Should those fail then a picture of the T-con is necessary to check gamma voltages.
        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

        • Mikeyboy2007
          Badcaps Veteran
          • Mar 2013
          • 745
          • Scotland

          #5
          Re: Inverted Colouras on Samsung LE37M87BD

          hi Tom, couldn't find LVDS option anywhere on the service menu ?

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: Inverted Colouras on Samsung LE37M87BD

            What options do you have?
            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

            • Mikeyboy2007
              Badcaps Veteran
              • Mar 2013
              • 745
              • Scotland

              #7
              Re: Inverted Colouras on Samsung LE37M87BD

              hope this helps Tom.
              Attached Files

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: Inverted Colouras on Samsung LE37M87BD

                Ok, looks like no option for LVDS format, so time to focus on t-con.... good clear photo required.
                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

                • Mikeyboy2007
                  Badcaps Veteran
                  • Mar 2013
                  • 745
                  • Scotland

                  #9
                  Re: Inverted Colouras on Samsung LE37M87BD

                  Tom cant get a clear enough picture, broke my camera and my phone camera is a pile of sh*t... the T-Con board thats on it is T370HW02 V0. looked it up on ebay and they have a repair service for this specific board, costs £75 though and dont realy wanna spend that kinda cash when it might not even be the fault, the pins on the LVDS cable took fine and the board itself looks in excellent condition.

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #10
                    Re: Inverted Colouras on Samsung LE37M87BD

                    Same board as this one:
                    https://www.badcaps.net/forum/showth...ng+LN37A550P3F
                    Never stop learning
                    Basic LCD TV and Monitor troubleshooting guides.
                    http://www.badcaps.net/forum/showthr...956#post305956

                    Voltage Regulator (LDO) testing:
                    http://www.badcaps.net/forum/showthr...999#post300999

                    Inverter testing using old CFL:
                    http://www.badcaps.net/forum/showthr...er+testing+cfl

                    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                    http://s807.photobucket.com/user/budm/library/

                    TV Factory reset codes listing:
                    http://www.badcaps.net/forum/showthread.php?t=24809

                    Comment

                    • Mikeyboy2007
                      Badcaps Veteran
                      • Mar 2013
                      • 745
                      • Scotland

                      #11
                      Re: Inverted Colouras on Samsung LE37M87BD

                      no Budm its exact same one attached (taken from Google images)
                      Attached Files

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #12
                        Re: Inverted Colouras on Samsung LE37M87BD

                        I see, my version is 402, it does use the same AS15 Gamma Vref IC.
                        Never stop learning
                        Basic LCD TV and Monitor troubleshooting guides.
                        http://www.badcaps.net/forum/showthr...956#post305956

                        Voltage Regulator (LDO) testing:
                        http://www.badcaps.net/forum/showthr...999#post300999

                        Inverter testing using old CFL:
                        http://www.badcaps.net/forum/showthr...er+testing+cfl

                        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                        http://s807.photobucket.com/user/budm/library/

                        TV Factory reset codes listing:
                        http://www.badcaps.net/forum/showthread.php?t=24809

                        Comment

                        • Mikeyboy2007
                          Badcaps Veteran
                          • Mar 2013
                          • 745
                          • Scotland

                          #13
                          Re: Inverted Colouras on Samsung LE37M87BD

                          do you think that could be the problem ? how easy is it to fix, i have some soldering skills but dont think i could do something that complicated.....

                          Comment

                          • Mikeyboy2007
                            Badcaps Veteran
                            • Mar 2013
                            • 745
                            • Scotland

                            #14
                            Re: Inverted Colouras on Samsung LE37M87BD

                            Originally posted by budm
                            I see, my version is 402, it does use the same AS15 Gamma Vref IC.
                            is that whats in place U603 ?

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #15
                              Re: Inverted Colouras on Samsung LE37M87BD

                              U21 in your picture, and I believe the test points that Tom wants you to test is the row on the top right close to that IC. Tom can give you more details about testing those voltages.
                              Never stop learning
                              Basic LCD TV and Monitor troubleshooting guides.
                              http://www.badcaps.net/forum/showthr...956#post305956

                              Voltage Regulator (LDO) testing:
                              http://www.badcaps.net/forum/showthr...999#post300999

                              Inverter testing using old CFL:
                              http://www.badcaps.net/forum/showthr...er+testing+cfl

                              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                              http://s807.photobucket.com/user/budm/library/

                              TV Factory reset codes listing:
                              http://www.badcaps.net/forum/showthread.php?t=24809

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #16
                                Re: Inverted Colouras on Samsung LE37M87BD

                                You should test the points marked VGAMA1 thru VGAMA22. Meter on 20V DC, board installed in TV and showing pic, red pin on test point and black on chassis ground. Report your readings.
                                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

                                • Mikeyboy2007
                                  Badcaps Veteran
                                  • Mar 2013
                                  • 745
                                  • Scotland

                                  #17
                                  Re: Inverted Colouras on Samsung LE37M87BD

                                  sorry for late reply guys, Tom did what you said got following readings..hope this helps..

                                  VGAMA1 0.02
                                  VGAMA2 0.18
                                  VGAMA3 0.29
                                  VGAMA4 1.84
                                  VGAMA5 3.39
                                  VGAMA6 4.92
                                  VGAMA7 9.85
                                  VGAMA8 12.35
                                  VGAMA9 12.81-12.87 (was jumping up and down)
                                  VGAMA10 12.92
                                  VGAMA11 7.62
                                  VGAMA12 15.02
                                  VGAMA13 15.41
                                  VGAMA14 15.38
                                  VGAMA15 15.15
                                  VGAMA16 14.84
                                  VGAMA17 14.25
                                  VGAMA18 14.14
                                  VGAMA19 14.03
                                  VGAMA20 14.01
                                  VGAMA21 14.01
                                  VGAMA22 14.00

                                  Comment

                                  • budm
                                    Badcaps Legend
                                    • Feb 2010
                                    • 40746
                                    • USA

                                    #18
                                    Re: Inverted Colouras on Samsung LE37M87BD

                                    It is bad.
                                    Never stop learning
                                    Basic LCD TV and Monitor troubleshooting guides.
                                    http://www.badcaps.net/forum/showthr...956#post305956

                                    Voltage Regulator (LDO) testing:
                                    http://www.badcaps.net/forum/showthr...999#post300999

                                    Inverter testing using old CFL:
                                    http://www.badcaps.net/forum/showthr...er+testing+cfl

                                    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                    http://s807.photobucket.com/user/budm/library/

                                    TV Factory reset codes listing:
                                    http://www.badcaps.net/forum/showthread.php?t=24809

                                    Comment

                                    • Mikeyboy2007
                                      Badcaps Veteran
                                      • Mar 2013
                                      • 745
                                      • Scotland

                                      #19
                                      Re: Inverted Colouras on Samsung LE37M87BD

                                      is it repairable Budm or will i just have to replace it ?

                                      Comment

                                      • Mikeyboy2007
                                        Badcaps Veteran
                                        • Mar 2013
                                        • 745
                                        • Scotland

                                        #20
                                        Re: Inverted Colouras on Samsung LE37M87BD

                                        would this one do the same job, same number but from a different tv of a different size?

                                        http://www.ebay.co.uk/itm/VIZIO-GV42...item27df6b3c9d

                                        Comment

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