Announcement

Collapse
No announcement yet.

Samsung UN55D6005SF

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    #21
    Re: Samsung UN55D6005SF

    Originally posted by budm View Post
    Try having just the BL-ON wire disconnected and everything are back in place so you will get backlights, and if there is no other problem any where else then you should see image and sound and all other functions of the TV, if not then you have more than just no BL-ON signal.
    Ok so BL-ON disconnected and everything back into place when i power on the TV it flashes the splash screen and turns off.
    so no change on that...

    I must ask though if BL-ON is already at a voltage of 0 why would disconnecting it make any difference?
    Last edited by bleed4me; 11-11-2019, 01:50 PM.

    Comment


      #22
      Re: Samsung UN55D6005SF

      Originally posted by budm View Post
      Try having just the BL-ON wire disconnected and everything are back in place so you will get backlights, and if there is no other problem any where else then you should see image and sound and all other functions of the TV, if not then you have more than just no BL-ON signal.
      The only way I can keep the backlights on is if the mainboard is disconnected from the power board.

      Comment


        #23
        Re: Samsung UN55D6005SF

        Originally posted by bleed4me View Post
        Ok so BL-ON disconnected and everything back into place when i power on the TV it flashes the splash screen and turns off.
        so no change on that...

        I must ask though if BL-ON is already at a voltage of 0 why would disconnecting it make any difference?
        The BL-ON pin on the power supply board has pull-up resistors for performing power supply board self test, when the power supply board is connected to the main board, the main board will keep the BL-ON line low (<1V), when the TV is turned on then the main board allow the BL-ON to high turn on the backlights circuits.
        So at this point you have more than just BL-ON problem on the main board some where. If you check the Voltages at the power supply connectors you will find that some other control Voltages are not there either.
        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


          #24
          Re: Samsung UN55D6005SF

          Originally posted by budm View Post
          The BL-ON pin on the power supply board has pull-up resistors for performing power supply board self test, when the power supply board is connected to the main board, the main board will keep the BL-ON line low (<1V), when the TV is turned on then the main board allow the BL-ON to high turn on the backlights circuits.
          So at this point you have more than just BL-ON problem on the main board some where. If you check the Voltages at the power supply connectors you will find that some other control Voltages are not there either.
          Thank you for explaining that! I never understood how that worked but it makes sense now. Much appreciated.

          Does the PSON voltage need to be in the 5v range as well?

          Comment


            #25
            Re: Samsung UN55D6005SF

            PS-ON: <1V (typ.) = OFF, >2V (typ.) = ON
            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


              #26
              Re: Samsung UN55D6005SF

              Ok so we at least know that voltage is correct. Which voltages am I missing here?

              Comment


                #27
                Re: Samsung UN55D6005SF

                Originally posted by bleed4me View Post
                Ok so we at least know that voltage is correct. Which voltages am I missing here?
                You need to check the Voltages at the power supply connector pins that goes to the main board with connector in place but the BL-ON wire is not connected and see if they are all present or not, the chart is printed on the board.
                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


                  #28
                  Re: Samsung UN55D6005SF

                  Ok I just checkout out all the voltages on the powerboard with everything connected minus BL-ON and all the voltages are the exact same as when the BL-ON was connected.

                  Comment


                    #29
                    Re: Samsung UN55D6005SF

                    Are you saying you are getting exact same reading in post #5 or what? That is important info to be exact.
                    If you are getting the same readings then you need to disconnect the Dimming control line pin 10 (EPVW) also.
                    Your post #5 readings:
                    Power Supply
                    CNM803

                    Top
                    Pin 1 MC- not in use
                    Pin 2 B13V- 12.67v
                    Pin 3 B13V- 12.69v
                    Pin 4 VAMP- 18.5v
                    Pin 5 VAMP- 18.5v
                    Pin 6 GND- 0v
                    Pin 7 B5V- 5.3v
                    Pin 8 B5V-5.36v

                    Bottom
                    Pin9 MC- not in use
                    Pin 10 EPVW- 0v, At 0V there will be no backlights.
                    Pin 11 NC- 12.6v
                    Pin 12 BLU ON- 0v. it should show 2V or more at this point since the wire is not connected.
                    Pin 13 GND- 0v
                    Pin 14 GND- 0v
                    Pin 15 A5V- 5.3v
                    Pin 16 PSON- 3.3v
                    Last edited by budm; 11-15-2019, 12:22 AM.
                    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


                      #30
                      Re: Samsung UN55D6005SF

                      .
                      Last edited by nomoresonys; 11-15-2019, 04:51 AM.

                      Comment


                        #31
                        Re: Samsung UN55D6005SF

                        Sorry it took so long for me to respond its been a day

                        So I have rechecked all voltages and they were all the exact same as post #5. I even replaced the batteries in my meter just in case and all the voltages were the same.

                        Now that Pin 10epvw is disconnected i now get the voltages you were looking for and the backlight stays on when the tv is powered on.

                        Top
                        Pin 1 MC- not in use
                        Pin 2 B13V- 12.67v
                        Pin 3 B13V- 12.69v
                        Pin 4 VAMP- 18.5v
                        Pin 5 VAMP- 18.5v
                        Pin 6 GND- 0v
                        Pin 7 B5V- 5.3v
                        Pin 8 B5V-5.36v

                        Bottom
                        Pin9 MC- not in use
                        Pin 10 EPVW- 3.2v
                        Pin 11 NC- 12.6v
                        Pin 12 BLU ON- 3v
                        Pin 13 GND- 0v
                        Pin 14 GND- 0v
                        Pin 15 A5V- 5.3v
                        Pin 16 PSON- 3.3v[/B][/I][/QUOTE]

                        Comment


                          #32
                          Re: Samsung UN55D6005SF

                          I expect the backlights to stay on when you also disconnect the EPVW wire, so we do have backlights but nothing is shown on the screen, correct, if that is the case then something is really bad on the main board.
                          Do you get switched 12VDC feeding the T-CON fuse?
                          If not you have lots of problem with this main board, I do not know the exact cause, may be bad EEPROM, FW, BGA issue, etc.
                          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


                            #33
                            Re: Samsung UN55D6005SF

                            The screen will flash the splash logo then go to a dull lit grey screen.

                            When I check the voltage and fuse F102 on the T-con board i do get a voltage of 12.53.

                            Comment


                              #34
                              Re: Samsung UN55D6005SF

                              Good, so lets try again with having ribbon cable between T-CON and the LCD panel connected one at time to see what you will get, I want to see if you can get good half the screen and how long the image will stay on the screen.
                              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


                                #35
                                Re: Samsung UN55D6005SF

                                Tcon issue?

                                Comment


                                  #36
                                  Re: Samsung UN55D6005SF

                                  Ok please forgive the horrible pictures but when i disconnect the left tab and power on i get half the splash logo on the right but now on the left that is white vertical lines start to appear on the screen. Starts off as a single line and the longer it stays on the more that appear. If i disconnect the right side i get the exact same effects just opposite.
                                  Attached Files

                                  Comment


                                    #37
                                    Re: Samsung UN55D6005SF

                                    Originally posted by nomoresonys View Post
                                    Tcon issue?
                                    No, seems like a bad mainboard, forgot I already suggested it in post #7.
                                    Last edited by nomoresonys; 11-16-2019, 02:00 PM.

                                    Comment


                                      #38
                                      Re: Samsung UN55D6005SF

                                      So the question is just how bad is the mainboard and is it repairable?

                                      Comment


                                        #39
                                        Re: Samsung UN55D6005SF

                                        Some have but they are not near as easy to fix as powerboards imo.

                                        Comment


                                          #40
                                          Re: Samsung UN55D6005SF

                                          Fingers crossed because the mainboard online is nowhere to be found.

                                          Comment

                                          Working...
                                          X