Samsung UN55D6450 turns itself off and on endlessly, no blinks

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • nroberto13
    Member
    • Feb 2014
    • 22
    • Germany

    #101
    Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

    does it have a part number? or any kind of identification data on it?

    Comment

    • nroberto13
      Member
      • Feb 2014
      • 22
      • Germany

      #102
      Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

      oh, sorry, didn't notice it at first sight ..

      Comment

      • nroberto13
        Member
        • Feb 2014
        • 22
        • Germany

        #103
        Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

        ok, so what i understand is that each strip is divided in 4 independently driven sections.

        According to the fast-track:

        LED Drive Voltages (CNL802 A&B):
        1.Positive Pins Lx+ & Rx+: (38Vdc)
        2.Negative Pins Lx- & Rx-: (1 ~ 10Vdc)
        1.1Vdc = Brighter screen
        2.10Vdc = Darker screen

        I guess the brightness is controlled via voltage. higher voltage brighter led. So I would think of 4 pairs of LX- and Lx+ for one side strip, but the board has 8 pairs of Lx- and Lx+ for each side.

        Any clues why are 8 pairs instead of 4?
        Attached Files

        Comment

        • mmartell
          Badcaps Legend
          • Oct 2013
          • 3189
          • Canada

          #104
          Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

          Don't recall if that was ever explained.

          Comment

          • nroberto13
            Member
            • Feb 2014
            • 22
            • Germany

            #105
            Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

            any way to bypass the backlight LED's functionality check? maybe to simulate somehow the current consumption... at least I could check if that's the issue and everything else works. thanks.

            or a schematic for bn44-00427A/B ?
            Last edited by nroberto13; 04-06-2014, 04:56 AM.

            Comment

            • withalligators
              Badcaps Veteran
              • Jun 2013
              • 267
              • USA

              #106
              Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

              Well, I got a little over a year on this thing. LEDs started flickering again yesterday and it won't stay on. Should I try and replace the PS board as well as the LED strip, to prevent this from happening again?

              Also, do we think the LED strips are interchangeable from left to right? Or is there some kind of zoning?

              Comment

              • j8r8mi
                New Member
                • Aug 2015
                • 1
                • United States

                #107
                Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                I had the same issue with my 42 inch TV. I worked on it for a long time and found this thread. I never considered that it could be the LED check. What I did was jumper the connection from the known "good" led to the one having the issue.

                It seems unlike the other TVs and checks, including the fast track, this particular TV has each LED driven individually. Referring to post #103 picture, there are two connectors driving each LED, with a positive and negative.

                If the Left LED 1 is flickering, L1, (Pins 7 and 5) you can test this by jumping to a known working LED. In my case, L5 was fine, so I jumped Pin 7 to Pin 8 (-) and ping 5 and pin 6 (+). This caused the LED to function normally and prevented the on/off cycle. (And made the TV usable again)

                Mine is definitely a power board issue, but I was able to hold off on buying a new one by doing this. Hope this helps and thanks for all of the help.

                Comment

                • Louis82
                  Badcaps Veteran
                  • Feb 2012
                  • 240
                  • USA

                  #108
                  Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                  I have same tv UN55D64 which it plays for a minute, then goes off and comes back on again. I have fully resoldered my power supply as many of you have found loose connections on it but still same issue. I wanted to isolate the problem by disconnection main board from power board but the screen or backlight on this tv do not come on automatically after disconnecting the main board.

                  So I tried the typical jump on PS-ON to A5V and the power turned on as I get 13V on some of the pins but no backlight. I jumped the BLU-ON to one of the B5V and a huge spark happened to the point that my connector melted a little bit.

                  Can any of you indicate how I can turn on the Backlight on this tv by using a jump or resistor? I want to test which board is the one that is causing the shut down.

                  Thank you.
                  Attached Files

                  Comment

                  • Louis82
                    Badcaps Veteran
                    • Feb 2012
                    • 240
                    • USA

                    #109
                    Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                    Anybody?

                    Comment

                    • djluis
                      Member
                      • Apr 2011
                      • 12

                      #110
                      Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                      Disconecting main will turn on backlight led strips, verified.

                      Comment

                      • Louis82
                        Badcaps Veteran
                        • Feb 2012
                        • 240
                        • USA

                        #111
                        Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                        @Djluis: My tv is fixed. The power supply BN44-00428B doesn't turn on the backlight by disconnecting it from main board. I'm attaching the procedure I followed to get backlights on. Thanks for your time. My tv model is UN55D6450
                        Attached Files

                        Comment

                        Related Topics

                        Collapse

                        • Document Archive
                          Samsung Galaxy Book 2 Notebook Specification for Upgrade or Repair
                          by Document Archive
                          This specification for the Samsung Galaxy Book 2 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Galaxy Book 2 boardview and Galaxy Book 2 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...
                          09-07-2024, 05:50 AM
                        • Egidio85
                          Samsung UE55F8000SZ Turns on and off immediately
                          by Egidio85
                          good morning, I have a samsung UE55F8000SZ tv that turns on, shows the logo and turns off after 1-2 seconds.
                          This defect happens continuously, hearing the classic click of the relay every time.

                          Power supply board BN44-00636B

                          disconnecting the mains and lamps from the power board always causes the same problem.
                          Is it normal that without anything connected this power supply turns on and off cyclically?
                          any suggestions on what to check?

                          thanks in advance
                          03-11-2025, 12:45 PM
                        • Document Archive
                          Samsung Galaxy Book Ion NP950XCJ Notebook Specification for Upgrade or Repair
                          by Document Archive
                          This specification for the Samsung Galaxy Book Ion NP950XCJ Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the NP950XCJ boardview and NP950XCJ schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...
                          09-06-2024, 11:40 PM
                        • Document Archive
                          Samsung Galaxy Book Ion NP930XCJ Notebook Specification for Upgrade or Repair
                          by Document Archive
                          This specification for the Samsung Galaxy Book Ion NP930XCJ Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the NP930XCJ boardview and NP930XCJ schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...
                          09-06-2024, 11:40 PM
                        • Document Archive
                          Samsung Galaxy Book Ion NP950XCJ Notebook Specification for Upgrade or Repair
                          by Document Archive
                          This specification for the Samsung Galaxy Book Ion NP950XCJ Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the NP950XCJ boardview and NP950XCJ schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...
                          09-06-2024, 08:40 PM
                        • Loading...
                        • No more items.
                        Working...