Samsung UN55D6450 turns itself off and on endlessly, no blinks

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • withalligators
    Badcaps Veteran
    • Jun 2013
    • 267
    • USA

    #1

    Samsung UN55D6450 turns itself off and on endlessly, no blinks

    That's the simple gist of it, my friend has a Sammy UN55D6450 that when plugged in turns itself on (relay clicks, backlight turns on) and then instantly shuts itself off. A few seconds later it repeats this process. He'll let me have it for 250. What do we think? Seems fixable. Main board? I haven't opened it or anything.
    Cheers,
    Alex
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

    I'd be thinking main board or t-con, is picture visible just as it cuts off? Could be shorted LED strip 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

    • withalligators
      Badcaps Veteran
      • Jun 2013
      • 267
      • USA

      #3
      Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

      It shuts off too quickly. Granted, I didn't have a video source hooked up, but sammys display a logo when they boot on, right? Anyway, this sounds fixable to me. Do you much smarter guys concur? I can pick up today or I have to wait a week.

      Cheers,
      Alex
      Last edited by withalligators; 08-06-2013, 10:42 AM.

      Comment

      • capkid
        Badcaps Legend
        • Oct 2010
        • 1339
        • United States

        #4
        Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

        It sounds fixable, and I'd be thinking main board, also. I'd probably buy it, although I'd have a hard time paying $250 (just my cheapness with regard to non-necessities ). It looks like a nice TV.
        Last edited by capkid; 08-06-2013, 11:51 AM.
        LG Plasma Mal-Discharge Correction Service

        Comment

        • withalligators
          Badcaps Veteran
          • Jun 2013
          • 267
          • USA

          #5
          Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

          OK guys, I brought it home. When you first plug it in, the relay clicks and it turns itself on, and a quick Samsung Smart TV logo appears for less then a second and then it shuts off. A few seconds later the relay clicks again and the screen flashes on and then off instantly, with no logo. The top of the screen is also brighter than the bottom as if that edge is lighting but the bottom isn't. Pressing the power button does nothing. It will continue this cycle until you unplug it. At which point the relay will click on and off a few more times, but at a progressively slower rate. Any new ideas? I'm still thinking main but wouldn't be surprised if it were a component on the power board. would photos of any of these boards help?
          Cheers,
          Alex
          Last edited by withalligators; 08-08-2013, 12:12 PM.

          Comment

          • capkid
            Badcaps Legend
            • Oct 2010
            • 1339
            • United States

            #6
            Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

            Yes, clear pics of the circuit board layout and what you see onscreen would be helpful.
            LG Plasma Mal-Discharge Correction Service

            Comment

            • johnboy1313
              Badcaps Legend
              • Nov 2012
              • 1959
              • USA

              #7
              Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

              Originally posted by withalligators
              The top of the screen is also brighter than the bottom as if that edge is lighting but the bottom isn't.
              Originally posted by tom66
              Could be shorted LED strip too.
              This is where I would start. Try unplugging the LED strips one at a time to see if it will stay on. If it shuts off, plug that one back in and unplug the next one.

              Comment

              • withalligators
                Badcaps Veteran
                • Jun 2013
                • 267
                • USA

                #8
                Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                The whole shebang:

                The main:

                The power board:

                TCON:

                Comment

                • withalligators
                  Badcaps Veteran
                  • Jun 2013
                  • 267
                  • USA

                  #9
                  Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                  How does one get at the LED strips? When the logo appears, it seems uniform. It's every flash after that where the backlighting seems uneven. Also, while the red LED seems to just turn off and on inverse to whether the screen is off or on, it blinks twice after each relay click after you unplug it.

                  Comment

                  • aaronwt6
                    Badcaps Veteran
                    • Apr 2013
                    • 855
                    • US

                    #10
                    Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                    It apprears to me that there are tow cables at the top of the power supply going to the LED strips. I'd start by powering the set up with one then the other unplugged (ones at a time). If it powers up with either or unplugged then its going to be the LEDs.

                    Comment

                    • withalligators
                      Badcaps Veteran
                      • Jun 2013
                      • 267
                      • USA

                      #11
                      Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                      I tried that, the relay clicked, but it wouldn't turn on with either unplugged

                      Comment

                      • withalligators
                        Badcaps Veteran
                        • Jun 2013
                        • 267
                        • USA

                        #12
                        Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                        Yoicks, I can't find replacement main board for this anywhere except TVserviceparts, where they want 175. Anyone have any leads? It's p/n BN94-04359V. Shopjimmy lists these as substitute parts:
                        BN94-04357J
                        BN94-04359U
                        BN94-05038U
                        BN94-04359W
                        BN94-05038N
                        BN94-05038R
                        BN94-05038Y

                        Comment

                        • withalligators
                          Badcaps Veteran
                          • Jun 2013
                          • 267
                          • USA

                          #13
                          Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                          Ok, I'm putting this on the backburner until I get a notification from ebay that one of these boards has become available. If it works, I'll update so there is a thread out there in case someone else encounters the same problem. If it doesn't, I'll go the TCON route.

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #14
                            Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                            You can also set a notifier up with ShopJimmy.
                            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

                            • capkid
                              Badcaps Legend
                              • Oct 2010
                              • 1339
                              • United States

                              #15
                              Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                              I also like to get main boards from Tristate Module, since they offer a 6-month warranty. I almost had to return a main board before I figured out that an obscure firmware update was necessary along with the main board replacement, and Tristate didn't hesitate to take back the board when I called them. So, I'd keep an eye out for an available board on their site.
                              Last edited by capkid; 08-14-2013, 11:16 AM.
                              LG Plasma Mal-Discharge Correction Service

                              Comment

                              • withalligators
                                Badcaps Veteran
                                • Jun 2013
                                • 267
                                • USA

                                #16
                                Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                                Found a main for 80, disappointingly didn't do the trick. I looked more closely at the screen as it turned on and off, and the bottom edge LED lights may not be turning on. Is there a way to test this better?

                                Next time I go home, I'll take video in a dark room.

                                Comment

                                • withalligators
                                  Badcaps Veteran
                                  • Jun 2013
                                  • 267
                                  • USA

                                  #17
                                  Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                                  Yeah, the bottom 1/4 or so of the screen is dark. It's *really* hard to tell in this video, but here it is:
                                  http://s294.photobucket.com/user/wit...07841.mp4.html
                                  Is there any way to test the pins to see if its actually the LED before I open up the panel?
                                  Thanks,
                                  Alex

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #18
                                    Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                                    Any way you can get a full lit screen, maybe full white?
                                    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

                                    • freakaftr8
                                      Badcaps Legend
                                      • Oct 2012
                                      • 3743
                                      • USA

                                      #19
                                      Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                                      You cannot ohm an led strip. I'm learning about this more and more. The led tv incorporates a "balancer" to judge if the led strips are working optimal or not. What you need.ro do is get the service manual and find what voltages are on the balancer pins and led controller ic but im betting in you having some internal led error.
                                      Did I leave the soldering iron on?

                                      Comment

                                      • RJARRRPCGP
                                        Badcaps Legend
                                        • Jul 2004
                                        • 6301
                                        • USA

                                        #20
                                        Re: Samsung UN55D6450 turns itself off and on endlessly, no blinks

                                        It may be a primary issue.
                                        ASRock B550 PG Velocita

                                        Ryzen 9 "Vermeer" 5900X

                                        32 GB G.Skill RipJaws V F4-3200C16D-32GVR

                                        Arc A770 16 GB

                                        eVGA Supernova G3 750W

                                        Western Digital Black SN850 1TB NVMe SSD

                                        Alienware AW3423DWF OLED




                                        "Β‘Me encanta "Me Encanta o Enlistarlo con Hilary Farr!" -MΓ­ mismo

                                        "There's nothing more unattractive than a chick smoking a cigarette" -Topcat

                                        "Today's lesson in pissivity comes in the form of a ziplock baggie full of GPU extension brackets & hardware that for the last ~3 years have been on my bench, always in my way, getting moved around constantly....and yesterday I found myself in need of them....and the bastards are now nowhere to be found! Motherfracker!!" -Topcat

                                        "did I see a chair fly? I think I did! Time for popcorn!" -ratdude747

                                        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...