Samsung blinking red light / wont turn on

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  • echodreamz
    Member
    • Jul 2014
    • 20
    • USA

    #1

    Samsung blinking red light / wont turn on

    I have a ln46a630m1fxza TV, it worked great until a few weeks ago, the picture would fade behind some colored dots / lines (looked like a TCON failure). Now it has stopped powering up all together, simply a blinking red standby light and every 10 seconds or so the relay cycles itself and the process endlessly repeats.

    All the caps look brand new on the PSU, only thing I can think is that the mainboard has failed? I checked all the outputs of the PSU (minus the inverter ones) and they all match what the layout states the output should be.

    Should I go for the mainboard replace?
  • sordids999
    Badcaps Legend
    • May 2013
    • 2149
    • uk

    #2
    Re: Samsung blinking red light / wont turn on

    Pictures of the back of the tv showing parts will help you more with fixing your problem

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Samsung blinking red light / wont turn on

      https://www.badcaps.net/forum/showthread.php?t=39740
      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

      • echodreamz
        Member
        • Jul 2014
        • 20
        • USA

        #4
        Re: Samsung ln46a630m1fxza blinking red light / wont turn on

        My apologies, I've attached them to this post.

        Thank you!
        Attached Files
        Last edited by echodreamz; 10-26-2014, 03:03 PM.

        Comment

        • echodreamz
          Member
          • Jul 2014
          • 20
          • USA

          #5
          Re: Samsung blinking red light / wont turn on

          I've also pulled all the cables off the mainboard with the exception of the 2 coming from the PSU. The issue still exists with the stby light blinking.

          Comment

          • echodreamz
            Member
            • Jul 2014
            • 20
            • USA

            #6
            Re: Samsung blinking red light / wont turn on

            For whatever reason now, the unit powers up, the backlights kick on, the unit runs for 20 seconds or so and then it turns off and cycles itself all over again.

            I get snow / whitenoise for a few seconds then the screen shows colored lines as shown in the picture for a few seconds then powers off.

            I've pulled the cable from the mainboard and the LCD controller and I also tried just pulling the 2 cables going from the LCD controller to the TCON. The results are the same, unit powers up, backlights fire up, few seconds later it restarts itself.

            Could be a failing mainboard? I would think that if the TCON was bad the picture would be bad constantly, not OK for a brief few seconds.

            EDIT: After leaving it off for a few minutes, the backlights no longer come on, however, I've been able to repeat this process 3 times now, so it cannot be fluke. If I hold my multimeter on pin 13 (5v) and GND until the relay clicks, the backlights will then come on a few seconds later, however the unit still power cycles itself.
            Attached Files
            Last edited by echodreamz; 10-27-2014, 12:34 AM.

            Comment

            • Amraks
              Badcaps Veteran
              • Nov 2011
              • 725
              • Australia

              #7
              Re: Samsung blinking red light / wont turn on

              done any solder joint checks?

              Comment

              • echodreamz
                Member
                • Jul 2014
                • 20
                • USA

                #8
                Re: Samsung blinking red light / wont turn on

                I have not, no. Is this common?

                Comment

                • Andrew F. Ali
                  Badcaps Legend
                  • Jan 2014
                  • 2450
                  • Trinidad & Tobago

                  #9
                  Re: Samsung blinking red light / wont turn on

                  I had a similar problem with another Samsung UN46EH5300. On the top right corner of the 2nd pic, the four (4) caps in a row next to the heat sink replace those first then if that doesn't work disconnect the Wi-Fi emitter from th Main Bd.

                  Comment

                  • echodreamz
                    Member
                    • Jul 2014
                    • 20
                    • USA

                    #10
                    Re: Samsung blinking red light / wont turn on

                    I've already tried unplugging everything from the mainboard (minus power) and the unit still does the cycling. The caps though look brand new (I know that is not a good indicator). There are no caps anywhere that even show the tiniest hint of being bad.

                    However I will replace them as it is a cheap deal.

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #11
                      Re: Samsung blinking red light / wont turn on

                      At this I believe you have bad main board.
                      See pdf for the power supply SCH.
                      Attached Files
                      Last edited by budm; 10-27-2014, 10:52 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

                      • echodreamz
                        Member
                        • Jul 2014
                        • 20
                        • USA

                        #12
                        Re: Samsung blinking red light / wont turn on

                        That is what my gut was saying, but I just wanted to get a second opinion. I have one on order for pretty cheap, was a pain to find. I'll post back once I install it.

                        Comment

                        • Shinju
                          Badcaps Legend
                          • Mar 2014
                          • 1239
                          • USA

                          #13
                          Re: Samsung blinking red light / wont turn on

                          Another FRC/Logic board Sammy!

                          besides you unplugging the T-con and everything else, have you also unplugged the main from the PS to see if the backlights kick on after you plug the unit in?

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #14
                            Re: Samsung blinking red light / wont turn on

                            This BN44-00203 power supply board does not have built-in pull up resistors for the PS_ON or for the BL_ON so disconnecting the cables between the power SUPPLY and the main board will not force the power supply and the backlights to come 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

                            • Shinju
                              Badcaps Legend
                              • Mar 2014
                              • 1239
                              • USA

                              #15
                              Re: Samsung blinking red light / wont turn on

                              Originally posted by budm
                              This BN44-00203 power supply board does not have built-in pull up resistors for the PS_ON or for the BL_ON so disconnecting the cables between the power SUPPLY and the main board will not force the power supply and the backlights to come on.
                              Got it!

                              Thanks for the information Budm, So many Samsungs so little time!

                              Comment

                              • echodreamz
                                Member
                                • Jul 2014
                                • 20
                                • USA

                                #16
                                Re: Samsung blinking red light / wont turn on

                                Yeah, nothing happens when I pull the cables, the unit acts like it is not plugged in. Is there a way I can test? I tried shorting pin 1 on the 24 pin connector to GND but nothing happened. How would I test the PSU / backlights without the mainboard? I assume I will need resistors to short between terminals.

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #17
                                  Re: Samsung blinking red light / wont turn on

                                  You will need two 500~1K resistors, one will be between 5.1VSTBY and the PS_ON (Power ON/OFF) pin, another one will be between the BL_ON (Inverter ON/OFF) pin and 5.1VSTBY. Some may need another resistor between DIM and 5VSTBY.
                                  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

                                  • echodreamz
                                    Member
                                    • Jul 2014
                                    • 20
                                    • USA

                                    #18
                                    Re: Samsung blinking red light / wont turn on

                                    Well, I've seen the backlights fire up, so I know they work, the unit simply doesnt stay powered up, I guess due to the main board?

                                    Comment

                                    • Shinju
                                      Badcaps Legend
                                      • Mar 2014
                                      • 1239
                                      • USA

                                      #19
                                      Re: Samsung blinking red light / wont turn on

                                      Well I am just curious if maybe the shut down is the inverter board/transformer failing as well. I had a Samsung that worked great played the hell out of it for a week straight, one day I came in to play a movie on it as I was about to list it for sale and all it would do is blink the LED.

                                      I unplugged it and it could come back on for a bit and shut down. if I left it unplugged for a day or two it would come up and play for another week or so then fail again.

                                      After awhile I thought its got to be the PS but the PS was brand new not s refub but new direct from Samsung (person I got the panel from paid 239.99 from Sammy for it). Come to find out it was a defective transformer on the inverter causing all this ruckus!

                                      Mind you this is a newer panel that has the PS/Inverter combo board.

                                      I replaced all 3 with upgraded parts and its been working fine ever since!

                                      Comment

                                      • echodreamz
                                        Member
                                        • Jul 2014
                                        • 20
                                        • USA

                                        #20
                                        Re: Samsung blinking red light / wont turn on

                                        Which pin number is for the Inverter on/off? I see pin 1 for power on / off, however I do not see anything specific to the Inverter

                                        Comment

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