Un55mu630df

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

    #21
    Re: Un55mu630df

    Originally posted by fcisolutions
    Yes if I unplug the main board from PSU backlights come on and stay on.
    This proves your PSU is good. I however, don't think it is a Main Bd. but think the issue is a missing or low Vcom voltage on the T-CON Bd.

    Comment

    • nomoresonys
      Badcaps Legend
      • Jan 2013
      • 12075
      • U.S.

      #22
      Re: Un55mu630df

      Researched and found out it still can be powersupply, I didn't just pull that statement out of the air.

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #23
        Re: Un55mu630df

        Originally posted by fcisolutions
        Hello I have a Samsung UN55MU630DF television. I have tested the power supply and getting good reading on my voltages. 12.2 and 3.34. I replaced the main board because initially it would not even come on. Now the back lights flash on and off in a cycle. No T-Con but did replace ribbons from main to panel.
        The old board in place. What Voltage do you get on the power supply connector that goes to the main 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

        • fcisolutions
          Badcaps Veteran
          • Jan 2017
          • 205
          • United States

          #24
          Re: Un55mu630df

          Not sure what you mean by control voltages. The voltages going into the main board are all stable when everything is hooked up and the backlights are constantly cycling, at 12.7 volts. On the power supply pin 4 which is BO on/off will go from 0 up to 3.4 as the t.v. cycles.

          Comment

          • nomoresonys
            Badcaps Legend
            • Jan 2013
            • 12075
            • U.S.

            #25
            Re: Un55mu630df

            Check voltage of CP810S and CP814S, on powersupply, put meter leads on the legs, measure in standby and with power button activated, simple test.
            Last edited by nomoresonys; 05-10-2018, 04:33 PM.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #26
              Re: Un55mu630df

              Control signals:
              Pin 2: ANA_DIM (Analog Dimming control)
              Pin 4: OD_ON/OFF (BL-ON: Backlights on/off)
              Pin 6: BLU_PWM (PWM Dimming control)
              Pin 8: PS-ON (Main power supply ON/OFF)

              So which one is not stable? Pin 4?
              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

              • fcisolutions
                Badcaps Veteran
                • Jan 2017
                • 205
                • United States

                #27
                Re: Un55mu630df

                O.K. so I can't really put the t.v. in standbye because it seems to cycle on and off or at least the backlights flash on and then off. The capacitors on PC810S and CP814S top out at 391V. The control signals are
                Pin 4 stable @ 3.4V
                Pin 6 goes 1.1V to 0V
                Pin 8 goes 3.4V to 0V

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #28
                  Re: Un55mu630df

                  OK, so your main board is toggling PS-ON ON and off so the power supply is then toggling on and off which will cause the backlights to flash.
                  So how about request on post 23?
                  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

                  • fcisolutions
                    Badcaps Veteran
                    • Jan 2017
                    • 205
                    • United States

                    #29
                    Re: Un55mu630df

                    When I hook up the old main board the only voltages I get are on pins 3,5,7, and 9 at 12.7 V. No backlights come on. Standby is 12.7 also.

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #30
                      Re: Un55mu630df

                      So none of the control signals are there at all.
                      Where did you get the replacement board from?
                      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

                      • fcisolutions
                        Badcaps Veteran
                        • Jan 2017
                        • 205
                        • United States

                        #31
                        Re: Un55mu630df

                        Replacement board I got on ebay, it does have a return. But yes on the original board no other readings.

                        Comment

                        • CapLeaker
                          Leaking Member
                          • Dec 2014
                          • 7971
                          • Canada

                          #32
                          Re: Un55mu630df

                          You must have gotten a bad replacement main board. Ebay stuff is always a gamble.

                          Comment

                          • nomoresonys
                            Badcaps Legend
                            • Jan 2013
                            • 12075
                            • U.S.

                            #33
                            Re: Un55mu630df

                            Wonder if its a bad IC on the mainboard, did you locate a service manual?

                            Comment

                            • nomoresonys
                              Badcaps Legend
                              • Jan 2013
                              • 12075
                              • U.S.

                              #34
                              Re: Un55mu630df

                              While I had two mainboards to look at, I would test everything you can like the voltage regulator ICs fuses etc, on both of them, see if you have any differences in readings.

                              Comment

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