Need help identifying this component on Samsung uhd8500

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  • dragunfury
    Member
    • Jul 2016
    • 14
    • Pakistan

    #1

    Need help identifying this component on Samsung uhd8500

    Hello everyone iam completely noob when it comes to circuit board and electronic parts. I need help my led is samsung uhd 8500 and its power supply board is bn44-0072a l55g4p ehs. My tv was on standby when i smelled burning smell coming from the tv. I opened tv and a part is burned on psu.

    I want to know the name of the part burned and is the board repairable?
    Attached Files
  • dick_barton
    Badcaps Legend
    • Aug 2015
    • 6642
    • Wales

    #2
    Re: Need help identifying this component on Samsung uhd8500

    I suspect that the transformer pin had a bad solder joint and has heated up and carbonised the circuit board. You need to scrape it all off (black carbon) as much as possible and then remake the connections using tinned copper wire. It looks like it is only the resistor which joins the transformer pin at that point. Also check the fuse alongside JP1032/JP1034 and the diodes closeby.
    Willing to help but I'm no expert.

    Comment

    • dragunfury
      Member
      • Jul 2016
      • 14
      • Pakistan

      #3
      Re: Need help identifying this component on Samsung uhd8500

      Thanks for the reply. how i remove carbon from the burnt point and is the component ok or it also have been burned and can you tell me the transformer name also.

      Comment

      • dick_barton
        Badcaps Legend
        • Aug 2015
        • 6642
        • Wales

        #4
        Re: Need help identifying this component on Samsung uhd8500

        The name of the transformer is the name printed on top of it as shown in the picture. To remove the carbon you need to scrape it off using a sharp instrument.

        Edit
        Do you have a meter (DMM) and can you use it?
        Last edited by dick_barton; 07-10-2016, 04:33 PM.
        Willing to help but I'm no expert.

        Comment

        • dragunfury
          Member
          • Jul 2016
          • 14
          • Pakistan

          #5
          Re: Need help identifying this component on Samsung uhd8500

          Yes i have a multi meter and can you plz tell me what are diodes?
          My brother can use meter.
          Last edited by dragunfury; 07-10-2016, 04:18 PM.

          Comment

          • dick_barton
            Badcaps Legend
            • Aug 2015
            • 6642
            • Wales

            #6
            Re: Need help identifying this component on Samsung uhd8500

            With the set disconnected:-

            1. Set your meter to diode mode.
            Place you meter probes across DS801 at point X and Y and record the reading shown on the meter.
            Reverse the meter probes across DS801 and record the readings

            2. Repeat for DS802

            3. Set your meter to ohms
            Place meter probes across the resistor at point X and Y and note the reading

            4. Place the probes across the fuse FS80?? point X and Y and note the reading
            Attached Files
            Last edited by dick_barton; 07-10-2016, 04:32 PM.
            Willing to help but I'm no expert.

            Comment

            • dragunfury
              Member
              • Jul 2016
              • 14
              • Pakistan

              #7
              Re: Need help identifying this component on Samsung uhd8500

              I have this type of meter.
              How i put it to diode?
              Attached Files
              Last edited by dragunfury; 07-10-2016, 04:39 PM.

              Comment

              • dick_barton
                Badcaps Legend
                • Aug 2015
                • 6642
                • Wales

                #8
                Re: Need help identifying this component on Samsung uhd8500

                Meter is fine
                For the diode check then switch meter to diode
                For Ohms test to Ohms
                Attached Files
                Willing to help but I'm no expert.

                Comment

                • vinceroger69
                  Badcaps Legend
                  • Mar 2012
                  • 6714
                  • uk

                  #9
                  Re: Need help identifying this component on Samsung uhd8500

                  Originally posted by dragunfury
                  I have this type of meter.
                  How i put it to diode?
                  diode mode marked
                  Attached Files

                  Comment

                  • dragunfury
                    Member
                    • Jul 2016
                    • 14
                    • Pakistan

                    #10
                    Re: Need help identifying this component on Samsung uhd8500

                    1. Reading at Ds801= 455

                    2. Reading at Ds802= 453

                    3. Name of the resistor plz.

                    4. Reading at fuse= 0.01

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #11
                      Re: Need help identifying this component on Samsung uhd8500

                      You may be lucky that it was just due to poor soldering works on the transformer pins that use through hole rivets, so you need to scrape off all those carbon as sugested already and rewire the connection, then you need to resolder all the transformer pins, all the pin of the 3-pin devices mounted on the heatsink, you need to use good soldering iron (40W or more) and flux.
                      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

                      • dragunfury
                        Member
                        • Jul 2016
                        • 14
                        • Pakistan

                        #12
                        Re: Need help identifying this component on Samsung uhd8500

                        Next step plz. I tried my best to scrap the carbon.
                        Attached Files

                        Comment

                        • dick_barton
                          Badcaps Legend
                          • Aug 2015
                          • 6642
                          • Wales

                          #13
                          Re: Need help identifying this component on Samsung uhd8500

                          Use some alcohol and a stiff brush, eg toothbrush and clean up the area. I would remove ALL the carbon around the hole in th pcb and then make good by using the method I suggested earlier.
                          Did you do what Budm suggested and resolder all the joints??
                          Willing to help but I'm no expert.

                          Comment

                          • dragunfury
                            Member
                            • Jul 2016
                            • 14
                            • Pakistan

                            #14
                            Re: Need help identifying this component on Samsung uhd8500

                            I solder the points like this. Is this ok? I also ran the tv with this board for two hours no problems yet.
                            Attached Files

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #15
                              Re: Need help identifying this component on Samsung uhd8500

                              You need to cut out more of that black carbon off the board, we are dealing with almost 400VDC on that transformer pins.
                              Make sure to resolder all other transformer's legs and devices as suggested.
                              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

                              • SLK001
                                Badcaps Veteran
                                • May 2014
                                • 264
                                • USA

                                #16
                                Re: Need help identifying this component on Samsung uhd8500

                                The new "hole" appears to be on the low voltage side of the transformer. However, remember that carbon is conductive, so do as budm suggests and remove more of the black stuff, especially near that outside trace.

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #17
                                  Re: Need help identifying this component on Samsung uhd8500

                                  Originally posted by SLK001
                                  The new "hole" appears to be on the low voltage side of the transformer. However, remember that carbon is conductive, so do as budm suggests and remove more of the black stuff, especially near that outside trace.
                                  That pin is on the hot side, as you can see, that pin is for the primary drive winding pin connected to the fuse and the other end of the fuse is connected to the main filter cap + leg, the other pin of the primary drive is connected to a small inductor, and the jumper that goes to pin 5~8 of the SMPS ICS801.
                                  The cold side only has two pins.
                                  https://www.badcaps.net/forum/attach...8&d=1468228360
                                  EXACTO knife is good for cutting out the burnt section.
                                  Last edited by budm; 07-11-2016, 10:51 PM.
                                  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

                                  • SLK001
                                    Badcaps Veteran
                                    • May 2014
                                    • 264
                                    • USA

                                    #18
                                    Re: Need help identifying this component on Samsung uhd8500

                                    Originally posted by budm
                                    That pin is on the hot side, as you can see...
                                    You're right. I see it now looking at the micro-picture of the entire power supply board. Hence the need for good, high resolution pictures.

                                    Comment

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