Samsung UN55C6300SFXZA blowing fuses

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  • EGreen
    Member
    • Dec 2014
    • 33
    • United States

    #1

    Samsung UN55C6300SFXZA blowing fuses

    Hello, I have a sumsung UN55C6300SFXZA with a BN44-00358B/PD55AF1U ZHS
    Power supply board. The guy I got it from said it just went out one day. When I opened it up I found the ceramic cap in location CP808 had been replaced with a RR 221K 1KV 3D . The original was R 221K 1KV. I don't know if this makes a difference. Looks as if the original one exploded due to the burn spot and smoke residue. The fuses were blown, I replaced them, Unplugged all connectors, powered up 120v ,fuses held, no power at the rectifier,plugged in connector to main board, fuse blew.I'm going to get some more fuses today.When I get back I'll use my limited skills to check some more components.
    What would I look for next?
    I have a mid grade DMM with capacitance testing and I orderd this "Small 12864 LCD Transistor Tester Capacitance ESR Meter Diode Triode MOS LCR NPN (251518131978)" .Don't know if it will work by it's worth a try

    I am not well educated in electronics , Can someone point me in the right direction to learn how to trouble shoot and repair these type of boards?
    I paid for an online site to learn but all I got was links to more paid sites.
    Is there a good source for training on how to troubleshoot and repair these TVs?
    I want to learn about the different sections of these board and how to test/repair them.
    Attached Files
  • EGreen
    Member
    • Dec 2014
    • 33
    • United States

    #2
    Re: Samsung UN55C6300SFXZA blowing fuses

    These are from Shop Jimmy
    Attached Files

    Comment

    • EGreen
      Member
      • Dec 2014
      • 33
      • United States

      #3
      Re: Samsung UN55C6300SFXZA blowing fuses

      I have 5.2 vdc on pin 16 CNM801. When I jumper to pin 18 pwr on/off both fuses blow immediately.

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Samsung UN55C6300SFXZA blowing fuses

        There are 4 fuses on the board, which are the two that blown? The main AC fuses?
        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

        • EGreen
          Member
          • Dec 2014
          • 33
          • United States

          #5
          Re: Samsung UN55C6300SFXZA blowing fuses

          Yes ,the other 2 are good

          Comment

          • freakaftr8
            Badcaps Legend
            • Oct 2012
            • 3743
            • USA

            #6
            Re: Samsung UN55C6300SFXZA blowing fuses

            odd I would look for shorted MOSFETs and me 12 volt and other output voltage circuit in the secondary side of the power supply to start.
            Did I leave the soldering iron on?

            Comment

            • EGreen
              Member
              • Dec 2014
              • 33
              • United States

              #7
              Re: Samsung UN55C6300SFXZA blowing fuses

              Thanks, I'll Check them out of circuit tomorrow.

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: Samsung UN55C6300SFXZA blowing fuses

                So both 5A main fuse is blown when PS_ON command is inserted.
                That is an active shorts, not static shorts, so we need to find out if there are parts that is now damaged.
                You should check the RESISTANCE on the Source and Drain of the power MOSFETs
                QP801, 802 in the PFC Voltage booster circuits, that cap CP808 is the snubber cap for the Diode DP802, 809.
                QM801, 802 for the VDRIVE SMPS power supply for the LED backlights circuit.
                You will need to look up the info on the MOSFET, look up the spec sheet of the P/N of the MOSFETs to get the pinout.
                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

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Samsung UN55C6300SFXZA blowing fuses

                  You should build one of this BOX which basically put the 120V lamp in series with the load (the TV or what ever you are working on) to automatically limit the current if there is shorts circuits so you do not keep blowing the fuses and parts.
                  You should also use the GFCI outlet to protect yourself.
                  http://s807.photobucket.com/user/bud...in=true&page=1

                  http://s807.photobucket.com/user/bud...tml?sort=3&o=7
                  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

                  • EGreen
                    Member
                    • Dec 2014
                    • 33
                    • United States

                    #10
                    Re: Samsung UN55C6300SFXZA blowing fuses

                    Thanks Budm ,Will do tomorrow...I am an electrician and have parts to build something similar to that.
                    Last edited by EGreen; 12-28-2014, 07:51 PM.

                    Comment

                    • EGreen
                      Member
                      • Dec 2014
                      • 33
                      • United States

                      #11
                      Re: Samsung UN55C6300SFXZA blowing fuses

                      I found a shorted mosfet
                      QP802
                      STF13NM60
                      I ordered 4 from arrow and some of the correct capacitors to replace the non-matching one that some stuck in there.
                      I also made a dim bulb tester like Budm suggested. The lamp is in line with the nuetral side of the duplex receptacle to prevent shock from the shell of the socket and the gfi is before the lamp so I can use it for full power.
                      Attached Files

                      Comment

                      • EGreen
                        Member
                        • Dec 2014
                        • 33
                        • United States

                        #12
                        Re: Samsung UN55C6300SFXZA blowing fuses

                        Update, Changed out shorted QP802 and and also 801 just in case. The TV powered up and works fine . The shorted QP802 apparently took out the replaced diode CP808 . Thanks for your help. One more thing, When I first powered it up there was green lines and patches all over the screen. I reset all the ribbon cables in the connectors on the T-Con board and that fixed it...E

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #13
                          Re: Samsung UN55C6300SFXZA blowing fuses

                          Well done and thanks for the follow-up on the repair.
                          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

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