Samsung LN52A630M1FXZC that does not have standby light and will not power on

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  • pjcanuck
    New Member
    • Dec 2019
    • 5
    • Canada
    #1

    Samsung LN52A630M1FXZC that does not have standby light and will not power on

    I have a Samsung LN52A630M1FXZC that does not have standby light and will not power on. This uses the BN44-00201A power supply board.
    I ordered the repair kit for this board from ShopJimmy and installed the following.
    QP801, QP802, DP802, ICM801, CM851, CM852, CM854, CM855, CM856, CM858.
    FS801, FI801 tested good.
    When I applied power the TV came to life and all was good for about 5 minutes.
    Then there was a loud snap and it went off.
    No burning smell, but under close inspection I found CM814 (470pf 1KV) to be split open, and FI801 to be blown.
    I have power to the rectifier, but no voltage to CN801. My electronics skills are limited.
    Any ideas on a path forward?
    Attached Files
    Tags: None
    • nomoresonys
      Badcaps Legend
      • Jan 2013
      • 12268
      • U.S.
      #2
      Re: Samsung LN52A630M1FXZC that does not have standby light and will not power on

      You are sure you didn't get any parts in backwards?

        Comment

        • pjcanuck
          New Member
          • Dec 2019
          • 5
          • Canada
          #3
          Re: Samsung LN52A630M1FXZC that does not have standby light and will not power on

          I've checked several times and verified that I installed the components the same way the original parts were installed. The banding side of capacitors lines up with the marks on the circuit board.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: Samsung LN52A630M1FXZC that does not have standby light and will not power on

              CM814 (470pF) is the snubber cap (these cap will shorted out when they go bad, it is commonly failed cap, it should be replaced with 2KV rating instead) for the MOSFET QM803 so you need to check the resistance of the Source resistor RM834 to see if it is blown open circuit or not, it should be <1 Ohm.
              See schematic attached.
              Attached Files
              Last edited by budm; 12-04-2019, 02:26 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

                • pjcanuck
                  New Member
                  • Dec 2019
                  • 5
                  • Canada
                  #5
                  Re: Samsung LN52A630M1FXZC that does not have standby light and will not power on

                  I checked the in circuit resistance of RM834 and it is approx 0.5 ohm.

                    Comment

                    • pjcanuck
                      New Member
                      • Dec 2019
                      • 5
                      • Canada
                      #6
                      Re: Samsung LN52A630M1FXZC that does not have standby light and will not power on

                      I checked the in circuit resistance of RM834 and it is approx 0.5 ohm.

                        Comment

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