Samsung UN40D6000SFXZA LED-No Power-No Standby-Power Supply Issue

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  • ALR
    Senior Member
    • Nov 2012
    • 111
    • United States
    #1

    Samsung UN40D6000SFXZA LED-No Power-No Standby-Power Supply Issue

    I have another unit that suffered from a lightning strike as well.

    BN44-0423A No Standby/No OUT voltage/No Power

    SMPS seems to be the culprit. I can purchase another board but would like to try and see if I can get this one going without replacing entire board.

    I've checked the Fuses(Ok), Rectifier(Ok) and Transistors(Ok) and have 120VAC coming in. Tested with CNL802 plugged in only to see if the LED display would light up but no go so I assume it's a SMPS issue.

    Everything looks good on it, no visible damage except for resistor RP806, I've attached a pic. Looks like it's bulged out on the ends, more so compared to the other ones on the board.

    I found a good quality picture of the bottom side and top side.

    http://www.shopjimmy.com/media/catal...423a-top_1.jpg

    http://assets.shopjimmy.com/media/ca...23a-bottom.jpg
    Attached Files
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Samsung UN40D6000SFXZA LED-No Power-No Standby-Power Supply Issue

      OK, second round!
      Just the board by itself and power applied, what DC voltage do you get at that 100uF 450VDC cap, measured right at the two legs? It should have about 160~170VDC.
      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

        • ALR
          Senior Member
          • Nov 2012
          • 111
          • United States
          #3
          Re: Samsung UN40D6000SFXZA LED-No Power-No Standby-Power Supply Issue

          Shows good at 170VDC.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: Samsung UN40D6000SFXZA LED-No Power-No Standby-Power Supply Issue

              Any DC voltages on CNM803/A PINS? Use capacitor CS855 Negative legs as for your meter black ground ref. One of those pin should have 5VDC on it.
              If the CNM803 as shown in SJ picture matches your board exactly, then you have CNM803A (16 PINS instead of 14 pins for CNM803).
              Last edited by budm; 03-20-2014, 11:45 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

                • ALR
                  Senior Member
                  • Nov 2012
                  • 111
                  • United States
                  #5
                  Re: Samsung UN40D6000SFXZA LED-No Power-No Standby-Power Supply Issue

                  No 5VDC on either pins.

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA
                      #6
                      Re: Samsung UN40D6000SFXZA LED-No Power-No Standby-Power Supply Issue

                      How about all the other pins? nothing? all dead?
                      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
                          #7
                          Re: Samsung UN40D6000SFXZA LED-No Power-No Standby-Power Supply Issue

                          BTW, fuse FP802S T2AL is OK?
                          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

                            • ALR
                              Senior Member
                              • Nov 2012
                              • 111
                              • United States
                              #8
                              Re: Samsung UN40D6000SFXZA LED-No Power-No Standby-Power Supply Issue

                              Didn't get anything on any of the 16 pins. Mostly started around 3 and dropped with - to 000

                              Yes, FP802S T2AL is beeping and the other fuse as well.
                              Last edited by ALR; 03-21-2014, 12:01 AM.

                                Comment

                                • ALR
                                  Senior Member
                                  • Nov 2012
                                  • 111
                                  • United States
                                  #9
                                  Re: Samsung UN40D6000SFXZA LED-No Power-No Standby-Power Supply Issue

                                  Any advice on what to check next? I put a bid on a board and won it for 35 but haven't paid for it yet. Wanted to try and do another test or two before paying for it today. Not really about the $, just want to learn. =)

                                    Comment

                                    • ALR
                                      Senior Member
                                      • Nov 2012
                                      • 111
                                      • United States
                                      #10
                                      Re: Samsung UN40D6000SFXZA LED-No Power-No Standby-Power Supply Issue

                                      Disregard. I just replaced it for $35. Thanks for the input Bud.

                                        Comment

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