Samsung UN29EH4000 PS troubleshooting

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  • handsworth
    Senior Member
    • Oct 2015
    • 174
    • United States
    #1

    Samsung UN29EH4000 PS troubleshooting

    Hi guys, this is my first post but I've been here many times for information. So I bought this 29" Samsung on CL $10. Did all the preliminary stuff and found that the backlights wont come on. Remote works, have sound and can see the picture image using the flashlight test. Ah , good so far. So I disco'd the main board, and the backlights just flash once when plugged in. I gather its either the PS or the LEDS. So before I take this thing fully apart to test the leds, can someone tell me what voltages I should be getting at the LED connection on the PS. Attached is the PS top and bottom. Your help is greatly appreciated.

    Correction: UN29F4000
    Attached Files
    Last edited by handsworth; 03-09-2016, 07:01 PM. Reason: wrong model#
    Tags: None
    • CapLeaker
      Leaking Member
      • Dec 2014
      • 8005
      • Canada
      #2
      Re: Samsung UN29EH4000 PS troubleshooting

      More likely the LED's. What do you get on DCV on each string? Does it ramp up then off?

        Comment

        • ReeceyBurger123
          Never Give Up !
          • May 2014
          • 7325
          • Britain
          #3
          Re: Samsung UN29EH4000 PS troubleshooting

          Originally posted by capleaker
          more likely the led's. What do you get on dcv on each string? Does it ramp up then off?
          +100
          Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

          https://www.facebook.com/Telford-Tel...7894576335359/

            Comment

            • handsworth
              Senior Member
              • Oct 2015
              • 174
              • United States
              #4
              Re: Samsung UN29EH4000 PS troubleshooting

              If I'm doing it right, I only get +100 on pins -11 and +12. Reads 230V.

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA
                  #5
                  Re: Samsung UN29EH4000 PS troubleshooting

                  Per chart as printed on the power supply-LED driver board, the LED Voltage is 113V, so the Boost converter is working but your LED circuit has open circuit.
                  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

                    • handsworth
                      Senior Member
                      • Oct 2015
                      • 174
                      • United States
                      #6
                      Re: Samsung UN29EH4000 PS troubleshooting

                      Originally posted by budm
                      Per chart as printed on the power supply-LED driver board, the LED Voltage is 113V, so the Boost converter is working but your LED circuit has open circuit.
                      So is the open circuit on the PS board or in the led string of lights. Just so I know which one to tackle.

                        Comment

                        • ReeceyBurger123
                          Never Give Up !
                          • May 2014
                          • 7325
                          • Britain
                          #7
                          Re: Samsung UN29EH4000 PS troubleshooting

                          In the Led lights, so you will need to take the whole panel apart.
                          Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                          https://www.facebook.com/Telford-Tel...7894576335359/

                            Comment

                            • handsworth
                              Senior Member
                              • Oct 2015
                              • 174
                              • United States
                              #8
                              Re: Samsung UN29EH4000 PS troubleshooting

                              So I carefully took the panel apart and found one led had burned and came off one of the strips. I already ordered a new strip and hope this solves my problem. Will update in a few days. Thanks for the help.

                                Comment

                                • handsworth
                                  Senior Member
                                  • Oct 2015
                                  • 174
                                  • United States
                                  #9
                                  Re: Samsung UN29EH4000 PS troubleshooting

                                  I received my new LED strip today and that solved the problem. TV is good to go. Thanks for the advice and hopefully I can help someone else.

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA
                                      #10
                                      Re: Samsung UN29EH4000 PS troubleshooting

                                      Thanks for the follow-up.
                                      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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