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Samsung UN43NU6950BXZA no sound, no picture nor backlight.

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    Samsung UN43NU6950BXZA no sound, no picture nor backlight.

    Disconnecting the cable that link the mainboard and power supply brings on the backlights. With PS and mainboard connected, when I press the power button the power_on/off 3.3V goes to power supply, The PS voltage goes up to 12.9V from 11.5V when that happens. Backlight does not come on. After about 10-15 seconds Power_on 3.3V drop to zero, power supply goes back into standby. I disconnect the panel same problem. The mainboard numbers are BN94-14106F
    BN94-14106F, BN97-15621C, BN41-02662A. Any suggestions, any service information?
    Attached Files

    #2
    Re: Samsung UN43NU6950BXZA no sound, no picture nor backlight.

    How about the control Voltages on pins 2, 4, and 6 when main board is connected and not connected?
    Seems to be main board issue since the power board self test 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


      #3
      Re: Samsung UN43NU6950BXZA no sound, no picture nor backlight.

      With PS disconnected from mainboard:
      Pin 2 =3.06V
      Pin 4 =0V
      Pin 6 =3.61V

      With PS and mainboard connected and TV in on state
      Pin 2 =0V
      Pin 4 =3.38V
      Pin 6 =0V

      Voltages were measured on PS connector. NB that pin 4 on the PS is NC (not connected) to the rest of the circuit.

      Comment


        #4
        Re: Samsung UN43NU6950BXZA no sound, no picture nor backlight.

        As Bud suggested, looking like a mainboard issue.
        Quit due to disrespect from unpaid sta,ff.

        Comment


          #5
          Re: Samsung UN43NU6950BXZA no sound, no picture nor backlight.

          A closer look at the PS above show that the STB should be 7.6V and the ON= 12.35V. I measured STB=11.5V and ON=12.9V. Are those normal or it because the PS is not under full load because the TV is not coming on 100%?

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