Using Samsung Backlight as lighting

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  • bokkie
    Member
    • May 2013
    • 13
    • holland

    #1

    Using Samsung Backlight as lighting

    Got a Samsung UE49MU62220, powersupply = BN44-00807H
    The screen is broken, not the problem though.
    I want to use the unit for lighting.
    Without mainboard, so called "Forced Backlight" functions fine ... only ..it's full on.
    I would like to be able to dim the "unit"

    Unfortunately i can not find schematics/diagram of how the leds are driven, only some snippets here and there since it seems somewhat same for several designs from Samsung.

    BLU_PWM on CNM803 from the mainboard seems to be the signal that does this ..but how ?
    0.9 - 3.3V(full) should change the level. Could i just get a voltage from the powersupply and run it through a potentiometer or is it some special frequency requirement ?
    There is also vr9051, could i abuse this or is it only to limit max. current ?
  • yokoono
    Badcaps Veteran
    • Apr 2010
    • 475

    #2
    Re: Using Samsung Backlight as lighting

    If the power supply has a pin called a DIM, the backlight adjustment is done there.
    It may be called something else. With a positive voltage of about 3V the baclight is maximum. With voltage 0 (ground) it is minimal
    Last edited by yokoono; 04-14-2022, 11:31 AM.

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    • bokkie
      Member
      • May 2013
      • 13
      • holland

      #3
      Re: Using Samsung Backlight as lighting

      Well, since i can´t find a diagram or schematics ...

      There might be a pin ANA-DIM

      edit- attached picture is from a different model, pinout does not match mine, i get 13v on pin 2,3,4,5 pin6=0.4-0.5v only 11 and 12 seem to be ground, rest gives 3.2 3.3 and 5
      Attached Files
      Last edited by bokkie; 04-14-2022, 01:54 PM.

      Comment

      • bokkie
        Member
        • May 2013
        • 13
        • holland

        #4
        Re: Using Samsung Backlight as lighting

        man, need new eyes
        pinout is on the pcb of course
        but not helping much of course

        i get 3.2v out of ana-dim and 3.1 pwm-blu

        so, if these are outputted from the powersupply TO the mainboard ..yet the mainboard regulates the brightness through software ?! but the header for the backlight is on the powersupply ?!

        short pwm_blu or ana_dim to ground (through potentiometer) or what ?
        i don´t understand how it regulates the current here

        Comment

        • Biruslapio
          Badcaps Veteran
          • Nov 2013
          • 552
          • Brasil

          #5
          Re: Using Samsung Backlight as lighting

          The PSU is generating these voltages as part of the self-test that samsung has, if you wire the PSU manually, simulating a motherboard, then you will need to input voltages into PWM and DIM pins, 1~3V is the variable range for brightness, DC should be fine.

          Comment

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