Typical current for LED backlight

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  • paulstef
    Badcaps Veteran
    • Dec 2013
    • 724
    • Canada

    #1

    Typical current for LED backlight

    I was wondering what the typical LED backlight current is.

    Has anybody measured it?

    I have a 32" RCA TV where it was designed to run at 350mA.
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Typical current for LED backlight

    I've seen 50mA for a smaller 22" Samsung LED backlit set. It varies entirely based on the set...
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

    • paulstef
      Badcaps Veteran
      • Dec 2013
      • 724
      • Canada

      #3
      Re: Typical current for LED backlight

      Thanks Tom.

      350mA seems a lot. I will lower it and observe if it's still bright enough.

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Typical current for LED backlight

        https://www.badcaps.net/forum/showpo...4&postcount=95
        42"
        Last edited by budm; 01-21-2015, 03:20 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

        • paulstef
          Badcaps Veteran
          • Dec 2013
          • 724
          • Canada

          #5
          Re: Typical current for LED backlight

          Thanks. I lowered it from 350mA to just above 100mA and can't see a difference. No idea why they drive them so hard.

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: Typical current for LED backlight

            Max brightness. Human visual perception is logarithmic. Doubling current approx doubles luminous flux. But you need almost 10x as much flux to perceive double the light.
            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

            • paulstef
              Badcaps Veteran
              • Dec 2013
              • 724
              • Canada

              #7
              Re: Typical current for LED backlight

              Ok, thanks guys!

              Comment

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