aSUS k55vd no backlight

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  • jasko_jacker
    Badcaps Legend
    • Oct 2014
    • 1140
    • italy
    #1

    aSUS k55vd no backlight

    As you can see on the pic , LED_BKLTEN is managed by two bat54a diodes
    in common anode configuration.
    Backlight works only without LCD_BACKEN_PCH_IR signal, this line has 25 Ohm (with or without the 104 resistor array), 0.7 V and is connected direct to pch.
    If I remove the diode D4602 backlight go on (LED_BKLTEN get 3.3 v) and the pwm signal LED_BKLTCTL can change the brightness.
    pch issue ? but if I leave it all like this what could happen?
    Attached Files
    Last edited by SMDFlea; 10-19-2023, 07:09 AM.
    Tags: None
    • caspian
      Badcaps Legend
      • Oct 2015
      • 1591
      • Laptop
      #2
      Re: aSUS k55vd no backlight

      If D4602 is removed, I guess the followings may be possible:
      - Backlight gets on earlier than expected at startup.
      - Backlight stays on when the OS tries to turn the screen off after 20min of inactivity.

        Comment

        • jasko_jacker
          Badcaps Legend
          • Oct 2014
          • 1140
          • italy
          #3
          Re: aSUS k55vd no backlight

          Originally posted by caspian
          If D4602 is removed, I guess the followings may be possible:
          - Backlight gets on earlier than expected at startup.
          - Backlight stays on when the OS tries to turn the screen off after 20min of inactivity.
          Thanks

            Comment

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