ASUS X555LD no backlight

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  • Anethra
    Senior Member
    • Dec 2018
    • 70
    • Turkey

    #1

    ASUS X555LD no backlight

    hello

    motherboard not open to backlight. So, i checked to motherboard and see anx1121 epxlode and 26. pin is damaged. changed ic and fixed road. but still same problem. i tryed to panel another pc, working fine. can you give me an idea of what i should do?

    and motherboard is x555ld rev 3.1
    Attached Files
  • mcplslg123
    Badcaps Legend
    • Jun 2015
    • 7262
    • india

    #2
    Re: ASUS X555LD no backlight

    You need to measure voltage at Screen connector.

    Comment

    • Anethra
      Senior Member
      • Dec 2018
      • 70
      • Turkey

      #3
      Re: ASUS X555LD no backlight

      19v and 3.3v comes to panel if you want to learn this. 0 panel and 0 cable doesnt any change.

      Comment

      • mcplslg123
        Badcaps Legend
        • Jun 2015
        • 7262
        • india

        #4
        Re: ASUS X555LD no backlight

        Originally posted by Anethra
        19v and 3.3v comes to panel if you want to learn this. 0 panel and 0 cable doesnt any change.
        This makes no sense in diagnosing a fault. You need to measure specific pins which are responsible for lcd backlit like, BKLON, LCDVDD,BKLEN etc.

        Comment

        • Anethra
          Senior Member
          • Dec 2018
          • 70
          • Turkey

          #5
          Re: ASUS X555LD no backlight

          k. i check to connectors vled=19v, blenable=2.8 and blpwm=0v. I followed the path and its going to 26th pin (damaged) on ic. I repaired the path but I can't get any measurements from ic when I check directly and it was new ic. So is my ic broken?

          Comment

          • mcplslg123
            Badcaps Legend
            • Jun 2015
            • 7262
            • india

            #6
            Re: ASUS X555LD no backlight

            ANX1121 may be badly soldered or bad. Btw, I hate this ic as most of the ic sold as new are bad. I myself faced this on another asus. Could be for faulty PCH as well.

            Comment

            • Anethra
              Senior Member
              • Dec 2018
              • 70
              • Turkey

              #7
              Re: ASUS X555LD no backlight

              i can just replace it and it works normally now. ty for help mcplslg123

              Comment

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