A551L no signal and fickering

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  • ale211734
    New Member
    • Oct 2022
    • 4
    • Italy
    #1

    A551L no signal and fickering

    Hello everyone,
    I have a issue with asus A551L laptop.
    Lcd came black some time when I streaming a movie and the audio and backlight work. When lcd is black if I connect the laptop to external monitor I can see a correct image, it's work.
    Sometime after that screen became black, I can see a flickering white image.
    I captured a video showing the problem video
    Any idea?

    Thanks in advance.
    Attached Files
    Tags: None
    • mcplslg123
      Badcaps Legend
      • Jun 2015
      • 7262
      • india
      #2
      Re: A551L no signal and fickering

      It flickers only on battery power or flickers on both adapter/battery?? Measure LVDS/EDP connector pin voltages.

        Comment

        • ale211734
          New Member
          • Oct 2022
          • 4
          • Italy
          #3
          Re: A551L no signal and fickering

          Originally posted by mcplslg123
          It flickers only on battery power or flickers on both adapter/battery?? Measure LVDS/EDP connector pin voltages.
          Hello,
          thanks for reply,
          the problem is present with only the battery connected and when I connect the laptop with power supply. Today I connect it with power supply I get a only one black screen without flickering.

          Sorry I am a beginner, can you explain how check LVDS/EDP connector?
          Can you explain me how check the voltage on the connector. I just open the lcd. Should I check the voltage on pcb components connect to pins of lcd connector (red arrows in image attachment)? I don't know the pinout.
          Attached Files

            Comment

            • mcplslg123
              Badcaps Legend
              • Jun 2015
              • 7262
              • india
              #4
              Re: A551L no signal and fickering

              There is a coil marked 100 on led logic card. Replace it with same coil from any other bad screen . This is a common fault with asus. This should fix screen flickering on battery only.

              Lets fix this part first. Then we can proceed further.

              Btw, have you tried another known good screen?? Attach boardview file ,if available.

                Comment

                • ale211734
                  New Member
                  • Oct 2022
                  • 4
                  • Italy
                  #5
                  Re: A551L no signal and fickering

                  It has been several days since the last time the screen went black and flashed after I disassembled and removed the LCD cover and disconnected and reconnected the cable from the side of the screen several times. Could it be some contact on the cable?

                    Comment

                    • mcplslg123
                      Badcaps Legend
                      • Jun 2015
                      • 7262
                      • india
                      #6
                      Re: A551L no signal and fickering

                      Yes it can be.

                        Comment

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