FSC Amilo LI 3910 no backlight

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  • pdavid
    Badcaps Veteran
    • Jan 2011
    • 279
    • Hungary
    #1

    FSC Amilo LI 3910 no backlight

    I'd like some help in diagnosing this laptop here. The display gives picture but the backlight works only sometimes, mostly it doesn't. When it works the picture is clear and bright. I'm not sure if it's the ccfl, inverter or the mainboard that's faulty. The machine is 4 years old and it's actually rarely used.
    Measuring the inverter's input cord shows 10.6-11.2V 2.5V 3V GND. Interestingly there is a clean 12V supply voltage form the motherboard. Checking the wires continuity shows that the flat wire that comes from the motherboard and the other that goes to the inverter are not connected (no resistance measured).
    I have some experience with laptop displays and it would be really embarassing to get the wrong replacement part for this one.
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    • spidey
      climbs
      • Dec 2012
      • 644
      • Cyprus
      #2
      Re: FSC Amilo LI 3910 no backlight

      Measured voltages looks ok. Try known good inverter and a screen to find which is faulty. Probably, problem is ccfl. it is bad or, corrupted cable soldering.

        Comment

        • pdavid
          Badcaps Veteran
          • Jan 2011
          • 279
          • Hungary
          #3
          Re: FSC Amilo LI 3910 no backlight

          If the ccfls are faulty then I'll just pass. Those are built into the display panell and cannot be swapped. l'll get some working ccfl and test the inverter to see what happens.

            Comment

            • ben7
              Capaholic
              • Jan 2011
              • 4059
              • USA
              #4
              Re: FSC Amilo LI 3910 no backlight

              Originally posted by pdavid
              If the ccfls are faulty then I'll just pass. Those are built into the display panell and cannot be swapped. l'll get some working ccfl and test the inverter to see what happens.
              Are you sure you cant take the panel apart to replace the ccfl lamps?
              Muh-soggy-knee

                Comment

                • pdavid
                  Badcaps Veteran
                  • Jan 2011
                  • 279
                  • Hungary
                  #5
                  Re: FSC Amilo LI 3910 no backlight

                  Well, as I see the frame assembly is welded together and filled with some hard glue or resin around the ccfls. No screws, clips or anything.

                    Comment

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