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[SOLVED] 820-2796 - No Backlight

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  • [SOLVED] 820-2796 - No Backlight

    F8000:
    8.38V


    J9000:

    Pin 01 - 0.16V
    Pin 02 - 0
    Pin 03 - 0
    Pin 04 - 0
    Pin 05 - 0
    Pin 06 - 0.13V
    Pin 07 - 0.11V
    Pin 08 - 0.11V
    Pin 09 - 0.11V
    Pin 10 - 0.12V
    Pin 11 - 0.12V
    Pin 12 - 0
    Pin 13 - 0
    Pin 14 - 0
    Pin 15 - 0
    Pin 16 - 0
    Pin 17 - 0
    Pin 18 - 0
    Pin 19 - 0
    Pin 20 - 0
    Pin 21 - 0
    Pin 22 - 0
    Pin 23 - 0
    Pin 24 - 0
    Pin 25 - 0
    Pin 26 - 0
    Pin 27 - 0
    Pin 28 - 0
    Pin 29 - 0
    Pin 30 - 0.17V

    Q9807

    Pin 1 - GND
    Pin 2 - BKLT_PLT_RST_L - 0V
    Pin 3 - LCDBKLT_EN_L - - 8.03V
    Pin 4 - LCDBKLT_DISABLE - 0.20V
    Pin 5 - LCDBKLT_EN - 0V
    Pin 6 - LCDBKLT_DISABLE - 0.22

    Q9806:

    Pin 1 - PPBUS_SW_LCDBKLT_PWR - 0V
    Pin 2 - PPBUS_SW_LCDBKLT_PWR - 0V
    Pin 3 - LCDBKLT_EN_DIV - 8.14V
    Pin 4 - PPBUS_S0_LCDBKLT_FUSED - 8.38V
    Pin 5 - PPBUS_SW_LCDBKLT_PWR - 0V
    Pin 6 - PPBUS_SW_LCDBKLT_PWR - 0V

    R9808:
    300K

    R9809
    147K
    Last edited by menatwork; 05-06-2016, 03:30 PM.

  • #2
    There is no image either!? Does it even chime?

    Comment


    • #3
      No, i don't have nothing in the screen.

      Comment


      • #4
        Check SMC_LID and if that is ok then you first have to try a known good working LCD assembly.

        Comment


        • #5
          Duke, SMC_LID (3.41V) is ok and i try two different LCD assembly.
          Another advice?

          Comment


          • #6
            You need 5V coming through U9000, check if enable signal is there.

            Comment


            • menatwork
              menatwork commented
              Editing a comment
              U9000

              Pin 1 - LCD_IG_PWR_EN - 0v
              Pin 2 - PP3V3_S5 - 3.30V
              Pin 3 - PP3V3_S5 - 3.30v
              Pin 4 - PP3V3_SW_LCD_UF - 0V
              Pin 5 - PP3V3_SW_LCD_UF - 0V
              Pin 6 - GND

          • #7
            U9000

            Pin 1 - LCD_IG_PWR_EN - 0v
            Pin 2 - PP3V3_S5 - 3.30V
            Pin 3 - PP3V3_S5 - 3.30v
            Pin 4 - PP3V3_SW_LCD_UF - 0V
            Pin 5 - PP3V3_SW_LCD_UF - 0V
            Pin 6 - GND

            Comment


            • #8
              if this is not chiming you have a much bigger problem. Are CPU & GPU vcore present? If the internal LCD is unplugged, can you get an image on external monitor?

              Comment


              • #9
                Louis,
                I tested it with external monitor and it worked perfectly.

                Comment


                • #10
                  Are you testing this with an A1370 assembly? What is resistance to GND on pin 1 of U9000?

                  Comment


                  • menatwork
                    menatwork commented
                    Editing a comment
                    Yes, and my resistance to GND on pin 1 of U9000 is 1.003

                • #11
                  Resistance to GND on pin 1 of U9000: 1.003

                  Comment


                  • #12
                    What is 1.003? ohm, Kohm, Mohm, diode?

                    Comment


                    • #13
                      Mohm in diode mode

                      Comment


                      • #14
                        I have no idea what that means

                        Comment


                        • #15
                          Im not an engineer and I undestand 1.003 MΩ ( 1MΩ)

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