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820-01041-A Without BOTH internal display, And External and Backlight.

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    #1

    820-01041-A Without BOTH internal display, And External and Backlight.

    Hello I have an 820-01041-A that does not have BOTH display and Backlight. The MBP was working properly to wake up without Display overnight. I have Tried SMC and NVRAM reset they both are not solving my Problem. The CapsLock on the KeyBoard, is working when you power it ON, and when you plug the Charger it's Responding with a sound that signifies the MBP has BOOTED in to SYSTEM. I have tried an HDMI (external Screen) its NOT Displaying anything. Also the INTERNAL Display Shows nothing.
    1. I have Changed U9850 and the results are still the same, Discovered that the IC is working on a Good Known Board and it Displayed on My DONOR(board) so the U9850 was working, But I just Swapped anyway.
    2. U1200 should create EDP_IG_BKLT_EN - 0v but it is 0v
    the Device had no liquid Damage or any Sings of Corrossion, No physical Damage, i have inspected through the microscope.

    Voltage AND DIODE MODE measurement (red probe on ground and without power connected), I have tested With SCREEN CONNECTED.

    U8500
    1. 5,1v (0.350)
    2. 3,3v (0.560)
    3. 5,1v (0.350)
    4. 5,1v (0.350)
    5. 5,1v (0.500)
    6. 5,1v (0.500)
    7. 5,1v (0.676)
    8. 0v (GND)
    U8501
    1. 3,3v (0.315)
    2. 3,3v (0.560)
    3. 3,3v (0.315)
    4. 3,3v (0.315)
    5. 3,3v (0.330)
    6. 3,3v (0.330)
    7. 3,3v (0.612)
    8. 0v (GND)
    U8510
    1. 3,3v (0.329)
    2. 3,3v (0.535)
    3. 3,3v (0.695)
    4. 3,3v (0.706)
    5. —
    6. —
    7. —
    8. 3,3v (0.598)
    9. —
    10. —
    11. —
    12. 3,3v (0,707)

    U9801 on this IC I will Post Lines I am thinking they have abnormal Voltages

    (5) GMUX_IOEXP_ADDR_SEL - 0v

    (21) USBC_HPD_DET - 0v

    (26) DP_INT_EG_HPD - 2,5v

    (27) EDP_MUXSEL_OVR - 0v

    (29) TP_BKLT_BOOST_EN - 0,47v

    (31) TP_BKLT_FAULT_L - 0,9v

    (32) DP_INT_IG_HPD - 3,3v

    (34) EDP_IG_BKLT_EN - 0v (weird right)


    Different Lines Measured

    DP_INT_IG_HPD - 3,3v

    LCD_MUX_EN - 3,3v

    PP5v_S0SW_LCD - 5,1v

    PP5V_S0_ALSCAM_F - 5,1v

    PP3V3_S0SW_LCD - 3,3v

    EDP_PANEL_PWR_EN - 3,3v

    PPVOUT_S0_LCDBKLT - 55,35v

    PANEL_P3V3_EN - 3,3v


    I have Come to seek you Help to Direct me on right Path.
    Tags: None
    #2
    How was the external hdmi screen tested? Using a compatible usb c to hdmi dongle?

    Comment

      #3
      yes and also using the usb c hub with different ports

      Comment

        #4
        But key caps led does toggle?

        If yes, enter the password for the unit in an attempt to allow the OS to boot to the desktop you cannot yet see.

        The type C dongle should permit the use of the external display but not sure if it enables after the logon stage of the OS. You may have to press a special function key.

        I believe if you close the laptop lid, then the external screen may also become active. Test that idea as well.

        Test also safe mode booting.

        Comment

          #5
          let me do so, i will post findings

          Comment

            #6
            I have tried to enter password for the MBP when "it booted" it did not post anything onto the external display or even internal.

            i have tried to enter Safe mode its just blank black screen

            Comment

              #7
              Try a DFU.

              https://youtu.be/ywvDgn7JR_c?feature=shared

              Comment

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