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820-00165-A 2017 Macbook Air, Backlight on but no image

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  • 820-00165-A 2017 Macbook Air, Backlight on but no image

    Hello it should be noted that I am noob,
    This had liquid damage on the I/O board flex cable connector on logic board, first it would turn on no chyme with backlight on but no image.
    Was unresponsive to NVRAM reset . it Performed SMC reset.
    After using the Medusa 2 to clear PRAM and ME region it now turns on and chymes back light on but no image.
    I have tested with known working screen.
    Anyone had this before?

  • #2
    Do you get pure white screen, or just black with backlight?
    Test the machine disconnecting LIO flex.
    Be sure to use original Magsafe 2 (two) charger; not an adapter from previous Magsafe 1 model.
    Did you test external video?

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    • #3
      Hi mate the screen stays black with backlight on.
      Tested without LIO flex same outcome
      Am using original mage safe 2
      External video shows nothing.
      Have also test with a usb drive it shows not reading any data. seems to be brain dead?

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      • #4
        Is time to use full known working BIOS.
        Clean ME region after flashed on the board.

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        • #5
          Alright so I can copy a bios from a working board and flash with the medusa. Does it have to be the 2017 model or will 2015 work too?

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          • #6
            Does it have to be the 2017 model or will 2015 work too?
            2017 has a different processor=hardware, so nope.

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            • #7
              I flashed a known good bios from a 2017 model and cleaned the ME region still brain dead. Anything else I can do or is this a donor board now?

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              • #8
                I hope you've cleaned ME region with Medusa.
                If not available, try the BIOS file as is; just for test, to see if something change.
                Swapping ME region with stock/generic one (even clean) is not the correct way.

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                • #9
                  I copied a known good bios and flashed it onto the not working board and cleaned the ME region afterwards (With the Medusa) is this not the correct way?
                  Last edited by Greg; 1 week ago.

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                  • #10
                    Reball, or change SMC.
                    If no change, probably CPU issue...

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                    • #11
                      Thanks for the helps mate but reballing and changing a SMC is beyond me at present.

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