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820-00165 not booting fully, tried practically everything.

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  • captainmac
    replied
    Thanks for posting this. Will have a look at that next time still weird that it works now though.

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  • Inwerp
    replied
    Thanks to Discord chat, piernov and ChrisB, we found a solution for this problem.
    Q1920 is a Strap to temporarily disable ME region. I had 2 boards, 820-3437 and 820-00165, both with the same "boots till 100% than freezes" and "iGPU kext timeout" in Verbose mode.
    3437 had some water damage on R9120 and R9121, 00165 was completely clean but after i repaired the first one i've found that there was a low resistance between GND and SPI_DESCRIPTOR_OVERRIDE_L lines.

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  • captainmac
    replied
    Just an update for people reading this topic with similar issues

    Got an email from the customer that the MacBook Air suddenly decided to boot up fully (he sent me a photo of the login screen)
    This absolutely baffles me. have no clue what the issue was and will probably never know now.

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  • 2informaticos
    replied
    Only to confirm the issue...

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  • captainmac
    replied
    I might not have time for this.. but what would that eventually tell me? I mean, if it's about to be the iGPU (CPU) than i'm calling it quits

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  • 2informaticos
    replied
    I don't know how Linux manages the graphics.
    Can you try Windows and run some graphics stress, after driver installed?

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  • captainmac
    replied
    yeah figured as much..
    i just did: flashed it on there without cleaning ME: no change in symptoms
    Cleaned ME afterwards: Same difference..

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  • 2informaticos
    replied
    Yes, try that.
    In fact, you can try the dump as is; just to see any difference about graphics.
    And finally clean ME...

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  • captainmac
    replied
    My Google Fu is not good enough to find it on here so far, lots of dumps, but none clearly stated for 2017.
    I can try getting a dump from a fixed 2017 MacBook Air from the queue, flash it on this one and clean ME?

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  • 2informaticos
    replied
    BIOS files you've tried, 2017 year?
    One should be already posted on the forum...

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  • captainmac
    replied
    Just to let you know, i installed the intel graphics drivers for ubuntu, and everything works properly. so i am now assuming its a RAM issue? Weird that it works perfectly on Ubuntu..

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  • 2informaticos
    replied
    RAM, or CPU issue...

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  • captainmac
    replied
    ok, so that would basicaly tell me if the intel gpu is defective right?
    what else could it be at this point..? I mean, i dont have a lot of time to start fiddling with ubuntu-drivers and such, and basically this is boiling down to either a bad cpu or integrated gpu right?

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  • 2informaticos
    replied
    Install Intel graphics now and see if still good.
    It may used generic one.

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  • captainmac
    replied
    Got a Ubuntu boot disk: boots up fine, everything works

    Leave a comment:

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