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820-3115 only starting without screen attached

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  • Fizzl92
    replied
    R7430 is correct. I gave CPU a reflow same way i do with 2011 MBP/iMac GPU issues to test if its really a GPU problem but that did not change anything aswell...
    So i think its time to give up here...
    Last edited by Fizzl92; 05-06-2019, 11:52 AM.

    Leave a comment:


  • 2informaticos
    replied
    This should be something related with AXG block from CPU.
    Try to reflow CPU.
    Check first if R7403 is correct.

    Leave a comment:


  • Fizzl92
    replied
    Is there something else i could try?

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  • Fizzl92
    replied
    Yes it stays on with everything except monitor connected (+USB mouse and pen drive). It starts, chimes and even talks to me after few seconds if i plug my Mavericks USB drive in (it has the voice over thing enabled...)

    Leave a comment:


  • 2informaticos
    replied
    Machine stays on for long time if no monitors connected?
    Test it only with USB mouse and OSX pendrive, to assure stable activity

    Leave a comment:


  • Fizzl92
    replied
    Ok i flash original Bios back. Yes, it only starts with both monitors disconnected. If there is any monitor plugged in (internal or external) fan just twitch one time. After the fan twitched i can hear a quiet "brumming" sound from the fan and can feel it vibrating until i unplug battery... Pressing power again results in no reaction (no 2nd fan twitch)

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  • 2informaticos
    replied
    Recharge original BIOS, as is not BIOS issue.

    So machine doesn't even start if external monitor is connected?
    Do you also need to unplug LCD to start?

    Leave a comment:


  • Fizzl92
    replied
    I tested the file from the other post you linked me to but still the exact same issue.

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  • 2informaticos
    replied
    Link already uploaded on the forum...
    https://boards.rossmanngroup.com/for...t-efi-firmware
    If still the same, then 100% no BIOS issue.

    Leave a comment:


  • Fizzl92
    replied
    I hope so. If you have one that is 100% sure working and it you would provide that i can try that aswell but as i get the exact same issue i guess thats not a bios thing.

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  • 2informaticos
    replied
    Known good working BIOS, with clean ME for sure?

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  • Fizzl92
    replied
    yes but no change unfortunately

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  • 2informaticos
    replied
    Did you reflash BIOS?

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  • Fizzl92
    replied
    I get on both sides 2.5 V at D3895. TBT_A_HV_EN is not there but at the same time i can see a question mark folder on external monitor plugged into J9400

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  • 2informaticos
    replied
    Which pin of D3895?
    High voltage should appear on K.
    But you should get 5V on A, if Q3880 is enabled...

    Leave a comment:

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