Apple iMac A1419 820-4652

Discussion in 'BIOS/UEFI' started by technical, Sep 18, 2016.

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  1. technical

    technical Moderator Staff Member

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    Apple iMac A1419 820-4652-A
    BIOS Mid 2015
     

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    #1 technical, Sep 18, 2016
    elabas, Macfixit and Siroos_tz like this.
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  2. Gurmeet bhatia

    Gurmeet bhatia Well-Known Member

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    above bios not working
     
    #2 Gurmeet bhatia, Mar 31, 2018
  3. technical

    technical Moderator Staff Member

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    not working how?
    old bios and macbook error what?
    Please provided many info where want i help.
     
    #3 technical, Mar 31, 2018
  4. Gurmeet bhatia

    Gurmeet bhatia Well-Known Member

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    the customer original bios give giving display on USB and external after removing the internal LCD

    if you put the LCD the machine turn off / restart after the CHIME sound comes before the display .

    i want to try first with the working bios . then later i check other problems .
     
    #4 Gurmeet bhatia, Apr 28, 2018
  5. technical

    technical Moderator Staff Member

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    bios above work 100% can only is Me Region problem, you can Clear me or send file old i help.
     
    #5 technical, Apr 28, 2018
  6. hernan tangoa f.

    hernan tangoa f. Well-Known Member

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    schematic and boardview please 820-4652-A
     
    #6 hernan tangoa f., May 2, 2018
  7. technical

    technical Moderator Staff Member

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    #7 technical, May 2, 2018
  8. Nenad63

    Nenad63 New Member

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    The iMac worked on the extern display via the minidisplayport, after rewriting the dump with your dump file, only the first two LEDs are logging in, no sound. And unfortunately when I get my dump, the guy looks the same - dead. I'll send you your dump file, so I hope your help.Nenad
     

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    #8 Nenad63, Aug 1, 2018
  9. technical

    technical Moderator Staff Member

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    A1416 820-4652-A mx25L6406e.bin
     

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    #9 technical, Aug 1, 2018
  10. Nenad63

    Nenad63 New Member

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    Hope it is not a problem with chip model, 25Q064A is on my logic board
     
    #10 Nenad63, Aug 1, 2018
  11. Nenad63

    Nenad63 New Member

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    Not this dump, they are not the same size
     
    #11 Nenad63, Aug 1, 2018
  12. Nenad63

    Nenad63 New Member

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    do you still have an idea
     
    #12 Nenad63, Aug 1, 2018
  13. technical

    technical Moderator Staff Member

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    No problem, I want to know the results after programming ?
     
    #13 technical, Aug 1, 2018
  14. Nenad63

    Nenad63 New Member

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    Programming is OK, but iMac does not start....

    iMac 3.5 GHz Core i5 iMac iD 15.1
    Apple iMac A1419 Late 2014 Mid 2015 Mf886LL 27" Logic Board 820-4652-A 661-00191
     
    #14 Nenad63, Aug 1, 2018
  15. technical

    technical Moderator Staff Member

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    can have hardware error ?
     
    #15 technical, Aug 1, 2018
  16. Nenad63

    Nenad63 New Member

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    Unbelievably, until about an hour ago, iMac worked with an external display...
     
    #16 Nenad63, Aug 1, 2018
  17. technical

    technical Moderator Staff Member

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    now have work external display ? can give one photo.
    and can try add bios clear me i update on top.
     
    #17 technical, Aug 1, 2018
  18. Nenad63

    Nenad63 New Member

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    no, no external display now, only the fan starts and the first two LEDs..
     
    #18 Nenad63, Aug 1, 2018
  19. Nenad63

    Nenad63 New Member

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    in any case, thank you for your help
     
    #19 Nenad63, Aug 1, 2018
  20. technical

    technical Moderator Staff Member

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    now BIOS old you send same problem not work ?
    check hardware all Please
     
    #20 technical, Aug 1, 2018
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