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Discussion in 'BIOS/UEFI' started by technical, Sep 18, 2016.
Apple iMac A1419 820-4652-A
BIOS Mid 2015
above bios not working
not working how?
old bios and macbook error what?
Please provided many info where want i help.
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 .
bios above work 100% can only is Me Region problem, you can Clear me or send file old i help.
schematic and boardview please 820-4652-A
A1419 bios 820-4652-A mx25L6406e
@hernan tangoa f. Unavailable schematic
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
A1416 820-4652-A mx25L6406e.bin
Hope it is not a problem with chip model, 25Q064A is on my logic board
Not this dump, they are not the same size
do you still have an idea
No problem, I want to know the results after programming ?
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
can have hardware error ?
Unbelievably, until about an hour ago, iMac worked with an external display...
now have work external display ? can give one photo.
and can try add bios clear me i update on top.
no, no external display now, only the fan starts and the first two LEDs..
in any case, thank you for your help
now BIOS old you send same problem not work ?
check hardware all Please