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Apple iMac A1419 820-4652 Schematic and Boardview

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 .
 
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.
 
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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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
 
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