Apple iMac A1419 820-4652 Schematic and Boardview

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Apple iMac A1419 820-4652-A
BIOS Mid 2015
J78 MLB CTX
Schematic and boardview

 

[Gurmeet bhatia]

above bios not working

 

[ThienBui]

above bios not working

not working how?
old bios and macbook error what?
Please provided many info where want i help.

 

[Gurmeet bhatia]

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 .

 

[ThienBui]

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.

 

[hernan tangoa f.]

schematic and boardview please 820-4652-A

 

[ThienBui]

A1419 bios 820-4652-A mx25L6406e
@hernan tangoa f. Unavailable schematic

 

[Nenad63]

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

 

[ThienBui]

A1416 820-4652-A mx25L6406e.bin

 

[Nenad63]

Hope it is not a problem with chip model, 25Q064A is on my logic board

 

[Nenad63]

Not this dump, they are not the same size

 

[Nenad63]

do you still have an idea

 

[ThienBui]

Not this dump, they are not the same size

No problem, I want to know the results after programming ?

 

[Nenad63]

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

 

[ThienBui]

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 ?

 

[Nenad63]

Unbelievably, until about an hour ago, iMac worked with an external display...

 

[ThienBui]

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.

 

[Nenad63]

no, no external display now, only the fan starts and the first two LEDs..

 

[Nenad63]

in any case, thank you for your help

 

[ThienBui]

no, no external display now, only the fan starts and the first two LEDs..

now BIOS old you send same problem not work ?
check hardware all Please