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https://boards.rossmanngroup.com/threads/820-02020-exclamation-mark-after-start.64768/#post-106855

i have exactly same problem. have you solved it ? thanks

hello. only me have this problem?no one has this problem?

so no one have experience yes ?

no one have experience about same problem?

nothing else touched by me yet

so symptoms on these photos are with original nands ( before touch mac was like this) after i changed NANDs mac wasn't turning on at all and i put it in dfu mode and try restore during restore "apple logo" appears no any loading bar or exclamation in circle just apple logo and after 20 seconds...

yes already tried another cable, battery and even another housing

yes. exactly same model and same position.. 2 times ( transfered from 2 locked mothers) but not solved

already tried to change both nands but problem not solved.

no water damaged. tried another housing not solved. tried AC2 not solved https://ibb.co/523YxnZ https://ibb.co/nsXnr2P

not possible. i have 10+ pcs ans also i have big experience into board level soldering. i am doing iphone cpu works. so it is not possible

i coudn't fix it unfortunatelly.after mcu +eeprom transfer doesn't have image at all. so if anyone have any clue about this problem will be great. thanks

on A2337/8 when changing whole display no need any ic transfer. so it is not bounded to the motherboard. so here doesn't have matching problem beetwen "main motherboard" and "display motherboard"! in this case we have matching problem between "display motherboard" and display metric.this board...

https://ibb.co/GQc0gPf https://ibb.co/r6kPsHn https://ibb.co/WvyzZVy

now tried 2 more pcs and same result. when soldering io board back (from where i donored it) everything is working. so soldering excluded.. really strange problem:(

here is youtube video where this man not changing any eeprom. so it is not bounded. seems there is io board revisions and need match it. so anyone know how to differ it's revisions? i tried several pcs non of them working. all of them is 820-02004

no one have solution for this problem ?

do you know how to to match revisions ? is there anything written?

how to differ revisions ?