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Like I said before, I have only small light on led 2 and nothing else This is what I have found under Thermal camera https://www.dropbox.com/scl/fi/dzstjk8it3srqa6q174qe/Video-09-04-24-23-04-50.mov?rlkey=u95d7dvk8n1628hj0pmg1y9fv&dl=0...

Hi to All! I have an iMac 27 2019, motherboard 820-01236 Dead. When i Connect power supply, I can barely see a light from the second led Nothing happens if i try to to boot the system I’ve Tried to Connect my power bench supply directly to the motherboard and I have this behaviour...

Could you help me please?

i'm pretty sure that usb ports were changed....so i would like to check in diode mode each pin of both usb soldered on the mothgerboard...but i have not other motherboard to compare

any hints?

yes i mean Thunderbolt controller !

I’m 100% sure that they have changed usb ports….because i have found t2 shield resoldered…..so I Think there must be an hardware problem….but i have not diode mode readings for usb port

i've tried to connect an usb mouse...it doesn't work at all

i've flashed this https://drive.google.com/file/d/1LG3gKv3fU1177Qq-quX0FJbkpxxnFEwD/view now i can't here the boing sound at the start up.,,, still no ssd, and no usb till wifi frozen

edit

I have not medusa! I have downloaded your rar, and There are 2 bin inside I have used the one with the name 820-00840 8hv22 medusa clean ME + pram.bin

I’m not able to flash 820-00840 8hv22 medusa clean ME + pram.bin I have this error https://www.dropbox.com/scl/fi/yk6h8icxv4exdjvwnewog/Foto-21-03-24-21-29-59.jpg?rlkey=o3l7nxbucr0qrln1l3mpeqk1l&dl=0 No problem flashing my dump

Is it better to clean MY bios?

could you clean my dump for me? (if is it possible) https://www.dropbox.com/scl/fi/qe3eq49ct85btonct3duf/DUMP-820-00840GIOTTINOVIDEO.BIN?rlkey=lxgp4tek1x72189vh88r6bhv4&dl=0

why you said something like this? have you a link for it?

If i write the wrong password, it not hangs, but load load load load load with no error or ends….

Edit.

i don’t know the history of this board…I’m pretty sure that u3900 was touched/changed (i don’t know why) Motherboard boot with “no disk error.” Tried another disk, same error! It can’t see usb bootable from both usb USB stick light stay on fixed As soon as i try to boot in Recovery and...

Ahhhhhhhhh ok! Now I’m under stand!

So how can i reprogram it, if machine doesn't boot? in the istruction it says Insert your USB stick, then power on the device whilst holding Option ⌥