LIQUID 820-01958-A NO BOOT

[thomamagic]

hello, please need help for mainboard 820-01958-A
i have 20V and macbook enter in DFU,
i have flash and no boot
I hear by putting my ear near the motherboard a component that sizzles but impossible an identifier
L7690 i have 5V, L7670 i have 3.3V
ppbus : 12.52V
thanks for your help

 

[2informaticos]

Can you complete DFU?
Tried both revive and restore?

Check diode mode to ground on big coils and compare with good board.

 

[thomamagic]

dont have same board working for compare with
YEs i have test revive and restore . Complete but after no image no fan no sound

 

[thomamagic]

i test flash u4770, do you have original bin file? Thanks

 

[2informaticos]

Try it, just in case.

A2179 T2 Unlock Data.BIN

drive.google.com

But shouldn't be the problem, if DFU completes without errors.

You can still make an idea about diode mode readings, even no comparison board available.
Logi.wiki page has various models, not sure for this one however; just check there.
Also strange readings may be detected without any refference...