820-01949 boot issue

[2informaticos]

Then the problem is not related with mentioned MOSFETs.
The discharge circuit can cause such problem, but in the first seconds/minutes; before the controlled power rails are not completely discharged.

 

[Kyle93]

What do you suggest to fix that or is this kind of problem not fixable? The mentioned mosfet areas had no liquid damage

 

[2informaticos]

Save data and try DFU restore.

 

[Kyle93]

DFU restore failed with error 4042 "gave up waiting on device to transition from dfu state to dfu state"

 

[2informaticos]

Machine still boots now?

 

[Kyle93]

No. Just 20v and charges the battery. No fan spin or screen activity now.

 

[2informaticos]

Try again DFU revive/restore.
It may work after several attempts...

 

[Kyle93]

Restore completed successfully after another attempt however board is now not powering on. During the restore process there was no screen activity.

 

[2informaticos]

Which coils get voltage?

 

[Kyle93]

L7030 5V L7660 3.3V L7600 5V

All other coils are 0v

 

[2informaticos]

This is annoying.
How can DFU make working machine unresponsive?
Apple doesn't care at all about clients.

SSD voltages come on?
Also check other G3S voltages...