820-02020-11

[Soji]

The Board draws 20v 0A with charger and battery connected ppbus_g3h=10.76...
With only battery connected ppbus_g3h =10.77
With only charger connected is draws 5v 0.02A and
Ppbus_g3h is 12.04V..
All other power rails are present and stable.

Have tried DFU restore and gives this error
GAVE UP WAITING FOR DEVICE TO TRANSITION FROM DFU STATE TO DFU STATE

 

[2informaticos]

Check for short on all coils.
Also check around U7700/8100.

SSD voltages come on?

 

[Soji]

SSD Voltages not present
Diode mode to ground on coils around u8100:
L82B0/B1=0.123
L8270=0.245
L8120=0.038
L8230=0.340
L84E0=0.302
L8290=0.285
L8281/80=0.198..
Around u7700
L77A0=0.180
L7760=0.361
L77D0=0.278..

L5800=0.185
L5820=0.185
L5840=0.185

 

[2informaticos]

Any history available?
Someone else worked on it before?

 

[Soji]

No the board is very cleen and sharp.

 

[2informaticos]

Reflash SoC ROM and try again DFU.
Don't forget to make backup first.

 

[Soji]

Can u help us with SoC ROM file?

 

[2informaticos]

Sorry, I don''t have any known good for M1.

You may find something on badcaps forum, just search.

 

[Soji]

Thanks
The customer run out of patience he has picked it up