A1990 820-01041 - 5V/0.07A no SSD voltages, goes directly to DFU

[it-solve]

No short, no liquid damage. Slight dust.

Seems common issue with this model, but could not narrow it down.

Pulling 5V/0.07A No signs of life.

PPBUS_G3H_SSD0_SNS = 12.3V
SSD_VR_P2V5_EN = 0V
PP3V3_G3H_SSD0_SNS = 3.3V

And of course it has to be a data recovery case, so no DFU Restore

 

[2informaticos]

Did you test with charged battery?

 

[it-solve]

With a spare new battery (Im almost certain its above 50% level) and bare board on bench, charger goes to 20V/0A.
Also, tested with original used one, 5V/0.06A

PPBUS_G3H = 11.66V
Still no SSD voltage and still in DFU mode

 

[2informaticos]

Tried DFU revive?

Compare diode mode readings on all big coils with good board.
Do the same for all SSD power rails.

 

[it-solve]

Yes DFU Revive gives Error 9.

I dont have a working A1990 on hand. Will compare to a faulty one I have.

 

[2informaticos]

OpenBoardData Project

It may help...

 

[it-solve]

Thanks, would you happen to know how to load this into the flexBV? Seems like it creates a blank odbdata file for each schematic.

 

[2informaticos]

No idea, I don't use flexBV...