A1990 820-01041-A no power

[hgoncalves]

Hi,

I have an A1990 820-01041-A with no power.

It only puls 5V from USBC.

UB400 had USBC_TB_CC2 shorted (0.008 on diode reading), and I've replaced UB400.

Now, USBC_TB_CC2 has 0.606 on diode reading, but it still only puls 5V from USB C.

All CC1/2 has normal diode reading.

PPBUS_G3H seams to be shorted (0.002 on diode reading)

Can you help?

 

[2informaticos]

Check in ohm scale if any big coil has the same reading as PPBUS_G3H.
Don't forget L9080/580.

 

[hgoncalves]

Hi,

No big coil has the same ohm value (0.2 ohm), as PPBUS_G3H

 

[2informaticos]

Then is safe to use voltage injection method, to find the culprit.
As always, start with 1V; more than enough for 0.2 ohm resistance to ground.

 

[hgoncalves]

It worked.

TKS!