820-01987 A ...... PPBUS_G3H Short

[rupesh.amit]

Help me remove the shorting from the board

No signs of Physical Damage or Liquid Damage
No history and Board looks clean under the microscope

Input Voltage : 5 V

F 7000 Pin 2 : 0.50 V & 54 ohm RTG

 

[2informaticos]

Check if you get the same value to ground on any big coil.
Don't forget to check at L9080 too.

 

[rupesh.amit]

No Same voltage on any other Coil, Not even on L9080or L9081

 

[2informaticos]

If the low resistance to ground doesn't come from any coil, then is safe to inject voltage.
Is not pure short, you will need higher voltage than usual; however, do not exceed 15V.
Start with low as 1V and slowly increase the voltage. Set first lab PSU amp limit to max.
Thermal camera can help a lot in this case, as probably nothing gets really hot.

 

[rupesh.amit]

Short Removed

Now
It is talking 0.60 mA
=============================

F 7000 = 12.35

L 7030 = 5V

WHat should be the best step?

 

[2informaticos]

Stop to test L7030 coil in the buck-boost converters.
No idea why the people still check voltage there; so dificult to see it is not directly connected to PPBUS_G3H?

Check if is detected in DFU mode.