820-00012 shorted on PP5V_S4

[VinceLx2]

Hi,
This I/O board from a Macbook Pro Retina 2015 is preventing the main board to start because it's shorted on PP5V_S4.
Do you have a schematic for it? I cannot find it on internet.
Can I inject some voltage on PP5V_S4 to find the short?

 

[2informaticos]

Once RIO board is disconnected from MLB, is safe to inject voltage.
Start with 1V, as always; set amp limit on PSU to max first.