820-3330-B no USB ports

[2informaticos]

Check USB 2.0 data lines; pay atention to series coils and diode protection to ground.
Compare diode mode readings with good board.

 

[Sr. Robot]

Visually the line looks great.

Diode redings:

Bad Board: Good Board:

USB_EXTA_MUXED_F_N : 0.495 0.484

USB_EXTA_MUXED_F_P: 0.0 0.478

USB_EXTB_F_N: 0.448 0.438

USB_EXTB_F_P: 0.0 0.4.38

 

[Sr. Robot]

Replaced both diodes and also had to replaced L4600/700 now the ports are working all right.

Thank you very much.