820-3437 usb3 issue

[jadao]

This one was water damage with ssd not being detected and web cam not working flashing green light.
Fixed these issues, and discovered the MLB usb port doesn't run my usb3 external HDD. It powers on but no data.

If I plug in a mouse or a keyboard it works fine so I guess usb2 is ok.
The LIO usb port is fine both USB3 and USB2 are working.

There is only diode and caps on the usb 3 transmit and receive lines witch check fine, after that it goes directly to PCH ;(
Diode mode on USB3_EXTA_R2D_C_N and USB3_EXTA_R2D_C_P are 0,344 witch looks good compared to other board...Also continuity and diode mode on each pin matches an other board.

Looks like I am screwed, do you have an idea my last resort will be an ultrasonic...

Thanks

 

[2informaticos]

C4620/21 are both OK?
Check resistance to ground on their pins which go to PCH.
Also check the traces to J4600.

 

[jadao]

Sorry about that, it was dumb...I realized my usb port on the hdd enclosure is intermittent...
case solved, tired sorry!