820-3787-A no USB from both ports

[Davis]

no liquid or damages to see..any usual suspect?

 

[dukefawks]

5V present on the ports? Any other USB devices working like BT and trackpad in boot menu?

 

[Davis]

5V present on the ports? Any other USB devices working like BT and trackpad in boot menu?

No, 5v gives 0. something at first touch and goes down to 0. - TP and BT worked just fine but no usb on both ports..strange.

 

[dukefawks]

Check if USB_EXTB_OC_L and USB_EXTA_OC_L are high. Disconnect right IO board and see if USB on the board has power.

 

[Davis]

USB_EXTA_OC_L = 0.024 on U4600 and USB_EXTB_OC_L = 3.022 pin 3 on J9510

 

[dukefawks]

That means that J4600 is drawing too much current. Either a short on the 5V line from U4600 to J4600 or dead U4600.

 

[Davis]

That means that J4600 is drawing too much current. Either a short on the 5V line from U4600 to J4600 or dead U4600.

Ok so I got today a message USB DEVICES DISABLED unplug the device using too much power etc.. guess J4600 drawing too much current, what is the options here? considering ultrasonic to begin with but what if it doesn't help? only replacment?

 

[dukefawks]

I already gave you the possibilities, fix this thing. U/S is not gonna do anything....