820-3476 different one no io board

[Repairable]

Hi all, got in a MacBook 820-3476 this one does not reconize USB from the io board.

wifi works
hdmi works also


tested differnt cables and io board all the same

j9500 pin4 5.15v
pin3 3.344volt

 

[dukefawks]

Diode mode on pin 15 and 17 of J9510. Inspect those pins for damage too.

 

[Repairable]

pin17 0.404
pin15 0.398
pins look nice and shiny

 

[dukefawks]

Check if all 4 USB over current inputs are high EXTA_OC_L and EXTB,c,d

 

[Repairable]

XDP_USB_EXTA_OC_L 3.278v
XDP_USB_EXTB_OC_L 3.276v
XDP_USB_EXTC_OC_L 3.268v
XDP_USB_EXTD_OC_L 3.268v

had a short moment of usb mouse light, but only 1 time ....

 

[dukefawks]

There is nothing more to this. Just 2 data lines, 5V and the over current protection. Could be a bad USB port on the PCH. You did check for stable 5V under load by plugging in a USB HDD to see if it spins up?

USB_5 seems to be free on the PCH, if the test points are accessible then you could wire them to the bad port.