820-3435-b no keyboard/usb/trackpad input

No signs of liquid damage. usb ports have power but wont detect a usb mouse,keyboard or drive.
power button works but the rest of the keyboard and trackpad dont work. pp3v42 is present on pin 19.

the computer buts to internal drive but no user input devices work so further testing isnt possible.
j6955 had some minor corrosion but backlight still comes on.
 

2informaticos

Administrator
Staff member
Disconnect LIO flex and test only onboard USB from MLB.
Check XDP_USB_EXTA_OC_L level when a device inserted.
Be sure L4600 is OK.
You can remove U4650 and bypass it.
Also chek in diode mode all USB data lines.
Any sign of incorrect use of USB ports?
 
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