6.9 USB Ports Failure
An error occurs when a USB I/O device is installed.
Re-test
OK?
Test
OK?
USB Ports Failure
Check if the USB device is installed
properly.
Yes
No
Yes
Check the following parts for cold solder or one of the following
parts on the mother-board may be defective, use an oscilloscope
to check the following signal or replace the parts one at a time
and test after each replacement.
No
Replace another known good USB
device.
Board-level
Troubleshooting
Correct it.
Correct it.
Replace
Motherboard
Signals:
Parts:
U712
J710
J713
BKJ701
EL46
EL64
U7
EL37
U711
EL730
U714
L714
BKEL701
BKEL701
+5V
SUSC#
USB_OC2#
USB_OC0#
USB_OC3#
USBPP3
USBPN3
USBPP2
USBPN2
USBBKPP0
USBBKPN0