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8355 N/B MAINTENANCE
8355 N/B MAINTENANCE
146
Correct it
Correct it
USB Test Error
Check if the USB device is installed
properly. (Including charge board.)
Re-test
OK?
No
Yes
No
Yes
Check the following parts for cold solder or one of the following
parts on the MB and Charge BD may be defective, use an
oscilloscope to check the following signal or replace the parts
one at a time and test after each replacement.
Parts:
U20
U3
U501
J521-524
R8
R10-12
C48
C50
L501
L503
L504
L1
L25
Signals:
+5VS
USB_OC[0:3]#
USBP0_P
USBP0_N
USBP1_P
USBP1_N
USBP2_P
USBP2_N
USBP3_P
USBP3_N
Replace another known good USB
device.
Board-level
Troubleshooting
Replace
Motherboard
Test
OK?
Symptom:
An error occurs when a USB I/O device is installed.
8.10 USB Test Error
L28
L14
L38
R360-363
R356-359
C502
C868
C506
C508
R3
R544
C33
C1
C45
R510
R509
C504