Usb Test Error - Prestigio CAVALIERE 141 Technical & Service Manual

Prestigio Cavaliere 141

8.10 USB Test Error

Symptom:
An error occurs when a USB I/O device is installed.
USB Test Error
Check if the USB device is installed
properly. (Including charge board.)
Yes
Test
OK?
No
Replace another known good charge
board or good USB device.
Yes
Re-test
OK?
No
Board-level
Troubleshooting
Correct it
Replace
Motherboard
Correct it
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:
M/B
U516
J3
CP2
CP3
RP18
RP22
R650
R646
120
Technical Service Manual
Signals:
Charge Board
J1
C502 USB_OC1# USBP2+
J503
J504 USB_OC0# USBP2-
U501
L516 USBP0+ USBP3+
U502
L514 USBP0- USBP3-
L508
L519 USBP1+ D/USBP2+
L506
L517 USBP1-
D/USBP2-
L511
R505 D/USBP0+
D/USBP3+
L509
R506 D/USBP0- D/USBP3-
C1
C511 D/USBP1+
R1,R2
L513 D/USBP1-
L505
L512 +5V_P
L504
C509