MiTAC 8050QMA Manuel de service télécharger pdf (Page 128)

127

50QMA

N/B Maintenance

8.9 USB Test Error-1

An error occurs when a USB I/O device is installed.

Re-test

OK?

Test

OK?

USB Test Error

Check if the USB device is installed

properly.

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.

Replace another known good USB

device.

Board-level

Troubleshooting

Correct it.

Replace

Motherboard

Signals:

USB_OC0#

USB_OC1#

USBP[0..3]+

USBP[0..3]-

+VCC_USB_0

+VCC_USB_1

+VCC_USB_2

+VCC_USB_3

+5V

SW_VDD3

Parts:

U709

U501

U503

J701

J706

L10

L13

F503

F504

C501

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