LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 97 -
4.6.1 USB trouble
USB Initial sequence of KE990 is :
USB connected to KE990
→
USB_VBUS(C540) go to 5V
→
USB_D+(VA202) go to 3.3V
→
48M
Crystal on
→
USB_DATA is triggered
→
USB work
Start
USB_VBUS i s about
to 5 V?
USB_D+ i s about to 3. 3V?
48MHz is r un?
Chang e th e Main bo ard
Check C540, R514,U500
USB c able
Check VA50 0,U507,U304
Check X200
NO
YES
YES
YES
NO
NO
Cabl e is insert?
YES
Cable inser t
NO
X200(48MHz)
C540(USB_VBUS)
U507(USB_D+)
R514(USB_VBUS)
U500(USB_VBUS)
VA500(USB_D+)
U304(USB_D+)
Содержание KE990 - Viewty Cell Phone 100 MB
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