LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4.6.2 UMS(USB MASS STORAGE) trouble
UMS Initial sequence of KE990 is :
USB connected to KE990
→
VREG_5V(R335, UMS) go to 5V
→
VREG_USB_3.3V(R301) go to 3.3V
→
USB_DATA is triggered
→
USB work
4. TROUBLE SHOOTING
- 98 -
Start
VREG_5V is about
to 5 V?
VREG_USB_3.3V is
about to 3.3V?
MICRO SD function OK?
Change the Main board
Check R335, D501
Check R301, C529, USB CA BLE
Follow the micro sd trouble
NO
YES
YES
YES
NO
NO
Cabl e is insert?
YES
Cable inser t
NO
C529 (VREG_USB_3.3V)
D501(VREG_5V)
< TOP SIDE >
R335(VREG_5V)
R301(VREG_USB_3.3V)
Содержание KE990 - Viewty Cell Phone 100 MB
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