LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4.8 USB trouble
USB Initial sequence of KS10 is :
USB connected to KS10
→
USB_VBUS_IN(VA205) go to 5V
→
USB_VBUS_EN go to high (Q702 Pin_2)
→
USB_VBUS(D701) go to 5V
→
USB_D+(VA202) go to 3.3V
→
48M Crystal on
→
USB_DATA is triggered
→
USB work
Start
USB_VBUS is about
to 5V?
USB_D+ is about to 3.3V?
48MHz is run?
Change the Main board
Check Q702, D701
USB cable
Check VA202
Check X600
NO
YES
YES
YES
NO
NO
Cable is insert?
YES
Cable insert
NO
X600(48MHz)
VA202 (USB_D+)
VA205(USB_VBUS_IN)
D701(USB_D+)
Содержание KS10
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