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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4.11 USB Troubleshooting
USB Initial sequence of KU380 is :
USB connected to KU380 power on
→
USB_VBUS(U304, pin #2) go to 5V
→
USB_D+ go to 3.3V
→
USB_DAT is triggered
→
USB work.
Start
U304, pin #2 is 5V?
USB_D+ is 3.3V?
Change the Main board
Check U304 (pin #2)
Check VA302
NO
YES
YES
NO
Cable is inserted?
YES
Insert cable
NO
Power is on?
YES
Go to power on trouble shooting
NO
Summary of Contents for Vodafone KU380
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