LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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4.7 USB
USB Initial sequence of L705iX is :
USB connected to L705iX power on
→
USB_VBUS(Q301 PIN4) go to 5V
→
USB_D+ go to 3.3V
(D300 PIN1)
→
USB_VP and USB_VN is triggered
→
USB work.
Start
Q301 PIN4 is 5V?
USB_D+ is 3.3V?
Change the Main board
Check Q301
Check D300
NO
YES
YES
NO
Cable is inserted?
YES
Insert cable
NO
Power is on?
YES
Go to power on trouble shooting
NO
Z3X-BOX.COM
Summary of Contents for L705ix
Page 185: ...Note Z 3 X B O X C O M ...
Page 186: ...Note Z 3 X B O X C O M ...