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LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
L705i has a protective circuit for non-booting from USB. When the phone is booted from USB_VBUS
without Battery, booting current might be insufficient. Sometimes, this scheme can break the USB port
on a computer. So, L705i does not support booting from USB.
3. TECHNICAL BRIEF
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Figure. Schematic of USB protective circuit
2
4
5
3
1
KRX102E
Q402
USB_VBUS_IN
PS_HOLD
USB_VBUS
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