LG LG-V909DW - 4.11 USB Trouble shooting

4. TROUBLE SHOOTING
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Only for training and service purposes
LGE Internal Use Only
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4.11 USB Trouble shooting
The sequence of LGV909DW USB is,
USB connected to LGV909DW Æ USB_OUT_5V(C1208) goes to 5V Æ USB_D+ go to 3.3V Æ USB_DATA is
triggered Æ USB work. Block Diagram of USB & UART connection is shown below
USB device mode Trouble shooting diagram

ͽ͸Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΀ΟΝΪ

4.11 USB Trouble shooting
The sequence of LGV909DW USB is,
USB connected to LGV909DW Æ USB_OUT_5V(C1208) goes to 5V Æ USB_D+ go to 3.3V Æ USB_DATA is
triggered Æ USB work. Block Diagram of USB & UART connection is shown below
USB device mode Trouble shooting diagram