Usb Trouble Shooting - LG -P880 Service Manual

7.1 USB Trouble shooting

4.11 USB Trouble shooting
The sequence of LG_P880 USB is,
The sequence of LG_P880 USB is,
USB connected to
USB connected to LG_P880->USB_VBUS(C6027) goes to 4.5V~5V -> USB_D+ go to 3.3V -> USB work
LG_P880  USB_VBUS(C6027) goes to 4.5V~5V  USB_D+ go to 3.3V  USB work
Block Diagram of USB & UART connection is shown below.
Block Diagram of USB & UART connection is shown below
UART
2T
UART
SW
Corn
XMM6260
UART
LGE Internal Use Only
AP33
2T
SW
USB
START
Cable is inserted?
Yes
C6027(TP2) is
4.5~5V
Yes
USB_D+(TP1)
is 3.3V?
Yes
Change The main board
USB
MUIC
UART
Corn
No
No
Check MUIC or charger IC
No
Check IC UI3005
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4. TROUBLE SHOOTING
uUSB
Connector
Insert Cable
Only for training and service purposes