4. TROUBLE SHOOTING
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Only for training and service purposes
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4.11 USB Trouble shooting
The sequence of LG_P880 USB is,
USB connected to 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.
START
Cable is inserted?
Insert Cable
Yes
Change The main board
C6027(TP2) is
4.5~5V
Check MUIC or charger IC
No
USB_D+(TP1)
is 3.3V?
Check IC UI3005
No
No
Yes
Yes
7.1 USB Trouble shooting
The sequence of LG_P880 USB is,
USB connected to
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
AP33
XMM6260
MUIC
uUSB
Connector
2T
SW
2T
SW
UART
UART
UART
UART
USB
USB
Corn
Corn