3. TROUBLE SHOOTING
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3.15 USB
The sequence of USB connection:
USB cable is plugged into LG-D605 and host device -> USB_VCHG goes to 5V -> USB_DP goes to 3.05V -> USB_DATA is
triggered -> USB working
Block Diagram of USB connection is shown below.
START
Change the Main Board
Check VCHG is 5V?
Yes
Cable is inserted?
USB_DP is 3.05V?
Yes
Insert Cable
No
Check C6007(TP1)
No
Check FL6002(TP2)
Yes
No
4. Trouble Shooting
4. 15. USB
79
The sequence of USB connection:
USB cable is plugged into LG-D605 and host device
USB_VCHG goes to 5V
USB_DP goes to 3.05V
USB_DATA is triggered
USB working
Block Diagram of USB connection is shown below.
MSM8230
PM8038
USB_ID
MSM_USB_DP
MSM_USB_DM
C13027
FL1 #2 pin
VCHG
Start
Cable is inserted?
USB_IO_P is 3.3V?
Change the Main board
Insert Cable
Check U15001
N
Y
Y
N
VCHG is 5V?
Check C7072
N
Y
USB_DP is 3.05V?
C6007
FL6002