Usb Trouble - LG -S310 Service Manual

4.4 USB Trouble

Check the USB power and signal
- VUSB_CHG_IN (TP1)
- VBAT (TP2)
- MUIC_IO_P (TP3) , MUIC_IO_M (TP4)
VUSB_CHG_IN
TP1
C410
0.1u
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
FL400
OUT IN
GND2 GND1
TP4
MUIC_IO_M
MUIC_IO_P
TP
MUIC_ACC_ID
Figure 4.4.1 USB Circuit
- 65 -
4. TROUBLE SHOOTING
TP2
CN401
6
7
8
1
2
3
4
5
9
C417
10
11
22p
BQ25040
EUSY0388501
11
PGND
1 10
IN BAT
2 9
U402
ISET _PG
3 8
VSS1 CHG
4 7
LDO VSS2
5 6
IFULL EN_SET
LGE Internal Use Only