4. TROUBLE SHOOTING
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Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4.11 Charging Trouble Shooting
1. Charging Procedure
- Connect TA or u-USB Cable
- Control the charging current by LP8727-B IC
- Charging current flows into the battery
2. Check Point
- Connection of TA or USB Cable
- Charging IC (LP8727-B)
- Battery
3. Troubleshooting Setup
- Connect TA and battery to the phone
4. Troubleshooting Procedure
- Check the charger (TA or USB Cable)
- Check the OVP Circuit
- Check the Charging IC
- Check the battery
FL11001
5
6
3
1
4
2
P2
P4
P1
P3
P6
P5
ZD11000
CN11001
VBUS_CHG_IN
FL11000
IN
OUT
GND1 GND2
D11001
MAX_DP
MAX_DM
USB_ID
u-USB Connector
VBUS 2mm
2mm
TA (5.1V, 700mA)
U4005
C5
D2
B5
D3
D1
E1
E2
E3
E5
E4
A1
C1
B1
A4
A5
A3
A2
D5
D4
C4
C3
C2
B2
B3
B4
SC
L
SD
A
INT¡
¬
GND1
GND2
GND3
GND4
BATT2
DN
DP
U1
U2
AUD1
AUD2
MIC
VBUS1
VBUS2
D-
D+
ID
RES
DSS
EXPDET
CAP
BATT1
R4034
10
K
C4082
1u
1u
C4083
TP4001
VBUS_CHG_IN
VREG_MSME_1.8V
4.7K
R4036
C4081
1u
R4035
4.7K
C4080
1u
VBAT
GND
UART_TX
UART_RX
USBH_DP
MINIABB_INT
USBH_DM
VCHG_VBUS
MINIABB_I2C_SDA
MINIABB_I2C_SCL
MAX_DM
MAX_DP
USB_ID
CHANGE 1115
Main Battery
TA