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
ZD4001
VA4000
DNI
1u
C4002
FL4001
5
6
3
1
4
2
P2
P4
P1
P3
P6
P5
VBUS_CHG_IN
22p
C4003
22p
C4001
FL4000
1
IN
OUT
GND1 GND2
CN4000
11
10
9
5
4
3
2
1
8
7
6
USB_ID
MINIABB_DP
MINIABB_DM
2mm
VBUS 2mm
u-USB Connector
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
C4005
1u
R4002
4.7K
VREG_MSME_1.8V
TP4000
1u
C4006
1u
C4000
R4001
4.7K
R4003
10
K
U4000
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
VBAT
UART_TX
UART_RX
USBH_DP
VREG_MSME_1.8V
MINIABB_INT
GND
MINIABB_I2C_SCL
MINIABB_I2C_SDA
VBUS_CHG_IN
USBH_DM
VCHG_VBUS
USB_ID
MINIABB_DP
MINIABB_DM
Mini ABB_NS
TA (5.1V, 700mA)
TA
Main Battery