LG LG-E400 - Charging Trouble Shooting

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
FL401
5
6
31
42
P2 P4
P1 P3
6P
5P
VBUS_CHG_IN
C465
1u
22p
C404
p22204C
FL400
1
IN OUT
GND1 GND2
CN400
11
10
9
5
4
3
2
1
8
7
6
VA400
ZD400
USB_ID
MINIABB_DP
MINIABB_DM
2mm
VBUS 2mm
u-USB Connector
TA (5.1V, 700mA)
6
0
4C
u
1
VREG_MSME_1.8V
C401
1u
TP400
1u
C407
u
1
004C
10
4
R
K7.4
304R
K0
1
U400
C5
D2
B5
D3
D1
E1
E2
E3
E5
E4
A1
C1
B1
A4
A5
A3
A2
D5
4D
4C
3C
2C
2B
3B
4B
L
C
S
ADS
¬¡TNI
1
DN
G
2DNG
3DNG 4DNG
BATT2
DN
DP
U1
U2
AUD1
AUD2
MIC
VBUS1
VBUS2
D-
D+
ID
RES
DSS
EXPDET
CAP
BATT1
20
4
R
K7.4
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 Main Battery