Charging Trouble Shooting - LG E475F Service Manual

3.11 Charging Trouble Shooting

CN4000
10 8
1
6 2
3
7 4
5
11 9
VREG_PROX_3.0V
CAM_AVDD_2.8V
CAM_DVDD_1.2V
CAM_IOVDD_1.8V
1. Charging Procedure
- Connect TA or u-USB Cable
- Control the charging current by BQ25040 IC
- Charging current flows into the battery
2. Check Point
- Connection of TA or USB Cable
- Charging IC (BQ25040)
- Battery
LGE Internal Use Only
u-USB Connector
TA (5.1V, 600mA)
VBUS 2mm
FL4001
1
C4003
2
Mini ABB_NS
C4074 C4075 C4076 C4077
TA
VBUS_CHG_IN
1u 1u 1u 2.2u
23
VBUS1
24
VBUS2
22
MINIABB_DM D-
21
MINIABB_DP D+
20
USB_ID
UID
19
RES
18
CAP
C4006
1u
USB_ID
5
ZD4003 ZD4004
4
ZD4001
DNI DNI
MINIABB_DM
MINIABB_DP
TP1
Main Battery
VBAT
3
VIN
25
VBAT1
26
VBAT2
27
EXPDET
U1
11
RT8966AGQW
DN
12
DP
13
U1
14
U2
15
VREG_MSME_1.8V
AUD1
16
AUD2
17
MIC
32
DSS
GND
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
- 62 - Copyright © 2013 LG Electronics. Inc. All right reserved.
3. TROUBLE SHOOTING
VBUS_CHG_IN
2mm
FL4000
1
IN OUT
GND1 GND2
MLED[4]
MLED[3]
MLED[2]
MLED[1]
VCHG_VBUS
USBH_DM
USBH_DP
VREG_MSME_1.8V
R4002
R4001
4.7K
4.7K
MINIABB_I2C_SDA
MINIABB_I2C_SCL
MINIABB_INT
Only for training and service purposes