Charging Trouble Shooting - LG -E425 Service Manual

4.11 Charging Trouble Shooting

CN4000
10 8
1
6 2
3
7 4
5
11 9
VCHG_VBUS
C4000
1u
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, 700mA)
VBUS 2mm
FL4001
VA4000
2
P2
1
P1
CHARGING IC
TA
VBUS_CHG_IN
1
IN
2
U4000
ISET
3
VSS1
4
LDO
5
IFULL
700mA 100mA
USB_ID
4
P4
3
P3
Main Battery
VREG_MSME_1.8V
VBAT
11
PGND
10
BAT
9
_PG
8
CHG
7
VSS2
6
EN_SET
C4006
1u
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
- 69 - Copyright © 2013 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
VBUS_CHG_IN
2mm
FL4000
1
IN OUT
GND1 GND2
USBH_DM
USBH_DP
EOC
CHG_EN
Only for training and service purposes