Charger Trouble Shooting - LG U890 Service Manual

4.19 Charger Trouble Shooting

4.2~4.25V
Charging Procedure
- Connecting TA or USB Cable
- Control the charging current by PM6050 IC using USB_CNT_N or CHG_CNT_N signal
- Charging Current flows into the battery by control BATT_FET_N
Check Point
- Connection of TA or USB Cable
- Charging current path
- Battery
Trouble Shooting Setup
- Connect TA or USB Cable and battery to the phone
Trouble Shooting Procedure
- Check the charger connector
- Check the charging current Path
- Check the battery
Charging Current Flow
USB_VBUS
6 5 4
Pass control Tr
(ON)
3 B
C1 C2
1 2
USB_CNT_N
+5V_PWR
6 5 4
Pass control Tr
(ON)
B
C1 C2 3
1 2
CHG_CNT_N
ICHARGE
ICHARGEOUT
+VPWR
VBATT
Battery FET
(ON)
BATT_FET_N
- 117 -
4. TROUBLE SHOOTING
USB Cable
(5.0V)
USB Charging control
TA
(4.6V)
TA Charging control
Charging current
sensing
Main
Battery
Battery charging
control