Charging Trouble - LG KU950 Service Manual

4.18 Charging trouble

4.2~4.25V
• • Charging Procedure
- Connecting TA or USB Cable
- Control the charging current by PM6650-1M 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
USB_VBUS
Charging Current Flow
Q600
6 5 4
QST4
Pass control Tr
(ON)
Q600
1 2 3
USB_CNT_N
+5V_PWR
6 5 4 Q601
QST4
Pass control Tr
(ON)
Q601
1 2 3
CHG_CNT_N
ICHARGE
+VPWR
ICHARGEOUT
VBATT
Q602
Q602
SI3493DV-E3
Battery FET
BATT_FET_N
(ON)
- 129 -
4. TROUBLE SHOOTING
USB Cable
(5.0V)
USB Charging control
TA
(4.6V)
TA Charging control
Charging current
sensing
Main
Battery
Battery charging
control