LG KU950 - Charging Trouble

4. TROUBLE SHOOTING
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4.18 Charging trouble
••
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
2012
D1 D2 D3 D4
G
S
Q602
SI3493DV-E3
312
564
+5V_PWR
QST4
Q601
2
564
Q600
QST4
31
R611 0.1
VBATT
+VPWR
USB_VBUS
USB_CNT_N
CHG_CNT_N
ICHARGE
ICHARGEOUT
BATT_FET_N
Pass control Tr
(ON)
4.2~4.25V
Main
Battery
TA
(4.6V)
Battery FET
(ON)
Charging Current Flow
Pass control Tr
(ON)
USB Cable
(5.0V)
USB Charging control
TA Charging control
Charging current
sensing
Battery charging
control
Q600
Q601
Q602