Charging Trouble - LG KS10 Service Manual

4. TROUBLE SHOOTING

4.14 Charging trouble

Route as equal length as possible! -> ICHARGE, ICHARGEOUT
Main
Battery
• 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
LGE Internal Use Only
Charging Current Flow
4.2~4.25V
Charging current
sensing
Q700
ICHARGE
2012
1%
ICHARGEOUT
Q701
+VPWR
VBATT
Q602
Battery charging circuit !!!!!
- 124 -
USB_VBUS
USB Charging control
Q700
6 5 4
QST4
Pass control Tr
1 2 3
(ON)
USB_CTL_N
Q701 NUS5530MN
10
Drain_B
1 9
NC1 Collector_B
2 8
Collector Emitter +5V_PWR
3 7
Source Base CHG_CNT_N
4 6
Drain NC2
5
Gate BATT_FET_N
Battery FET
Pass control Tr
(ON)
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Only for training and service purposes
USB Cable
(5.0V)
TA Charging
control
TA
(4.6V)
(ON)
Battery charging
control