LG KS20 Operating Instructions Manual page 114

4. TROUBLE SHOOTING
C314
VUSB_5.0V
VCHG_5.0V
R309 10
1u
C320
LGE Internal Use Only
[ USB part 1 ( Main PCB) ]
C314
2.2u
VBAT
VCHG_5.0V
VUSB_5.0V
ISNS_P
ISNS_M
VPWR
[ USB part 2 ( Main PCB ) ]
- 116 -
Battery Charging Circuit
U300 NUS3116MTR2G
10
P_DRAIN P_COLLECTOR
1
EMITTER1 BASE1
2
EMITTER2 BASE2
3
COLLECTOR GATE
4
SOURCE DRAIN
C305
C304
0.01u
22u
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
9
8
CHG_CTL_N
7
USB_CTL_N
6
BAT_FET_N
5
VBAT