LG KB770 Service Manual page 105

4. TROUBLE SHOOTING
CHARGING IC
CHARGING IC
VBATT
TA (5.1V)
+5V_PWR
USB(5.0V)
USB_VBUS
ICHARGE
ICHARGEOUT
+VPWR
LGE Internal Use Only
Charging Current Flow
U504
10
P_DRAIN
1
EMITTER1
2
EMITTER2
3
0.1 COLLECTOR
4
R519
SOURCE
[ Charging part ( MAIN Bottom ) ]
- 106 -
NUS3116MTR2G
9
P_COLLECTOR
8
BASE1
7
BASE2
6
GATE
5
DRAIN
4.2~4.25V
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Pass Tr
CHG_CNT_N
(ON)
USB_CTL_N
Battery FET
BATT_FET_N
(ON)
VBATT
Main
Battery
R519
U504