LG KS20 - Charger Troubleshooting

LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4.11 Charger Troubleshooting
TA OVP Circuit
8
VCC
NUS3065MUTAG U302
CNTRL
3
4
DRAIN
DRAIN_THERMAL
9
GATE
6
GND
2
IN
1
7
OUT
5
SRC
C313
1u
NFM21PC105B1A3
FL300
3
G1 G2
4
IN
1
OUT
2
VADP_5.0V
VCHG_5.0V
Battery Charging Circuit
VUSB_5.0V
0.01u
C305
D302 PG05DBTFC
C304
22u
PG05DBTFCD303
VBAT
VPWR
NUS3116MTR2GU300
BASE1
8
BASE2
7
3
COLLECTOR
DRAIN
5
1
EMITTER1
EMITTER2
2
6
GATE
9
P_COLLECTORP_DRAIN
10
SOURCE
4
D301 PG05DBTFC
VBAT
0.1
R304
VCHG_5.0V
BAT_FET_NISNS_P
ISNS_M
CHG_CTL_N
USB_CTL_N
Charging Procedure
- Connect TA or USB Cable
- Control the charging current by PM7540 IC
- Charging current flows into the battery
Check Point
- Connection of TA or USB Cable
- Charging current path
- Battery
Troubleshooting Setup
- Connect TA and battery to the phone
Troubleshooting Procedure
- Check the charger (TA or USB Cable)
connector
- Check the OVP Circuit
- Check the charging current Path
- Check the battery
TA
(4.8V)
USB
Cable
Charging
Current Flow
Main
Battery
Pass Tr
(ON)
Battery FET
(ON)
Pass Tr
(ON)