Charger Troubleshooting - LG U370 Service Manual

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4. TROUBLE SHOOTING

4.9 Charger Troubleshooting

USB_VBUS
ICHARGE
ICHARGEOUT
+VPWR
Charging Procedure
- Connect TA or USB Cable
- Control the charging current by PM6650 IC
- Charging current flows into the battery
Troubleshooting Setup
- Connect TA and battery to the phone
Check Point
- Connection of TA or USB Cable
- Charging current path
- Battery
Troubleshooting Procedure
- Check the charger (TA or USB Cable) connector
- Check the charging current Path
- Check the battery
LGE Internal Use Only
Battery Charging Circuit
10
VBATT
1
+5V_PWR
2
3
4
U304
9
P_DRAIN
P_COLLECTOR
8
EMITTER1
BASE1
7
EMITTER2
BASE2
6
COLLECTOR
GATE
5
SOURCE
DRAIN
NUS3116MTR2G
Copyright © 2007 LG Electronics. Inc. All right reserved.
- 90 -
CHG_CTL_N
USB_CTL_N
BATT_FET_N
VBATT
Only for training and service purposes

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