LG GT540 - Charger Troubleshooting

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Only for training and service purposes
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4. Trouble Shooting
4.10 Charger Troubleshooting
Figure. Charging Current Flow
Charging Procedure
- Connect TA or u-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(NUS5530MIN)
- 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
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TP1
R408
0.1
Q400
5
64
73
82
91
10
DRAIN_B
NC1 COLLECTOR_B
COLLECTOR EMITTER
SOURCE BASE
DRAIN NC2
GATE
VBAT
+VPWR
VCHG_VBUS
10n
C409
C410
22u
ISNS_P
BATT_FET_N
CHG_CTL_N
+VPWR
ISNS_M
1%
2mm