Charger Troubleshooting - LG TU550 Service Manual

4.8 Charger Troubleshooting

4.2~4.25V
Charging Procedure
- Connect TA
- Control the charging current by PM6650 IC
- Charging current flows into the battery
Check Point
- Connection of TA
- Charging current path
- Battery
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Only for training and service purposes
Charging Current Flow
Pass
Tr
(ON)
6 5 4 Q400
QST4
1 2 3
R300
Route as equal length as possible !! --> ICHARGE , ICHARGEOUT
0.1
Q401
SI3493DV-E3
Battery FET
(ON)
BATT_FET_N
R301
100K
Battery charging circuit !!!!!
4. TROUBLE SHOOTING
TA
(4.6V)
CHG_CNT_N
ICHARGE
ICHARGEOUT
+VPWR
Main
Battery
Troubleshooting Setup
- Connect TA and battery to the phone
Troubleshooting Procedure
- Check the charger connector
- Check the charging current Path
- Check the battery
- 95 -
LGE Internal Use Only