Charger Troubleshooting - LG L704I Service Manual

4. TROUBLE SHOOTING

4.7. Charger Troubleshooting

4.2~4.25V
Charging Procedure
- Connect TA
- Control the charging current by PM6650 IC
- Charging current flows into the battery
Charging
- Connection of TA
- Charging current path
- Battery
LGE Internal Use Only
Charging Current Flow
Pass
Tr
(ON)
6 5
1 2
(1%)
Q8
C1661
FDJ129P
33u
EQFP0005101
2012
Battery FET
(ON)
TA
+5V_PWR
(5.4V)
Q1
4
QST4
EQBP0009901
3
CHG_CNT_N
ICHARGE
ICHARGEOUT
+VPWR
33p C1618
Main
VBATT
Battery
4.2~4.25V
BATT_FET_N
Troubleshooting Setup
- Connect TA and battery to the phone
Troubleshooting Procedure
- Check the charger connector
- Check the charging current Path
- Check the battery
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Only for training and service purposes