Charger Troubleshooting - LG U970 Service Manual

4.10 Charger Troubleshooting

Charging Current Flow
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
Differential lines, route as equal length as possible !! --> ICHARGE , ICHARGEOUT
6 5 4
1 2 3
6 5 4
C1 C2 3 B
1 2
FDJ129P
Battery FET
Q402
- 99 -
4. TROUBLE SHOOTING
USB
Cabl
e
Q400
QST4
Rev.D
Pass
USB charging
Tr
USB_CNT_N
(ON)
TA
(4.8V)
Pass
Tr
CHG_CNT_N
(ON)
ICHARGE
ICHARGEOUT
+VPWR
Main
(ON)
Battery
C443
rev.1.2
0.1u
BATT_FET_N