Charger Troubleshooting - LG E900 Service Manual

4. TROUBLE SHOOTING

4.11 Charger Troubleshooting

REV.1.0
CN400
6
7
VBUS 2mm
8
TA
1
VBUS (4.8V)
TA
D- 2
D+ 3
(4.8V)
ID 4
GND 5
9
10
C446
11
22p
GU077-5P-SD-E1500
ENRY0011501
Main
Battery
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
LGE Internal Use Only
FL400
NFM18PC104R1C3
1
IN
MAX_DM
GND1 GND2
MAX_DP
USB_ID
D405
ESD9B5_0ST5G
ISNS_P
+VPWR
ISNS_M
2mm
+VPWR
VBAT
C437 C439
22u 10n
Main 1608
Battery
Charging Current Flow
TA OVP Circuit
U404
2mm
1
OUT IN1
2
IN2
3
OVLO
REV.B
C447
C448
1u
22p
25V
VCHG_VBUS
Q400 NUS5530MN
10
DRAIN_B
1%
1 9
NC1 COLLECTOR_B
2 8
COLLECTOR EMITTER
3 7
SOURCE BASE
4 6
DRAIN NC2
5
GATE
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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Copyright © 2010 LG Electronics. Inc. All right reserved.
VCHG_VBUS
EUSY0374601
2mm
7
OUT1
8
OUT2
MAX14528
4
IC1
5
IC2
C445
1u
2mm
CHG_CTL_N
BATT_FET_N
Only for training and service purposes