4.11 Charger Troubleshooting
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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Charging Current Flow
Main
Battery
TA
(4.8V)
CN400
ENRY0011501
GU077-5P-SD-E1500
11
10
9
5
4
3
2
1
8
7
6
VBUS
D-
D+
ID
GND
MAX14528
EUSY0374601
U404
9
6
5
3
4
8
2
7
1
IN1
OUT1
IN2
OUT2
IC1
OVLO
IC2
D
N
G
D
N
G
P
C445
1u
VCHG_VBUS
C446
22p
22p
C447
FL-
21
D
S
P
10
4
DZ
FL400
NFM18PC104R1C3
1
IN
OUT
GND1 GND2
ESD9B5_0ST5G
D405
C448
1u
MAX_DP
MAX_DM
USB_ID
REV.B
25V
REV.1.0
2mm
2mm
TA OVP Circuit
VBUS 2mm
- 108 -
LGE Internal Use Only
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
22u
C437
10n
C439
VCHG_VBUS
+VPWR
VBAT
NUS5530MN
Q400
5
6
4
7
3
8
2
9
1
10
DRAIN_B
NC1
COLLECTOR_B
COLLECTOR
EMITTER
SOURCE
BASE
DRAIN
NC2
GATE
70
4
R
1.
0
+VPWR
ISNS_P
BATT_FET_N
CHG_CTL_N
1608
2mm
2mm
1%
ISNS_M
TA
(4.8V)
Main
Battery
Содержание E900
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