4. TROUBLE SHOOTING
- 113 -
Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4.11 Charging Trouble shooting
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
MAX14528
U503
EUSY0374601
9
6
5
3
4
8
2
7
1
IN1
OUT1
IN2
OUT2
IC1
OVLO
IC2
D
N
G
D
N
G
P
22p
C561
C562
1u
SC500
1
CN501
11
10
9
5
4
3
2
1
8
7
6
ZD502
VCHG_VBUS
22p
C564
FL500
IN
OUT
GND1 GND2
USB_ID
USB_DM
USB_DP
OVP
change circuit at REV B
MicroUSB
2mm
C531
100u
C532
10n
VCHG_VBUS
VBATT
Q500 NUS5530MN
EQFP0008601
5
6
4
7
3
8
2
9
1
10
DRAIN_B
NC1
COLLECTOR_B
COLLECTOR
EMITTER
SOURCE
BASE
DRAIN
NC2
GATE
1.
0
60
5
R
CHG_CTL_N
BATT_FET_N
ISNS_P
+VPWR
2mm
1608
Charging IC
10V
2mm
1%
ISNS_M
TA
(5.1V)
Main
Battery
Charging Current Flow