LG LG-P350 - Charging Trouble Shooting

4. TROUBLE SHOOTING
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Copyright © 2011 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
53
4
82
71
IN1 OUT1
IN2 OUT2
IC1
OVLO IC2
DNG DN
GP
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
64
73
82
91
10
DRAIN_B
NC1 COLLECTOR_B
COLLECTOR EMITTER
SOURCE BASE
DRAIN NC2
GATE
1.0
605R
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