Charging Trouble - LG KP500 Service Manual

5.3 Charging trouble

Check Points
- Connection of TA (check TA voltage 5.1V)
- Charging Current Path component voltage drop
- Battery voltage
1 Charging method : CC-CV
2 Charger detect voltage : 4.0 V
3 Charging time : 2h 20m
4 Charging current : 550 mA
5 CV voltage : 4.2 V
6 Cutoff current : 110 mA
7 Full charge indication current (icon stop current) : 110 mA
8 Recharge voltage : 4.16 V
4.2V~3.71V
VIO_2V62
4 R 7 2
0 1 K 0
P _ R P
C H G E _ O C
C H _ G N E
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.70V~3.55V
OVP Charging IC
TP1
VBUS_USB
VCHG
U401
4 R 6 2
1
VDC
0 1 K 0
2
VUSB
TP400
3
_PPR
4
_CHG
TP401
5
_EN
6
IMIN
ISL9221
4 R 0 3 4 R 1 3
4 C 9 3
EUSY0351601
u 1
0 1 K 0 . 5 K 6
1 ( ) %
- 73 -
5. Trouble shooting
3.54V~3.46V
VBAT
TP2
13
PGND
12
VDC_BYP
11
BAT
10
USB_BYP
9
IVDC
8
GND
7
IUSB
4 R 3 3 4 R 4 3 4 R 2 3
2 K 0 D I N 1 K 5
1 ( ) %
4 R 2 3 1 K 5 h o m 4 : 0 5 m A
3.45V~3.31V
VBUS_OVP
VCHG_OVP
4 C 0 4 4 C 1 4 4 C 2 4
0 1 . F u 0 1 . F u 0 1 . F u
LGE Internal Use Only