Charging Trouble - LG GX500 Service Manual

4. TROUBLE SHOOTING
GX500 Operational Description

4.3 Charging trouble

Check Points
-Connection of TA (check TA voltage 4.8V)
-Charging Current Path component voltage drop
-Battery voltage
1 Charging method : CC-CV
2 Charger detect voltage : 4.8 V
3 Charging time : 3h 15m
4 Charging current : 680 mA
5 CV voltage : 4.2 V
6 Cutoff current : 120 mA
7 Full charge indication current (icon stop current) : 120 mA
8 Recharge voltage : 4.16 V
4.2V~3.75V 3.75V~3.65V
RPWRON_EN
Figure 4-6. Charging circuit
LGE Internal Use Only
LG Electronics
3.65V~3.58V
SINGLE CHARGING IC
TP1
V_BUS
TP1
1
IN
2
ISET
3
VSS1
4
LDO
5
IFULL
C338 C337
1uF 1uF
560 ohm->(910mA) 2K(10%)->91mA
780 ohm->(680mA)
820 ohm->(646mA)
- 78 -
78/143
3.58V~3.30V
VBAT 2V62_VIO
TP2
TP2
11
PGND
10
BAT
9
U310
_PG
BQ25040
8
CHG
7
VSS2
6
EN_SET
C336
1uF
Copyright © 2010 LG Electronics. Inc. All right reserved.
Revision A
2V62_VIO 2V62_VIO
_PPR
_EOC
_CHG_EN
Only for training and service purposes
LGE Property