LG GS290 - Charging Trouble

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Only for training and service purposes
4. TROUBLE SHOOTING
GS290 Operational Description Revision B
LG Electronics 67/136 LGE Property
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 : 4.0 V
3 Charging time : 2h 00m
4 Charging current : 645 mA
5 CV voltage : 4.2 V
6 Cutoff current : 105 mA
7 Full charge indication current (icon stop current) : 105 mA
8 Recharge voltage : 4.16 V
4.2V~3.74V 3.73V~3.65V 3.65V~3.59V 3.59V~3.35V
TP1
TP2
K3.3
6
02
R
BQ25040
U201
5 6
74
83
92
101
11
PGND
IN BAT
ISET _PG
VSS1 CHG
LDO VSS2
EN_SETIFULL
1u
C210
1u
C212
VIO_2V62
VIO_2V62
50
2
R
IND
C224
1u
VBATVIO_2V62
V_BUS
K00
1
3
2
2R
0
2
8
702R
K
0
0
1
4
2
2R
_CHG_EOC
_PPR
_CHG_EN
RPWRON_EN
Single Charging IC for uUSB
)%
1(
(645mA)
)%1
(
(105mA)
TP2
TP1