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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
– Charging Procedure
• Connecting TA & Charger Detection
• Control the charging Current by CHARGER IC
• Charging Current flow into the Battery
–Check Points
• Connection of TA
•Charger IC
•Battery
– Trouble Shooting Setup
• Connect Battery & TA to the handset
– Trouble Shooting Procedure
• Check the charger connector
• Check the charging current path
• Check the battery
4.4.4 Charging Current
TA
USB
CHG_EN
ISL9221
Battery
Charger power
USB power
B
S
U
_
SUB
V
G
H
C
_
5
N
E_
R
P
P_
3
1
22
9
L
SI0
0
2
U
1
1
TA
B
D
N
G
8
NIM
I
6
7
B
SUI
9
C
D
VI
DN
G
P
3
1
P
Y
B_BS
U
0
1
1
CD
V
2
1
P
YB
_CDV
B
SU
V
2
4
OI
V_
8
V
1
OI
V
_
8
V1
G
HC
V
u1
302C
P
VO_GHC
V
3
12R
K
2
.
6
202
R
K0
1
P
V
O
_SU
B
V
u0
1
00
2
C
K0
0
1
2
12
R
TABV
K
8
1
512R102C
u
0
1
K
0
1
1
0
2
R
u
1
4
0
2C
K
8
1
4
1
2
R
TED_N
I_RW
P
_
CO
E
N
E
_
G
HC
_
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