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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
-43-
4.6 Charging Trouble
TEST POINT
CIRCUIT
Check Points
-Connection of TA (check TA voltage 5.6V)
-Charging Current Path component voltage drop
-Battery voltage
-Charging IC
U300
TP1
WAVE FROM
CHARGING
OFF
CHARGING
ON
R305
U300
R307
DNI
DNI
R305
0.1uF
C305
VCHG
VBUS
V_IO
R306
33K
R301
100K
R303
5.6K
3
_PPR
VCHG_IN
VBUS_IN
ISL9221
U300
BAT
11
8
GND
6
IMIN
IUSB
7
IVDC
9
13
PGND
10
USB_BYP
VDC
1
VDC_BYP
12
2
VUSB
_CHG
4
_EN
5
C306
0.1uF
R304
16K
C304
0.1uF
VBAT
CHG_EN
EOC
TP1