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4. TROUBLE SHOOTING
4.6 Charging Trouble
Check Points
-Connection of TA (check TA voltage 5.6V)
-Charging Current Path component voltage drop
-Battery voltage
-Charging IC
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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
CHARGING
OFF
CHARGING
ON
100K
R301
V_IO
33K
R306
5.6K
R303
16K
R304
R305
DNI
0.1uF
C306
5
_EN
_PPR
3
VCHG_IN
VBUS_IN
11
BAT
GND
8
IMIN
6
7
IUSB
9
IVDC
PGND
13
USB_BYP
10
1
VDC
12
VDC_BYP
VUSB
2
4
_CHG
U300
ISL9221
R307
DNI
VCHG
VBUS
C305
0.1uF
0.1uF
C304
VBAT
EOC
CHG_EN
TP1
R305
U300
TEST POINT
WAVE FROM
CIRCUIT
TP 1
Charging while
CHG_EN is low
Summary of Contents for KP151Q
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