Charging Trouble - LG 410G Service Manual

4.6 Charging Trouble

TEST POINT
Check Points
-Connection of TA (check TA voltage 5.6V)
-Charging Current Path component voltage drop
-Battery voltage
-Charging IC
WAVE FROM
CHARGING
U300
OFF
CIRCUIT
V_IO
EOC
CHG_EN
DNI
R305
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
CHARGING
ON
VCHG_IN
VBUS_IN
U300
1
VDC
2
VUSB
3
TP1
_PPR
4
_CHG
5
_EN
6
IMIN
-43-
- 47 -
4. TROUBLE SHOOTING
R305
TP1
VBAT
ISL9221
13
PGND
12
VDC_BYP
11
BAT
10
USB_BYP
9
IVDC
8
GND
7
IUSB
DNI
R307
U300
VCHG VBUS
C304 C305 C306
0.1uF 0.1uF 0.1uF
LGE Internal Use Only