LG GB220 - Charging Trouble

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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
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4.5 Charging Trouble
TEST POINT
CIRCUIT
Figure 4.5
CN300
U300
(1608)
(080714)
(1%)
(1%)
Change to withstanding voltage from 6.3V to 25V
Change to withstanding voltage from 6.3V to 10V
(1608)
(080714)
OVP CHARGING IC
200K R319
1V81_VDD
ISL9221
EUSY0351601
U300
11
BAT
GND
8
IMIN
6
7
IUSB
9
IVDC
PGND
13
USB_BYP
10
1
VDC
12
VDC_BYP
VUSB
2
4
_CHG
5
_EN
_PPR
3
C308
1u
C311
1u
20K
R308
VBAT
C309
1u
VBUS_OVP
100K R307
C312
1u
VCHG_OVP
VBUS_USB
100K R320
R303
6.8K
1u
C310
R304
16K
VCHG
EOC
CHG_EN