Charging Trouble - LG KF350 Service Manual

4. TROUBLE SHOOTING

4.3 Charging trouble

Check Points
-Connection of TA (check TA voltage 4.8V)
-Charging Current Path component voltage drop
-Battery voltage
1 Charging method : CC-CV
2 Charger detect voltage : 4.0 V
3 Charging time : 2h 40m
4 Charging current : 380 mA
5 CV voltage : 4.2 V
6 Cutoff current : 110 mA
7 Full charge indication current (icon stop current) : 110 mA
8 Recharge voltage : 4.16 V
4.2V~3.69V
2V62_VIO
_EOC
CHG_EN
R222
100K
LGE Internal Use Only
3.69V~3.53V
2V62_VIO VUSB_USB
VCHG
TP1
_PPR C257
1u
3.53V~3.43V
U204 ISL9221
13
PGND
1
VDC
12
VDC_BYP
2
VUSB
11
BAT
3
_PPR
10
USB_BYP
4
_CHG
9
IVDC
5
_EN
8
GND
6
IMIN
7
IUSB
R223
10K
(1%)
Copyright © 2008 LG Electronics. Inc. All right reserved.
- 68 -
3.43V~3.35V
VBAT
OVP_VCHG
TP2
OVP_VUSB
R225 R224
C256
18K 16K
1u
(1%) (1%)
Only for training and service purposes