LG KP105 - Charging Trouble

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Only for training and service purposes
4. TROUBLE SHOOTING
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4.14 Charging Trouble
Check Points
- Connection of TA (check TA voltage 4.8 ~ 6.4V)
- Charging Current Path component voltage drop
- Battery voltage
- Charging IC
TEST POINT
CIRCUIT
(1%)
(85mA)
(25V,K,Y5V)
(2012)
(1%)
(400mA)
(1608)
C129
2.2u
620
R123
47R121
R119
470K
VCHARGE
3.9K
R128
4.7u
C128
VBAT
U102 MP26021
10
BATT
6
GND
IBF
8
1
IN
9
ISET
5
NTC
PGND
11
SS
7
3
_ACOK
_CHG
2
_EN
4
1.8KR120
R125
100K
20K
R127
R126
100K
0.1u
C130
CHG_EN
CHARGE_DETECT
Charger
IC
U102
CN301
VCHARGE
=4.8~6.4V
VBAT
TP1
TP2
TP3TP4
TP5
TP5
TP2
TP1
TP3
TP4