Charging Trouble - LG KP105 Service Manual

4.14 Charging Trouble

TEST POINT
Check Points
- Connection of TA (check TA voltage 4.8 ~ 6.4V)
- Charging Current Path component voltage drop
- Battery voltage
- Charging IC
CIRCUIT
CHARGE_DETECT
CHG_EN
TP5
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
VCHARGE
R119
470K
R120 1.8K
R121 47
R125 R126
100K 100K
TP2
4. TROUBLE SHOOTING
TP4
TP1
U102 MP26021
1 IN 10
BATT
2 9
_CHG ISET
3 _ACOK IBF 8
4 SS 7
_EN
5 NTC 6
GND
C129
2.2u
(25V,K,Y5V)
(2012)
- 77 -
TP5
Charger
IC
U102
VBAT
VCHARGE
=4.8~6.4V
TP3
CN301
VBAT
TP3
C128
R123
620 4.7u
(1608)
C130
R127 R128
20K 3.9K
0.1u
(1%) (1%)
(85mA) (400mA)
LGE Internal Use Only
TP2
TP1
TP4