Charging Trouble - LG KC780 Service Manual

5.3 Charging trouble

Check Points
-Connection of TA (check TA voltage 5.1V)
-Charging Current Path component voltage drop
-Battery voltage
1 Charging method : CC-CV
2 Charger detect voltage : 4.0 V
3 Charging time : 3h
4 Charging current : 450 mA
5 CV voltage : 4.2 V
6 Cutoff current : 100 mA
7 Full charge indication current (icon stop current) : 100 mA
8 Recharge voltage : 4.15 V
4.2V~3.76V
TP1
VCHG
C303
2.2u
FL302
OUT IN
GND2 GND1
ICVFP10181E301FR
FL305 FL306
EVSC5S04F050 EVSC5S04F050
P6 P6
6 6
P3 3 P3 3
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.75V~3.68V
C304
24p
VBAT
CN302
19
1
2
3
2 : Headset MIC
FB304
4
FB305
5
4 : HSO_L
FB306 10 6
5 : HSO_R
FB307 10 7
6 : USB+
8
7 : USB-
9
8 : JACK_D
10
9,10 : BATT
11
12
11 : R/ON
13
14 12,13 : CHG
15
14 : DSR
16
15 : VUSB
17
16 : D/ TX
18
FL307
17 : D/ RX
EVSC5S04F050
20
P6
6
P3 3
3.65V~3.41V
KDR331V
FM_ANT
3
C109
VRTC_2V0
C120 0.1u
T
C127
- 75 -
5. TROUBLE SHOOTING
3.51V~3.41V
TP2
OVP_VCHG
2
OVP_VUSB
1
D101
220n
LGE Internal Use Only