Charger Troubleshooting - LG GM750 Service Manual

4.8 Charger Troubleshooting

C N 4 0 1
6
8
S I N
1 0
1 2
TA
S I N
1 4
(4.8V)
1
1 m m ( o t h t e W P - A M )
+ V P W R
2
2 m m ( o t h t e B a t t C . o n ) n
V B A T
TA
2 m m ( o t h t e S K Y 7 7 5 2 ) 1
3
u-USB
(4.8V)
4
Cable
5
7
u-USB
9
Cable
1 1
1 3
1 5
G U 0 7 3 5 - P S - D E -
E N R Y 0 0 0 8
( R e v e s r e T
( R e v e s r e T
R e . v 1
1 m m ( o t h t e W P - A M )
+ V P W
2 m m ( o t h t e B a t t C . o n ) n
V B A
2 m m ( o t h t e S K Y 7 7 5 2 ) 1
Charging Procedure
- Connect TA or u-USB Cable
- Control the charging current by PM7540 IC
- Charging current flows into the battery
Check Point
- Connection of TA or USB Cable
- Charging current path
- Battery
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
C 4 4 0 L 4 0 5
2 2 p 2 7 0 n
B t a e t y r C h a g r n i g i C c r
S _ P
Q 4 0 1 N U S 5 5 3 0 M N
+ V P W R
S _ M 1 0
2 m m
1 %
D R A N I _ B
1 9
N C 1 C O L L E C T O R _ B
2 8
C O L L E C T O R E M T I T E R
3 7
S O U R C E B A S E
4 6
D R A N I N C 2
M A X _ D M
5
G A T E
M A X _ D P
C 4 5 9 C 4 6 2
U S B _ D I
2 2 u 1 0 n
D 4 0 1
C 4 3 9
P R S B 6 8 . C
3 9 0 p
1 5 0 0
8 0 1
y p ) e
y p , e C T 8 1 , 0 E N R Y 0 0 0 8 5 0 ) 1
0 . 0 9 0 8 1 2
S I N S _ P
+ V P W R
S I N S _ M
R
T
Main
Battery
Main
Battery
Charging Current Flow
F M _ A N T
u t i
V C H G _ V B U S
T A O V P i C c r u t i
2 m m
C H G _ C T L _ N
N U S 3 0 6 5 M U T A G U 4 0 4
B A T T _ F E T _ N
9
D R A N I _ T H E R M A L
8 1
V C C N I
7 2
O U T G N D
6 3
G A T E C N T R L
5 4
S R C D R A N I
C 4 4 1
3 9 . n
Q 4 0 1 N
1 %
1
N C 1
2
C O L L E C T O
3
S O U R C E
4
D R A N I
C 4 5 9 C 4 6 2
1 0 n
2 2 u
Troubleshooting Setup
- Connect TA and battery to the phone
Troubleshooting Procedure
- Check the charger (TA or USB Cable) connector
- Check the OVP Circuit
- Check the charging current Path
- Check the battery
- 119 -
4. TROUBLE SHOOTING
V
2 m m
F L 4 0 1 N F M 1 8 P C 1 0 4 R 1 C 3
N I O U T
G N D 1 G N D 2
S F E Y 0 0 1 5 3 0 1
P S D 1 2 L - F
Z D 4 0 1
V C H G
U S 5 5 3 0 M N
1 0
D R A N I _ B
9
C O L L E C T O R _ B
8
R E M T I T E R
7
B A S E
6
N C 2
5
G A T E
LGE Internal Use Only
C H G _ V B U S
2 m m
_ V B U S
2 m m
C H G _ C T L _ N
B A T T _ F E T _ N