Samsung SGH-X400, Service Manual

Page: 31 / 39

SAMSUNG Proprietary-Contents may change without notice
4- 20
SGH-X400 Flow Chart of Troubleshooting
This Document can not be used without Samsung's authorization
M
IC
R
O
S
T
R
IP
L
IN
E
L
9
0
1
3
.9
n
H
V
R
F
13
S
D
I
S
D
O
10 11
S
E
N
B
5
VD DD
V
D
D
I
28 25
V
D
D
R
XIN
7
9
P
D
N
B
20
RF LA
RF LB
19
RF LC
17
RF LD
16
23
R
F
L
O
N
R
F
L
O
P
24
S
C
L
K
12
29
G
N
D
G
N
D
30
3
IF LA
IF LB
2
IF
L
O
N
26 27
IF
L
O
P
N
C
8
N
C
14
31
G
N
D
G
N
D
32
GN D
4
GN D
6
15
GN D
18
GN D
21
GN D
G
N
D
22
U
9
0
3
1
GN D
C
9
0
6
3
3
P
F
2
2
N
F
VD D2
1
4
VD D3
3
2
VD D4
2
6
V
O
S
C
V
R
F
C
9
0
5
RF LO P
1
2
R
F
O
D
2
4
25
RF OG
6
T
X
IN
5
T
X
IP
T
X
Q
N
8 7
T
X
Q
P
2
3
V
D
D
1
3
1
PD NB
R
F
ID
N
2
0
1
9
R
F
ID
P
R
F
IG
N
2
2
2
1
R
F
IG
P
R
F
IP
N
1
8
R
F
IP
P
1
7
RF LO N
1
3
GN D
3
5
GN D
3
6
1
0
IF LO N
IF LO P
9
IO
N
1 2
IO
P
2
9
L1
L2
2
8
C
K
P
4
DIA G1
1
6
1
5
DIA G2
1
1
GN D
2
7
GN D
GN D
3
0
GN D
3
3
GN D
3
4
6
VD DC
7
XIN
1
9
XO UT
U
9
0
2
C
K
N
3
4
R
X
IP
3
R
X
Q
N
R
X
Q
P
2
1
7
SC LK
SD I
1
8
1
5
S
D
O
SE NB
1
6
VD DA
2
0
2
1
GN D
GN D
2
2
GN D
2
3
GN D
2
4
IO
N
1
2
1
1
IO
P
P
D
N
B
1
4
5
R
X
IN
1
0
CK N
CK P
9
1
G
N
D
8
GN D
1
3
G
N
D
U
9
0
1
V
O
S
C
V
O
S
C
V
O
S
C
V
R
F
C
9
0
4
4
7
P
F
V
R
F
V
O
S
C
C
9
0
8
1
0
0
P
F
2
2
N
F
C
9
0
9
2
2
N
F
C
9
1
1
C
9
1
0
1
0
0
P
F
S
E
R
L
E
S
E
R
C
L
K
S
Y
N
_
E
N
S
E
R
D
A
T
S
E
R
D
A
T
S
E
R
C
L
K
S
E
R
L
E
C
L
K
1
3
M
_
R
F
X
O
E
N
A
1
3
M
H
Z
_
B
B
S
I_
E
N
P
C
S
_
L
N
A
_
IN
_
P
P
C
S
_
L
N
A
_
IN
_
N
G
S
M
_
L
N
A
_
IN
_
P
G
S
M
_
L
N
A
_
IN
_
N
D
C
S
_
L
N
A
_
IN
_
P
D
C
S
_
L
N
A
_
IN
_
N
S
I_
E
N
R
X
IP
R
X
IN
R
X
Q
P
R
X
Q
N
T
X
IN
T
X
IP
T
X
Q
N
T
X
Q
P
G
S
M
_
P
A
M
_
I
N
D
P
C
S
_
P
A
M
_
I
N