Samsung SGH-E750, Service Manual

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Flow Chart of Troubleshooting
7-2
SI
M_
VC
C
SI
M_
C
L
K
SI
M_
R
S
T
Backu
p
_
Battery
DC/DC Down Conveter(1.8Volt)
SI
M_
IO
2.3T SIM
R
400
C
425
C
411
C
413
L
401
C
415
R
404
GN
D
2
MO
D
E
61
RUN
3
SW
VFB
5
VI
N
4
R
408
U401
+
V
DD_
IO
_
L
O
W
R
402
C
412
V
400
C
414
R
407
C
429
NE G
2
PO S
1
C
418
U4
04
C
424
L
400
C
419
C
430
C
416
C
426
C
403
C
427
R409 R
403
T
P
400
C
420
C
402
C
421
C
410
C
428
C
422
C
423
C4
0
5
L4
0
2
C
417
NC
9
10
NC
VC
C
1 2
RS
T
VC
C
5
5000-6P-2.
3
M
SI
M400
CL
K
3 4
GN
D
IO
6 7
NC NC
8
R
401
OSC400
2 1
44
_S IM RS HC
7
32
VIN T
29
VS AV E
30
_IR Q
10
_O NK EY
27
_R EC 1
1
_R
E
C
2
13
_R ST HC
11
_
S
IM
RS
CD
SIM CK HC
8
S
IM
D
3
V
BAT
40
SI
M
E
N
45
SI
M
IO
C
D
42
SIM IO HC
9
SI
M
V
C
C
41
VB AT
31
VC HG
28
RF
1
2
V
BAT
23 22
RF
1
V
DD
RF
2
V
DD
24
SC L
2
SC
N
38
SC
P
37
SD A
3
S
IM
CKCD
43
MIC BIA S
12
NC
53 54
NC
OS CI
26
OS CO
25
PW RE N1
6 PW RE N2
5
RE FC
48
GP
O2
47
GP
O3
46
18
HCV
BAT
HCV
DD
17
IO
D2
V
BAT
15 14
IOV
D
D
20
L
P
D1
V
BAT
L
PVD
D
19
D1
V
D
D
21 16
D2
V
D
D
D3
V
D
D
39
GN
D
49 50
GN
D
GN
D
51 52
GN
D
GP
O1
U405
CH GC UR /B AT MA X
34
CH GD RV
33
CL K3 2K
4
CP VB AT
36
CP VD D
35
C
404
V
BAT
+
V
DD_
G
S
M
_
CO
RE
RE
F
_
O
N
+
V
DD_
IO
_
L
O
W
IT
_P
M
U
O
NKE
Y
N
AUX
_
O
N
RS
T
O
N
SI
M
R
ST
+
V
DD_
RX
_
T
X
+
V
CC_
S
Y
N
+
V
DD_IO_HIGH
BU_
RS
T
32K
H
z
_D
IGIT
+
V
DD_
G
_
A
VD
D
_
SL
EEP
V
BAT
+
A
V
DD_
HF
A
+
V
DD_
IO
_
L
O
W
+A
V
D
D
M
IC_
BIAS
RE
F
_
O
N
PO
N
_
T
X
SC
L
SD
A
SI
M
C
L
K
SI
M
IO