Samsung SGH-E770 - Page 21

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SGH-E770 Flow Chart of Troubleshooting
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2-17
R112
G
G
18
PCSRX
11
VC1
4
16
VC2
243
G
5
G
G
78
G
G
91 0
G
G
1214
EGSMRX
EGSM_TX
2
1
G
19
G
G
2021
G
G
2223
G
G
F100
ANT
6
DCSRX
13
DPCSTX
17
15
C19
VPAC_2.8V
C130
R110
VCCD_2.9V
R19
VRF_2.9V
C114
C132
C112
C122
C110
C131
C111
C124
C119 C123
C17 C18
C115
100nF
C154
0
6
D
N
G
1
6
D
N
G
2
6
D
N
G
3
6
D
N
G
4
6
D
N
G
7
B
B
_
X
I
M
_
2
C
C
V
8
CAP_I+
9
CAP_I-
53
LO-
54
RX_I+
5
5
C
N
56
BANDSEL
57
BS2
58
TX_I+
9
5
D
N
G
6
EDGE_REF-
46
TX_Q-
7
4
D
N
G
48
CAP_Q+
9
4
C
N
5
EDGE_REF+
50
SX_EN
51
DATA
52
LO+
9
3
A
N
L
_
C
C
V
4
TX_Q+
40
TX_CPO
41
EDGE_LO
42
LNA900
43
LNA1800
4
4
D
N
G
45
TX_I-
1
3
B
B
_
C
C
V
2
3
O
C
V
_
X
T
_
C
C
V
33
TX_900_OUT
34
TX_1800_OUT
35
TX_TUNE
36
RX_EN
37
TX_EN
8
3
V
R
D
_
C
C
V
24
UHF_BYP
25
UHF_TUNE
6
2
F
H
U
_
C
C
V
7
2
O
L
_
C
C
V
28
RX_Q-
29
RX_Q+
3
EDGE_IF+
30
RX_I-
17
SYN_REF
18
UHF_CPO
9
1
N
F
_
C
C
V
2
EDGE_IF-
20
XTAL_TUNE
21
CLK
22
LE
3
2
D
D
V
1
LNA1900
10
CAP_Q-
11
26MHZ_PAD
12
LPF_ADJ
13
CLK_BUFF_OUT
4
1
D
N
G
5
1
D
C
C
V
6
1
P
F
_
C
C
V
UCD100
C113
L105
C15 C16
L104
L103
C133
C155C152
C14
L102
R13
R16
R127
C116
VCCB_2.9V
R113
DPCS_OUT
GSM_OUT
RX_EN
SX_EN
DCS74945_OUT
GSM74945_OUT
IF_OUT+
IF_OUT-
GSM_TX_EN
DCS_TX_EN
IF_REF+
IF_REF-
RTXIN
RTXIP
TX_EN
LO
SERDAT
BAND_SEL
CLK13M_RF
SERCLK
SERLE
RTXQN
RTXQP