Table of Contents
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SGH-E770 Flow Chart of Troubleshooting
R16
C112
C116
R19
C122
R110
C124
C130
C133
DCS74945_OUT
R113
GSM74945_OUT
R127
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VCCB_2.9V
VPAC_2.8V
L102
C14
R13
C110
C111
C113
C155 C 152
C114
20
XTAL_TUNE
25
UHF_TUNE
18
UHF_CPO
24
UHF_BYP
35
TX_TUNE
46
RTXQN
TX_Q-
4
RTXQP
TX_Q+
45
RTXIN
TX_I-
58
RTXIP
TX_I+
37
TX_EN
TX_EN
40
TX_CPO
34
TX_1800_OUT
33
TX_900_OUT
17
CLK13M_RF
SYN_REF
50
SX_EN
SX_EN
28
RX_Q-
29
RX_Q+
30
RX_I-
54
RX_I+
36
RX_EN
RX_EN
12
LPF_ADJ
53
LO-
52
LO+
R112
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VCCD_2.9V
VRF_2.9V
GSM_OUT
DPCS_OUT
DCS_TX_EN
GSM_TX_EN
C15
C154
C17
C18
C19
C115
100nF
1
LNA1900
43
LNA1800
42
LNA900
6
EDGE_REF-
IF_REF-
5
IF_REF+
EDGE_REF+
41
EDGE_LO
LO
2
EDGE_IF-
IF_OUT-
3
EDGE_IF+
IF_OUT+
22
SERLE
LE
51
SERDAT
DATA
13
UCD100
CLK_BUFF_OUT
21
SERCLK
CLK
57
BS2
10
CAP_Q-
C131
48
CAP_Q+
9
CAP_I-
C132
8
CAP_I+
56
BAND_SEL
BANDSEL
11
26MHZ_PAD
6
ANT
2
EGSM_TX
PCSRX 11
17
DCSRX 13
DPCSTX
F100
15
16 VC2
EGSMRX
4
VC1
1
3 5 7 8 9 101214
18
1920212223
24
C16
L103
L104
L105
C119
C123
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