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R105
R106
C116
C117
C122
R110
C127
R111
RTX_QN
RTX_QP
C129
RTX_IN
RTX_IP
TX_EN
C130
C133
DCS74945_OUT
R113
GSM74945_OUT
R119
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VCCB_2.9V
VRF_2.8V
VCCD_2.9V
L105
C106
C114 C115
C152
C121
C118
20
XTAL_TUNE
25
UHF_TUNE
18
UHF_CPO
24
UHF_BYP
35
TX_TUNE
46
TX_Q-
4
TX_Q+
45
TX_I-
58
TX_I+
37
TX_EN
40
TX_CPO
34
TX_1800_OUT
U106
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
R112
LO+
10-21
Flow Chart of Troubleshooting
VRF_2.8V
GSM_OUT
DPCS_OUT
DCS_TX_EN
GSM_TX_EN
C107
C108
C109
C110
C111
C112
L106
L107
C120
L108
1
LNA1900
43
LNA1800
42
LNA900
6
IF_REF-
EDGE_REF-
5
IF_REF+
EDGE_REF+
41
LO
EDGE_LO
2
EDGE_IF-
IF_OUT-
3
IF_OUT+
EDGE_IF+
22
SERLE
LE
51
SERDAT
DATA
13
CLK_BUFF_OUT
21
SERCLK
CLK
57
CHIP_EN
BS2
10
CAP_Q-
C131
48
CAP_Q+
9
CAP_I-
C132
8
CAP_I+
56
BAND_SEL
BANDSEL
11
26MHZ_PAD
C101
L103
U100
6
ANT
2 EGSM_TX
PCSRX
11
17 DPCSTX
13
DCSRX
15
16
VC2
EGSMRX
4
VC1
1
3 5 7 8
910121418
1920
21222324
FEM5440TSC
C125
C126
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