Samsung SGH-A737 Service Manual page 69

U101
1
GND
2 12
RF3 CTLB
UMTS_850
3 11
C105 GND GND
4 10
GND CTLA
5 9
RF1 GND
6
RF2 8
GND
7
GND
UMTS_1900
C108
C109
R107
R108 R109
R110 1
GSM850_GSM900_TX
R111 R112
R113
GSM_PA_PWR_CTL
C112
VREG_SYNT_2.65V VREG_RFTX_2.65V
NC
U610
L128
R161
0
R159
L126
C136 L125
C137
RTR6275_TCXO
VREG_SYNT_2.65V
C140
ANT101
RFS100
BOTHHOLE
L129
L130
C194 C195
R160
6 1
VCC NC
VREG_RF_SMPS
5 A 2
NC
GSM_ANT_SEL3_N
4 Y GND 3
C106
U100
GSM_ANT_SEL3_N
C107
VBATT
C102 C103 C104
GSM_ANT_SEL1_N
GSM_ANT_SEL0_N
F101
C110
OUT
5
IN
VC
7
G G G G G
2 3 4 6 8
R114
GSM_SAW_SW_MODE
R121
TX_Q_N
C131
C132
R122
TX_Q_P
TX_AGC_ADJ
C138
1
GND
2
GND
R128
3
R_BIAS1
4
VDDA
5
V_TUNE1
6
C139 VDDA
7
TCXO
8
VDDA
9
VDDA
C141 C142 C143 C144
10
RX_Q_P RX_QP
11
RX_Q_N RX_QN
12
RX_I_P
RX_IP
13
RX_I_N
RX_IN
14
SSBDT_RTR
SSBDT
C145 C146 C147 C148
L127
VREG_MSMP_2.6V
C150 C151
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C101
L101
C191
C192
PAM101
C118
26 4 C119
VBATT RX4
5
RX3
10 6
WCDMA1 RX2
21 7
DCS|PCS_IN RX1
23
GSM_IN
R115
2
MODE
27 3
BS2 RSVD
28 1
BS1 _TXEN
25
VAPC
29 GND
C111
GSM_PA_EN
GSM_ANT_SEL2_N
R123
TX_I_P
C133
C134
R124
TX_I_N
C135
C160
C161 C162 C163 C164
C159
C156
42
DA_LB2_OUT
41
VDDA
40
PWD_DET_IN
39
DCS_INN
38
DCS_INP
37
U104
GPCS_INN
36
GPCS_INP
35
WMIX_LNN
34
WMIX_LNP
33
EGSM_INN
32
EGSM_INP
31
GCELL_INP
30
GCELL_INN
29
WLNA_OUT
R132
TA100 C153 C154
R131
C149
C152
9-35
Flow Chart of Troubleshooting
F102
L102
BAL1 9 C193
1 IN1
8
OUT1
BAL2 7
4 IN2
6 C196
OUT2
L103
G G G G
2 3 5 10
L112
F103
L110
C120
9
BAL1 L113
1
IN1
OUT1 8
7
BAL2
4
L115
IN2
OUT2 6 C121
L111
G G G G
2 3 5 10
L116
VREG_RF_SMPS
C123
U102
1 A VCC 6
U103
2 B NC 5 1 NC VCC 6
3 4 2 NC 5
GND Y A
C122
3 Y 4
GND
C165 C166
R133
VREG_RF_SMPS
UMTS850_TX
PWR_DET
GSM1800_RX_N
GSM1800_RX_P
GSM1900_RX_N
GSM1900_RX_P
GSM900_RX_N
GSM900_RX_P
GSM850_RX_N
GSM850_RX_P
GSM1900_RX_P
GSM1900_RX_N
GSM1800_RX_P
GSM1800_RX_N
GSM850_RX_P
L114
GSM850_RX_N
GSM900_RX_P
L117
GSM900_RX_N
C124