Samsung SGH-G400 Service Manual page 65

Flow Chart of Troubleshooting
VREG_RFRX1_2.1V
R102
VREG_RFRX2_2.7V
C124
C125
C126 C127
VREG_RFRX1_2.1V
3
ANT_JTAG
G
2 G G 4
RFIN
ANT101
1
L113
C138
C183
R106
DCS1800_PCS1900_TX
R107 R108
F104
R111
1 4
OUT
GSM_TX IN
G G G
2 3 5
R112 R113
TX_QP
C101
TX_QM
TX_IP
C102
TX_IM
DAC_REF
C116 C117 C118 C119 C120
1
VDDA2
2
RTR6280_TCXO TCXO
3
VDDA1
4
VDDA1
C123 5
VTUNE1
6
VDDA1
7
VDDA2
8
NC
9
NC
10
C128 C129 C130 C131 NC
11
RX_QP PRX_QP
12
RX_QM PRX_QN
13
RX_IM PRX_IN
14
RX_IP PRX_IP
15
NC
16
NC
17
NC
R103
R104
C141 C142
C147 C148 C149 C150
C154
RFS101
C134
L101 C140
VBATT
TA101
C157 C158
MOD101
26
VBATT
C179
10
UMTS_TX_RX WCDMA1
21
DCS|PCS_IN
23
GSM_IN
27
BS2
GSM_ANT_SEL1
28
BS1
GSM_ANT_SEL0
29 GND
C165 C166
R114
GSM_PA_PWR_CTL
GSM_ANT_SEL2
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C104
C103 C105
C113
C112 C114
C115
R101
C178
PWR_DET
51
GCELL_INN
50
GCELL_INP
49
EGSM_INN
48
EGSM_INP
47
DCS_INN
46
DCS_INP
45
GPCS_INN
U101
44
GPCS_INP
43
NC
42
NC
41
NC
40
NC
39
NC
C132
38
WPRXSE1
37
NC
36
WPRXSE2
35
WPRXSE1_OUT
C137
R105 L104
C151
C155
C152 C153
C160 C161
4 C159 1
RX4 IN
5
RX3
6
RX2
7
RX1
2
MODE
3
RSVD
1
_TXEN
25
VAPC
R110
C167
C171 1
IN
C174
C177
9-30
VREG_RFRX1_2.1V
C106 C108 C110 C111
C107 C109
UMTS2100_TX
DCS1800_PCS1900_TX
GSM_TX
VREG_RFRX2_2.7V
C121 C122
GSM_RXM
GSM_RXP
DCS_RXM
DCS_RXP
PCS_RXM
PCS_RXP
UMTS2100_RX
C136
F101
WCDMA_HB_MIX_IN_M
3
OUT
1 L102
IN
OUT 4
G G
C144
L103 2 5
WCDMA_HB_MIX_IN_P
VREG_RFRX1_2.1V
VREG_MSMP_2.6V
C162
L109
F102
L106
L105
3
OUT
L110
4
OUT
G G
2 5
F103
C164
OUT 3
4
G G OUT
L107 C180
2 5
C169
L111
F105
3
C181 C182
OUT
4
OUT
G G
L112
2 5
GSM_RXM
GSM_RXP
DCS_RXM
DCS_RXP
PCS_RXM
PCS_RXP