Samsung SGH-U900 Service Manual page 66

ATT. 7.7dB
R100
DPCS_TX_OUT
R102
ATT. 7.7dB
F102
1
GSM_TX_OUT
IN
R104
G G
2 3
R107 R108
VRF_2.1V
C228 C234 C229
C233 C227
VRF_2.7V
RTR_TCXO
C239
C241 C245 C242 C246
C240 C244
VRF_2.1V
R210
R211
TA200 C253 C259
VBAT
C105 C106 TA100
UMTS_ANT
R103
ANT_SEL1_N
ANT_SEL0_N
C111
4
OUT
VAPC
G
5
ANT_SEL2_N
C213 C214
C224
close to pin68
R206
C235
ground
ground
1
VDDA2
2
TCXO
3
VDDA1
4
VDDA1
5
VTUNE1
6
VDDA1
7
VDDA2
8
U200
NC
9
RTR6280
NC
10
VDDA1
11
RX_Q_P
PRX_QP
12
RX_Q_N
PRX_QN
13 8X8X0.9T
RX_I_N
PRX_IN
14
RX_I_P
PRX_IP
15
NC
16
NC
17
NC
SBDT
C256
TA201 C254 C260 C255 C261
VRF_2.7V
C262
C263 C264
C266 C267
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C100
L101
C104
26 4
VBATT RX4
5
RX3
10 6
WCDMA1 RX2
21 7
DCS|PCS_IN RX1
PAM100
23
R101
GSM_IN
2
MODE
SKY77519-11
27 3
BS2 RSVD
28 1
BS1 _TXEN
25
VAPC
29 GND
C112
R105
R106
C114
C115
R205
C215 C220
C219
UMTS_TX
C223
DPCS_TX_OUT
C225
VRF_2.7V
GSM_TX_OUT
C232
C226
RTR_PWR_DET
C269
33PF
C238
51
GCELL_INN
50
GCELL_INP
49
GSM_RX_N
EGSM_INN
48
EGSM_INP GSM_RX_P
47
DCS_RX_N
DCS_INN
46
DCS_RX_P
DCS_INP
45
PCS_RX_N
GPCS_INN
44
PCS_RX_P
GPCS_INP
43
NC
42
NC
41 C247
NC
40
NC
39
NC
38
WPRXSE1
37
NC
36
UMTS_RX
WPRXSE2
35
WPRXSE1_OUT
C248 C249
C250
C252
C257
R212
VMSMB_2.6V
C265
10-24
Flow Chart of Troubleshooting
RFS100
C101
L100
C102
C107
F100
C108
3
OUT
1
IN
4
OUT L103
G G
C109
2 5
L102
39nH
F101 L104
C110
3
OUT
1
IN
4
L106
OUT
G G
L105
2 5
F103
L107
C113 3
OUT
1 4
OUT
IN
L109
G G
L108
2 5
VRF_2.1V
C216 C221 C217 C222 C218
VRF_2.1V
L209
F201
3
OUT
1
L208
IN
4
OUT
2 G G
5
L210
ANT101
1 2
C103
GSM_RX_N
GSM_RX_P
DCS_RX_N
DCS_RX_P
PCS_RX_N
PCS_RX_P
UMTS_RX_N
UMTS_RX_P