Samsung SGH-A737 Service Manual page 68

Flow Chart of Troubleshooting
F201
C202
1
UMTS850_TX
IN
G G G
2 3 5
PA_ON1
C206
PA_R1
C207
C209
PA_ON2
F202
C211
1 3
UMTS1900_TX IN OUT
GND1 GND2
2 4
UMTS850_RX_P
L212
L211
L213
L214
UMTS850_RX_N
UMTS1900_RX_P
C233
L215
L216
C235
UMTS1900_RX_N
VBATT
C205
C204
C203
PAM201
1 VEN_CELL 14
GND
2 13
RFIN_CELL
RFOUT_CELL
3 12
VMODE1
VCC
4 11
VBATT VCCA
5 10
GND
VMODE2
6 RFIN_PCS 9
GND
7 RFOUT_PCS 8
VEN_PCS
GND
15
C212
VREG_RF_SMPS
C259
F205
C231
9
BAL1
IN1 1
VREG_RF_SMPS
8 OUT1
C232
7 BAL2
4
IN2
6
OUT2
G G G G
10 5 3 2
C234
C236
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U201
F203
C220
1 TX
1 2
IN OUT
COUP 50OHM
L201
4 3
C221
2 4 5 7 8 9
R202
R201
PWR_DET_UMTS850
C266
F204
U202
L204
L223
1 2
1
IN OUT
COUP 50OHM
4 3
C267 C213 C214
R203
C268
PWR_DET_UMTS850
PWR_DET
R205 R204
R218
C262 C263 C265
C264
C260 C261
R219
1
NC
2
R_BIAS
3
VDDA
4
UMTS850_RX_N LB_INM
5
UMTS850_RX_P U203
LB_INP
6
UMTS1900_RX_N
HB_INM
7
UMTS1900_RX_P
HB_INP
8
VDDA
C237 9
L218
HB_LNA_OUT
10
LB_LNA_OUT
11
VDDA
12
C238
NC
L219 R211
R213
L220
C239 C240
R212
L221
C241
L222
C242
9-34
C222
UMTS_850
L202
6 B7637
C223
ANT L203
RX 3
UMTS_RX_850
C224
C215
UMTS_1900
C216
C218
3 L205
ANT
2
TX RX
UMTS_RX_1900
GND
C219
4
C257
R217
C258
C256
R216
C250 C251 C252 C253 C254
C249
R215
36
VDDA 35
GPS_PLNA_OUT
34
C248
BLANK
33
R_BIAS_GPS C247
32
GPS_PLNA_IN
31
VDDA
30
GRX_IM 29
GRX_IP
28
GRX_QP
27
C246
GRX_QM
26
VDDA
25
VDDM
C243
R214
VREG_MSMP_2.6V
VREG_RF_SMPS
C244 C245
VREG_RF_SMPS