Samsung SGH-B300 Service Manual page 14

Flow Chart of Troubleshooting
C213
R108
R111
CP_WEN
R107 C131
U101
R106 C130
ANT
GSM_RX
GSM_TX
DCS_RX
DCS_TX
FM_RADIO
SPK
MAIN_MIC
EAR_SPK
EAR_MIC
POWER_ON
SIM
CHARGING
LCD
MOT
CLK VCCD_2.9V
C302
DSP_DB(0:15)
DSP_DB(15)
D2 DB15
DSP_DB(14)
D3 DB14
DSP_DB(13)
E3 DB13
DSP_DB(12)
E2 DB12
DSP_DB(11)
F3 DB11
DSP_DB(10)
F2 DB10
DSP_DB(9)
F1 DB9
DSP_DB(8)
F4 DB8
DSP_DB(7) G4
DB7
DSP_DB(6)
G3 DB6
DSP_AB(0:8)
DSP_DB(5)
H5
DB5
DSP_DB(4)
J6
DB4
DSP_DB(3)
J5 DB3
DSP_DB(2)
K3
DB2
DSP_DB(1)
K2 DB1
DSP_DB(0)
K1
DB0
DSP_AB(8)
K5 AB8
DSP_AB(7)
K7 AB7
DSP_AB(6) M1
AB6
DSP_AB(5)
M2 AB5
DSP_AB(4) N2
AB4
DSP_AB(3)
N1 AB3
DSP_AB(2) L5
AB2
DSP_AB(1) P1
AB1
DSP_AB(0) K6
AB0
DSP_IO L3
I|O
DSP_IO
L2
RWN
DSP_RWN
R3
RESETN_CSP
FLASH_RESET
E6 NC4
C5
OCTL1
BAND_SEL1
F5 OCTL2
BAND_SEL2
E5 NC
A4 OCTL4
FM_EN
G6 OCTL5
VMOD_EN
B3 OCTL6
A3 OCTL7
TX_EN
B1 SERLE1
A2
SERLE2
SERLE
C1
SERDA
SERDAT
C2
SERCK
SERCLK
C316
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C118
VCCA_2.9V VCCD_2.9V
VBAT
C300
C301
C303 C319
VDD34 C11
VDD12 J13
UP_CLK N9
SIMCLK VCCB_2.9V
UP_RST R10
SIMRST
UP_IO P10
SIMDATA
SIM_IO J11
SIM_IO
SIM_RST K11
SIM_RST
SIM_CLK K14
SIM_CLK
VSIM K12
VSIM
VRTC H11
LED2_DRV G12
LED1_DRV G13
KEY_BL1
RING_DRV F13
VIB_DRV F15
VIB_DRV
VLDO_7 C12
VLDO_6 A14
C9
VL5S_B
VL5S_A D10
C318
U300 VLDO_5 B10
VL4S_B B11
VL4S_A A12
VLDO_4 B12
VLDO_3 A13
VLDO_2 J12
VLDO_1 G11
VACC F14
K8
CSN_PSC UP_CS
SCLK_PSC L8
UP_SCLK C308
SDO_PSC N7
UP_SDO
M7
SDI_PSC
UP_SDI
VEXT E14
VBAT E13
VBAT
CH_BDRV E11
CH_ISEN F12
D14
CH_RES
NC3 D15
NC9 E10
VREF A10
VREF
E9
CREF
RTC_ALMN H10
RTCALARM
C315
VIB_EN
INTRQ
INTRQ
PWR_KEEP
RST
TP300
KEY_COL(2)
3
1 Q300
C317
2
KEY_ROW(4)
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L108
C103
R430
C134
R101
C407
C135
C102
C116
C114
C117
C107 R102
C314
R103
C110
C308
L105
C309
VCCD_2.9V
VCCA_2.9V VRTC_3V
VRF_2.9V VCCD_1.8V
C309 C 3 1 1 C312 C313 C314 C 3 1 0
26M_OUT
R101
AFC
C102
C103
VBAT
C105
C106
R102 C107
DPCS_PAM_IN
R103
C110
GSM_PAM_IN
L101 L106 C115 C117 C114
L105
SERCLK
SERDAT
VRF_2.9V
L110
C134
C133
R108 C132
L108
26M_OUT
R111
C135
10-2
C300 R211
C313
C310
C206
VRF_2.9V
OSC101
4
3
1
2
C100 C101
RTXQN
RTXQP
VCCD_2.9V
RX1900B PCS1900_LNA_IN_P
VLDO2
PCS1900_LNA_IN_N
RX1900
VLDO1
RX1800B
DCS1800_LNA_IN_P
U100
VBAT
RX1800 DCS1800_LNA_IN_N
VDD
RX900B
GSM900_LNA_IN_P
VCC_TXVCO
RX900 GSM900_LNA_IN_N
TXOP_HI
RX850B GSM850_LNA_IN_P
TXOP_LO
RX850 GSM850_LNA_IN_N
VLDO3
GND
C116
SERLE C118
RTXIN
RTXIP
U101
9 8
C130
R106
CLK13M_TR
1 7
_SD CP
2 6
C131
_RD D R107
3 5
Q _Q CLK13M_MC
4
R109
R110
CLK13M_YMU
Q300
C104