Samsung SGH-B300 Service Manual page 27

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
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
100NF
10V
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VCCD_2.9V VCCA_2.9V
C300
C302
U300
C317
SAMSUNG Proprietary-Contents may change without notice
VCCD_2.9V
VBAT
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
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
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
VIB_EN
INTRQ
INTRQ
PWR_KEEP
RST
TP300
KEY_COL(2)
3
Q300
1
2
KEY_ROW(4)
10-15
Flow Chart of Troubleshooting
VCCD_2.9V
VCCA_2.9V
VRF_2.9V
VCCD_1.8V
C308 C309
C311 C312 C313
C315
VRTC_3V
C314 C310