Samsung SGH-B300, Service Manual, Page: 27 / 56

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Flow Chart of Troubleshooting
10-15
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ANT
FM_RADIO
DCS_TX
DCS_RX
GSM_TX
GSM_RX
SPK
POWER_ON
EAR_MIC
EAR_SPK
MAIN_MIC
SIM
CHARGING
LCD
MOT
CLK
C311 C310
VCCD_1.8V
TP300
C303
VRTC_3V
C308
VCCD_2.9V
1
3
2
C316
10V
100NF
Q300
C315
VCCB_2.9V
C319
VBAT
VCCD_2.9V
R
2
V
S
S
4
P
6
V
X
V
C
M
R
1
3
X
O
E
N
A
Q
D
1
INTRQ
VLDO_5 B10
VLDO_6 A14
VLDO_7 C12
VREF A10
V
R
E
G
N
R
1
4
V
R
E
G
P
M
13
VRTC H11
VSIM K12
V
S
S
1
G
5
V
S
S
2
K
4
V
S
S
3
V
D
D
_O
C
T
L
C
4
VEXT E14
VIB_DRV F15
VL4S_A A12
VL4S_B B11
VL5S_A D10
C9
VL5S_B
VLDO_1 G11
VLDO_2 J12
VLDO_3 A13
VLDO_4 B12
VDD12 J13
V
D
D
2
M
3
V
D
D
3
N
6
VDD34 C11
V
D
D
5
C
10
V
D
D
67
B
13
V
D
D
B
A
6
V
D
D
D
N
11
V
D
D
V
L1
1
V
D
D
_I
O
1
N
5
V
D
D
_I
O
2
J4
A2
SIM_CLK K14
SIM_IO J11
SIM_RST K11
T
X
P
E
7
UP_CLK N9
UP_IO P10
UP_RST R10
VACC F14
VBAT E13
V
D
D
1
J3
R
X
T
X
IN
D
6
R
X
T
X
IP
D
7
R
X
T
X
Q
N
C
6
R
X
T
X
Q
P
C
7
SCLK_PSC L8
M7
SDI_PSC
SDO_PSC N7
SERCK
C2
C1
SERDA
B1 SERLE1
SERLE2
C
1
4
R
A
R
E
F
1
B
6
R
A
R
E
F
2
B
5
R3
RESETN_CSP
R
E
S
E
T
_
O
K
9
RING_DRV F13
R
S
V
D
L
9
R
S
V
D
2
N
1
0
RTC_ALMN H10
R
T
C
_C
L
K
N
4
RWN L2
NC9 E10
C5
OCTL1
OCTL2
F5
OCTL4
A4
G6
OCTL5
OCTL6
B3
A3
OCTL7
P
S
W
1_
B
U
F
L
7
P
W
R
_
K
E
E
P
M
9
P
W
R
_
S
W
1N
C
1
5
P
W
R
_
S
W
2
M
IC
IN
N
M
14
M
IC
IN
P
N
1
4
M
IC
O
U
T
N
P
1
5
M
IC
O
U
T
P
N
1
5
E5 NC
NC3 D15
NC4 E6
1
N
C
5
N
C
6
2
N
C
7
P
5
N
C
8
D
13
G
N
D
S
9
H
6
G
N
D
V
P
13
G
N
D
_H
C
U
R
F
11
G
N
D
_O
C
T
L
B
4
G
N
D
_P
S
C
1
B
15
G
N
D
_P
S
C
2
K
15
IN
T
R
Q
L1
0
L3
I|O
LED1_DRV G13
LED2_DRV G12
M
C
R
6
G
N
D
S
15
J9
G
N
D
S
16
J1
0
G
N
D
S
17
K
10
G
N
D
S
2
F
8
G
N
D
S
3
F
9
G
N
D
S
4
F
10
G
N
D
S
5
G
7
G
N
D
S
6
G
8
G
N
D
S
7
G
9
G
N
D
S
8
G
1
0
DB9 F1
D
IN
T
R
P
3
G
N
D
B
F
6
G
N
D
D
M
10
G
N
D
Q
E
8
G
N
D
S
1
F
7
G
N
D
S
10
H
7
G
N
D
S
11
H
8
H
9
G
N
D
S
12
G
N
D
S
13
J7
G
N
D
S
14
J8
E2
DB13 E3
DB14 D3
DB15 D2
DB2
K3
J5 DB3
DB4
J6
DB5 H5
DB6 G3
DB7
G4
DB8 F4
D14
E9
CREF
K8
CSN_PSC
D
A
IC
K
R
4
D
A
ID
I
L
6
D
A
ID
O
M
6
D
A
IR
N
P
4
DB0
K1
K2 DB1
DB10 F2
DB11 F3
DB12
A
O
U
T
A
N
N
1
2
A
O
U
T
A
P
P
1
1
A
O
U
T
B
N
P
1
2
A
O
U
T
B
P
R
1
2
A
U
X
IN
N
L1
4
A
U
X
IN
P
M
15
A
U
X
O
U
T
N
L1
3
A
U
X
O
U
T
P
K
1
3
CH_BDRV E11
CH_ISEN F12
CH_RES
AB0
K6
P1
AB1
AB2
L5
N1
AB3
AB4
N2
M2
AB5
AB6
M1
K7
AB7
AB8
K5
A
F
C
D
9
C300
U300
VCCA_2.9V
DSP_IO
VCCD_2.9V
C317
C312
C302
C314
C318
VCCA_2.9V
C309
C313
VBAT
VRF_2.9V
C301
SIMRST
VIB_DRV
VREF
VSIM
RTCALARM
C
LK
_3
2
K
R
T
X
IN
R
T
X
IP
R
T
X
Q
N
R
T
X
Q
P
UP_SCLK
UP_SDI
UP_SDO
SIM_CLK
SIM_IO
SIM_RST
V
A
P
C
SIMCLK
SIMDATA
UP_CS
D
S
P
_
IN
T
INTRQ
KEY_BL1
C
L
K
1
3M
_M
C
M
IC
IN
N
M
IC
IN
P
M
IC
O
U
T
N
M
IC
O
U
T
P
PWR_KEEP
P
W
R
_
O
N
JI
G
_
O
N
RST
VIB_EN
BAND_SEL1
BAND_SEL2
FM_EN
A
F
C
A
O
U
T
A
N
A
O
U
T
A
P
A
O
U
T
B
N
A
O
U
T
B
P
A
U
X
IN
N
A
U
X
IN
P
A
U
X
O
U
T
N
A
U
X
O
U
T
P
TX_EN
VMOD_EN
KEY_COL(2)
KEY_ROW(4)
DSP_AB(0:8)
DSP_AB(8)
DSP_AB(7)
DSP_AB(6)
DSP_AB(5)
DSP_AB(4)
DSP_AB(3)
DSP_AB(2)
DSP_AB(1)
DSP_AB(0)
DSP_IO
DSP_RWN
FLASH_RESET
SERLE
SERDAT
SERCLK
DSP_DB(0:15)
DSP_DB(15)
DSP_DB(14)
DSP_DB(13)
DSP_DB(12)
DSP_DB(11)
DSP_DB(10)
DSP_DB(9)
DSP_DB(8)
DSP_DB(7)
DSP_DB(6)
DSP_DB(5)
DSP_DB(4)
DSP_DB(3)
DSP_DB(2)
DSP_DB(1)
DSP_DB(0)