Samsung SGH-P270 Service Manual page 20

Flow Chart of Troubleshooting
VCC_RX_TX
RAMP_PAM
C106
GSM_TX
C109
DCS_TX
16
18 17
PON_4220 _PDN
19
PCS_RXP
RFIPP
20
PCS_RXM
RFIPN
21
U100
DCS_RXP
RFIDP
22
DCS_RXM
RFIDN
23
GSM_RXP_900
RFIEP
24
GSM_RXM_900
RFIEN
25
RFIAP
26
RFIAN
27
28
29 30 31 32
VCC_RX_TX
C134
BT_CLK_REQ
D_REF_CLK
VDD_IO_LOW
AVDD_HFA
VCC_KEYLED_3V3
ADV3V
VDD_MEM_CARD_2V9
AVDD
VDD_IO_HIGH
VDD_VIB_3V3
C411 C412 C413 C414
SCL1
SDA1
SIM_OFF
VDD_IO_LOW
IT_PMU
RSTON
VHIGH
R414
CTRL_VREF_3G_B1
BB3G_REF_ON
AUX_ON
ONKEYn
BT_CLK_REQ
VREF_3G_B1
ADV3V
VCC_TX
C432
32KHZ_DIGIT
OSC400
VDD_GSM_CORE
VDD_MEM_3G_CORE
VBAT
VCC_SYN
C100
C101
VDD_IO_LOW
R100
RAMP
C110
10
14 13 12 11
15
BT_CLK_26M
_RES
9
C120
XOUT
BB2G_REF_CLK
8
BIP
7
BIN
6
BQP
5
BQN
4
RF_CLK
SCLK
3
RF_DATA
SDIO
2
_SEN RF_EN
1
C126
R103
35 37 38 39
33 34 36
C131
VCC_RX_TX
C135
C415 C416 C418
C417
B22
SCL
A28
SDA
B14
USIMACT
B15
USIMPRES
B5
INT_N
A16
RSTHC_N
B4
TP400
RSTMEM_N
B9
PWREN1
B8
PWREN2
B7
PWREN3
A8
PWREN4
B6
PWREN5
B16
SHUTDOWN
D5
REC1_N
U400
A56
REC2_N
A20
ONKEY_N
TP401
B10
GPIO1
A11
GPIO2
B11
GPIO3
A12
GPIO4
A14
GPIO5
B12
GPIO6
D6
GPIO56GND
D8
GPO1
A43
GPO2
R421
B25
NC
B35
NC
D4
GPO1VIN
B34
GPO2VIN
B36
NC
B40
NC
B13
CLK32K
A52
OSCI
B41
OSCO
L402
L403
C442 C443 C444
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IRX_TX_P
IRX_TX_N
QRX_TX_P
QRX_TX_N
TCX100
AFC
C136
R104
VBAT VBAT
C401
C420
C423
B38
REFC
A48
REFGND
B39
VINT
A49
VHIGH
VHIGH
C424
B42
NC
D2
NC
D3
NC
D7
NC
A1
VBAT
A2
VBAT
A47
VSAVE
A17
NC
B1
VBATSENSE
C426
A54
VCHG
A55
VCHG
A53
VBUS
D1
SCUSB USB_SUSPEND
A18
NC
R417
B44
CCSET
A30
VINT
A21
NC
A24
NC
B43
VINT
A25
NC
A29
NC
A31
NC
A32
NC
A44
NC
2
NC
3
NC
9-2
VBUS_5V
VDD_USB
VCC_SIM
VCC_SYN
VCC_RX_TX
VDD_PLL
C404 C405 C406 C407
VINT
VBAT
C425
R415
C427
VCHG_5V C428
C429
BAT400
VBUS_5V
C430
VINT