Samsung SGH-P520 Service Manual page 38

GSM_PAM_IN
DPCS_PAM_IN
RF_EN
PCS_LNA_IN_P
PCS_LNA_IN_N
DCS_LNA_IN_P
DCS_LNA_IN_N
GSM_LNA_IN_P
GSM_LNA_IN_N
C130
AFC
R104
C134
VCCD_1.8V_IO
VLDO1_1.5V
R315
R314
R316
C329
VRF_2.9V_REG
C100
VRF_2.9V
16
18 17 15 14 13 12
_PDN
19
RFIPP
20
RFIPN
21
RFIDP
22
U101
RFIDN
23
RFIEP
24
RFIEN
25
RFIAP
26
RFIAN
27
GND
28
VRF_2.9V VRF_2.9V_REG
C132 C133
C135
VCCD_1.8V
V_BATT
12
OUT1
11
EN1
10
PGOOD
9
L301
VIN
8
7
_FPWM
C327
C328
R100
C101
VCCD_2.9V
C106 C107
11
C112
VIO
10
_RES
9
XOUT
8
BIP
7
BIN
6
BQP
5
BQN
4
SCLK
3
SDIO
2
_SEN
1
C125 C126
C131
4
3
1
2
OSC100
VHP_CORE_1.6V
U302
1
OUT2
2
EN2
3
L300
AVIN
4
SW2
5
SW1
AGND
6
PGND
C325
13
10-3
Flow Chart of Troubleshooting
PAM_VRAMP
VAPC
R101
C113
R102 C115
RTX_I_P
RTX_I_N
C117
RTX_Q_P
RTX_Q_N
SBCK
SBDT
SBLE
C127
XOENA
ZD302
VCCD_1.8V_IO
VLDO1_1.5V
C326
CLK13M_TR
CLK13M_MC
CLK13M_YMU