4. TROUBLE SHOOTING
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4. TROUBLE SHOOTING
4.13 Power on Trouble – LTE Booting Trouble
TP1
TP3
TP2
TP4
TP6
TP5
TP5
0
R509
R529
0
R510
0
0
R514
SYS_PWR
R518
0
4.7u C508
1V2_CORE
220u
C509
100u
C510
47u
C511
2.2u
C507
2.2u
C506
2.2u
C505
4.7u
C514
3V3_USB
2V5_RF
1V2_TX_PLL
1V2_RX_PLL
2V8_TCXO
2V8_LNA
2V6_IO
1u
C530
1u
C529
1u
C528
1u
C527
1u
C525
1u
C524
0
R524
0
R522
0
R516
0
R512
SYS_PWR
1V8_MEM
SYS_PWR
10u
C518
100n
C519
R532
0
10K
R521
2.2u
C522
2.2u
C523
10K
R525
10K
R523
10u
C512
100n
C513
1u
L504
LQM2HPN1R0MG0
1u
L503
LQM2HPN1R0MG0
U501
LP8725-B
F4
E5
E1
B1
F3
B5
C5
F5
F1
2F
A5
D5
C2
B2
C1
E2
3
D
C3
A1
C4
B3
A3
D4
E3
D2
B4
E4
2
A
1
D
A4
VIN_LILO2
2
NI
V
3
NI
V
FB1
FB2
DEFSEL
EN_PWR_ON
SCL
LILO2
B2_EN_PS_HOLD
SDA
LDO4
RESET_N
D
N
G
CONFIG
LDO3
LDO3_EN
DVS
VINB1
GNDB2
1
NI
V
LDO1
GNDB1
VINB2
SW2
LILO1
LDO5
LDO2
SW1
VIN_LILO1
1u
C526
10K
R530
2V6_IO
DNI
R519
R520
DNI
TCXO_ON
RESET_OUT_N
LTE_RESET_N
I2C_SCL
I2C_SDA
PERST_N
PERST_N
TP1
U504
RP109L131D
5
3
2
4
1
VOUT
VDD
GND
CE
D
N
G
P
U503
RP104K281D-TR-F
5
3
2
4
1
VOUT
VDD
GND
CE_NC
D
N
G
P
0
R526
2V8_RF
1u
C532
K0
1
72
5
R
u1
13
5
C
SYS_PWR
1V5_DCDC
1u
C537
1u
C538
0
R533
1V3_BBPLL
RF_HKP_EN
TP2
TP3
TP4
TP6
TP5