3. TROUBLE SHOOTING
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3.7.4.3 Checking RF signal path
L1102
DNI
C1103
3.3n
C1104
8p
GND1
HI-BAND
COMMOM
GND3
GND2
LO-BAND
FL10062
4
3
5
2
6
1
DNI
L110
4
DNI
L1110
C1101
33p
C1105
2.2n
IN
Termination_Port
GND1
GND2
OUT
Coupling
FL1100
6
3
5
2
4
1
R1100
51
TOL=0.01
2
1
L1701
DNI
C1701
DNI
DNI
L170
9
33p
C1711
C1712
33p
DNI
C1714
+VPA_BATT0
+1V8_VREG_L10
WTR0_PRX_LB1_IN
15n
L1703
6.8n
C1703
L1702
DNI
ANT
RX
TX
GND1
GND6
GND2
GND5
GND3
GND4
6
1
3
2
9
4
8
5
7
FL1700
18n
L1700
33p
C1700
18n
L1707
3.9p
C1706
7.5n
L1710
PGND
SDATA
RF_OUT
RF_IN
VCC1
VCC2
GND
VBATT
NC
VIO
SCLK
11
5
9
2
1
10
7
3
8
4
6
U1701
RF7920
TP1(C1101)
TP2(C1103)
TP5(L1700)
TP3(C1105)
TP7(C1712)
TP6(L1707)
TP4(C1703)
4. Trouble Shooting
4. 7. LTE RF Part
4 7 4 LTE B20 TX/PRX
4. 7. 4. 3.
Checking RF signal path
4. 7. 4. LTE B20 TX/PRX
Test Point
TP5
TP7
TP4
U1500
U1300
TP6
FL1700
TP3
TP2
TP1
FL1201
FL1700
U1701
Circuit Diagram
FL1100
FL10062
TP1(C1101)
TP2(C1103)
TP4(C1703)
TP5(L1700)
TP5(L1700)
TP3(C1105)
TP5(L1700)
67
67
TP6(L1707)
TP7(C1712)