LG -D722V Service Manual page 78

4. 7. LTE RF Part
4. 7. 4. LTE B20 TX/PRX 4 7 4 LTE B20 TX/PRX
3.7.4.3 Checking RF signal path
4. 7. 4. 3. Checking RF signal path
Test Point
TP5
TP4
TP3
TP2
TP1
Circuit Diagram
TP1(C1101)
33p
C1101
TP4(C1703)
TP4(C1703)
C1703
6.8n
L1703
L1702
DNI 15n
67
LGE Internal Use Only
U1300
FL1100
TP1(C1101)
FL1100
4 3
Termination_Port OUT
TP2(C1103)
5 2
GND2 GND1
6 1
Coupling IN
1 2
C1700
33p
FL1700
6 1
ANT RX
3
TX
2 9
GND1 GND6
4 8
GND2 GND5
5 7
GND3 GND4
4. Trouble Shooting
FL1700 FL1700
FL1201
FL10062
FL10062
1
GND1
C1103 3.3n 2
COMMOM
3
GND2
TP2(C1103)
TP5(L1700)
TP5(L1700)
TP5(L1700)
L1700 18n
WTR0_PRX_LB1_IN
TP5(L1700)
SCLK
C1701 DNI
6
GND
7
NC
C1706
TP6(L1707)
8
RF_OUT
9
3.9p
VCC2
10
PGND
L1710
11
L1707
67
18n
7.5n
TP6(L1707)
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3. TROUBLE SHOOTING
U1500
U1701
6 C1104 8p
HI-BAND
5
GND3
4
LO-BAND
TP3(C1105)
C1105
2.2n
+VPA_BATT0
+1V8_VREG_L10
SDATA
5
VIO
4
U1701
VBATT
C1711 33p
3
RF7920
RF_IN
2
VCC1
1
TP7(C1712)
C1714
DNI
Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TP7
TP6
TP3(C1105)
C1712 33p
TP7(C1712)