LG -E435 Service Manual page 39

R1011
DCS_PCS_TX
47
DCS(1710-1785 MHz)
7dB
PCS(1850-1910 MHz)
R1006
GSM850_GSM900_TX
75
GSM850(824-849MHz)
GSM900(880-915MHz)
11dB
Antenna Switch Module logic(SkY77584)
STAND-BY
GTX_LB
GTX_HB
GRX_LB
GRX_HB
WTRX_HB
WTRX_LB
LGE Internal Use Only
PGND16
PGND15
PGND14
1
GND1 PGND13
2
GND2
3
GND3
4
GND4
5
GND5 GND10
6
U1001
GND6 TRX3
7
GND7 TRX2
8
GND8 TRX1
VRAMP
TXEN
29
PGND1 MODE
30
PGND2 GND9
31
PGND3
32
PGND4
33
PGND5
34
PGND6 PGND12
PGND11
PGND10
VBAT
2mm
C1039
C1118
6.8p 100p
C1125 C1124
DNI DNI
Schematic of the Antenna Switch Block
ANT_SEL 0
LOW
LOW
LOW
HIGH
HIGH
HIGH
LOW
W850_W900_RTX
W1900_W2100_RTX
C1022 1.2n
44
43
42
41
22
21
20
19
18
17
16
15
C1046
100p
40
39
38
TP1
C1038
10u
ANT_SEL1
ANT_SEL2
ANT_SEL 1 ANT_SEL 2
LOW
LOW
HIGH
LOW
HIGH
LOW
HIGH
- 39 - Copyright © 2013 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
RX_PCS_P
1
GSM1800/1900_IN GSM1900_Bal_OUT2
2
GND1 GSM1900_Bal_OUT1
RX_PCS_M
3
GND2 GSM1800_Bal_OUT2
L1004
4.7n
4
GND3 GSM1800_Bal_OUT1
FL1002
1
GSM850/900_IN GSM900_Bal_OUT2
2
GND1 GSM900_Bal_OUT1
3
GND2 GSM850_Bal_OUT2
L1009
8.2n
4
GND3 GSM850_Bal_OUT1
FL1001
R1002
GSM_PA_RAMP
2.2K
C1047
39p
GSM_PA_EN
ANT_SEL0
C1126 C1123
DNI DNI
Tx_EN
LOW LOW
HIGH HIGH
HIGH HIGH
LOW LOW
LOW LOW
HIGH LOW
LOW LOW
Only for training and service purposes
9
8
7
6
9
8
7
6