4. TROUBLE SHOOTING
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Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Schematic of GSM/DCS/PCS Tx Block
SW1002
G1
ANT
G2
L1004
100n
R1001
DNI
DNI
C1001
DNI
L100
3
R1006
82
R1004
91
R1007
82
L100
2
1.5n
R1010
180
VBAT
R1009
33
R1011
180
C1028
39p
R1002
2.2K
C1020
100p
100p
C1019
C1018
100p
100p
C1017
SW1001
4
2
1
3
G1
A
C
G2
U1002
24
17
18
19
13
12
6
5
3
1
2
16
20
15
14
4
22
11
10
9
8
7
23
21
TX_EN
PGND1
GND
GND2
GND3
RX1
RX2
VRAMP
GND5
AN
T
GND6
GPCTRL0
GND7
GND8
GND1
RFIN_L
B
RFIN_H
B
GND4
TRX1
TRX2
GPCTRL1
VBATT
GPCTRL2
PGND2
47p
C1014
C1105
33p
C1104
100p
L1001
1n
C1013
22u
GSM_PA_RAMP
WCDMA_LB_RTX
WCDMA_HB_RTX
ANT_SEL0
ANT_SEL3
DCS_PCS_TX
GSM_TX
ANT_SEL1
ANT_SEL2
GSM900(880-915MHz)
GSM850(824-849MHz)
DCS(1710-1785 MHz)
PCS(1850-1910 MHz)
160
8
5dB
11dB
2mm
TP1
TP2
TP3