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4. TROUBLE SHOOTING
(2) Checking Mobile SW & FEM
TEST POINT
CIRCUIT
TP502
TP503
R503
1p
R506
22nH
Change P/N
SW501
RF-650
C518
22p
GND6
10
GND5
9
GND4
7
GND3
5
GND2
4
GND1
2V75_VVCXO
2
VCTRL3
20
VCTRL2
21
VCTRL1
22
VDD
3
C534
0.1u
C543
C544
39p
39p
LGE Internal Use Only
SW501.ANT
SW501.RF
C543
Vctrl 1
C544
Vctrl 2
C545
L501
2.7nH
C513
C514
0.5p
NA
L502
5.6nH
L503
C520
2.7p
NA
FL501
YGHF-S006A
11
TX2G
8
TX1G
6
PCS_RX+
13
PCS_RX-
12
DCS_RX+
15
DCS_RX-
14
EGSM_RX+
17
EGSM_RX-
16
GSM_RX+
19
GMS_RX-
18
R516
100ohm
ANT_SW1
R517
100ohm
ANT_SW2
R518
100ohm
ANT_SW3
C545
39p
SW501
FL501
Vctrl 3
WAVEFORM
EGSM RX
Graph 4.2.2 FEM Control Signal
Copyright © 2007 LG Electronics. Inc. All right reserved.
- 42 -
Vdd (C534)
/ Tx
Vctrl 1
Vctrl 2
Vctrl 3
Only for training and service purposes
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