LG KE820 - Language; Connectivity; Bluetooth

5. Trouble shooting
- 102 -
5.12.5 Checking Mobile SW & FEM
Circuit Diagram
L408
2.7nH
0.1u
C437
R406
0
ANT
G1
G2
RF
SW401
KMS-506
C404
100p
2V85_RF
10p
C462
6
TX2G
8
VCTRL1
22 21
VCTRL2
20
VCTRL3
3
VDD
EGSM_RX-
18
GMS_RX-
2
GND1
25
GND10
GND11
26
4
GND2 GND3
5 7
GND4 GND5
9 10
GND6
11
GND7
GND8
23
GND9
24
GSM_RX+
19
PCS_RX+
13 12
PCS_RX- TX1G
FL308 YGHF-S006A
ANT
1
DCS_RX+
15 14
DCS_RX- EGSM_RX+
17 16
Checking Points
FL30
SW40
R403
R405
R441
R40
Figure 10. Mobile SW & FEM Circuit
Figure 11 Mobile SW &
Table 2. FEM RX Control Logic
RX Mode EGSM DCS PCS
ANT_SW1 Off Off Off
ANT_SW2 On Off Off
ANT_SW3 Off On Off