Checking Ant. Sw Module Block - LG U830 KU830 Service Manual

4.4 Checking Ant. SW Module Block

VREG_RFRX_0_2.85V
C502
10p
ANT_SEL0
ANT_SEL1
ANT_SEL1
Logic Table of the Antenna Switch
Schematic of the Antenna Switch Block
TP1
ANT_SEL0
C503
0.1u
C506 C507
100p 100p
- 81 -
4. TROUBLE SHOOTING
19 7
VDD GSM850_RX1
8
GSM850_RX2
18 5
CTRL1 GSM900_RX1
22 6
CTRL2 GSM900_RX2
1
GSM1800_RX1
2
GSM1800_RX2
10 3
GND1 GSM1900_RX1
12 4
GND2 GSM1900_RX2
13 9
GND3 WCDMA2100
15
GND4
17
DGM085M01
GND5
20
GND6
21 16
GND7 GSM850900_TX
23 14
GND8 GSM18001900_TX
ANT_SEL0
TP1
ANT_SEL1
FEM