Checking Front End Module Block - LG TU750 Service Manual

4.18 Checking Front End Module Block

Antenna
Switch Module
(+ GSM/EDGE PA)
Figure 4-11-1. Front End Module Block (Bottom and Top)
RX1
16
RX2
15
RX3
14
RX4
13
RSVD
10
MODE
9
_TXEN
8
ANT
17
Figure 4-11-2. Schematic (Antenna Switch Module + GSM/EDGE PA)
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
24
GND6
23
U102 GND5
22
GND4
21
GND3
SKY77521
12
GND2
11
GND1
2
LB_RF_IN
3
HB_RF_IN
1
BS2
6
BS1
7
C124 C125
22p 22p
- 141 -
Antsw3
GTX_850_900
GTX_1800_1900
C126 C127
22p 22p
4. TROUBLE SHOOTING
TP01
Antsw0
Antsw1
Antsw2
ANTSW2
ANTSW1
TP01
TP01
ANTSW0
ANTSW3
LGE Internal Use Only