Checking Front-End Module Block - LG U370 Service Manual

4. TROUBLE SHOOTING

4.5 Checking Front-End Module Block

TP1
VREG_RF_SMPS
TP2
ANT_SEL0
ANT_SEL1
TP3
TP2
TP3
LGE Internal Use Only
C111
47p
C122 C123
NA 15p
Schematic of the Front-End Module Block
TP1
U100
Test Point of the Front-End Module Block
19
VDD GSM900_RX1
GSM900_RX2
GSM1800_RX1
GSM1800_RX2
7
GND1 GSM1900_RX1
8
GND2 GSM1900_RX2
10
GND3 WCDMA2100
12
GND4
13
GND5
15
GND6
17
GND7 D5011
20
GND8
21
GND9 GSM900_TX
23
GND10 GSM18001900_TX
FL102
Copyright © 2007 LG Electronics. Inc. All right reserved.
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5
6
1
2
3
4
9
18
CTRL1
22
CTRL2
16
14
Only for training and service purposes