LG CU920 - Checking Front-End Module Block

LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4.6 Checking Front-End Module Block
C113
33p
R109 1K
0.1uF
C112
R111 1K
1KR112
R108 1K
NC
15
UMTS1
UMTS2
16
14
VC1
VC2
13
12
VC3
VC4
11
10
VDD
21
GND5
23
GND6
24
26
GND7
27
GND8
GND9
28
GSM1800RX1
1
2
GSM1800RX2
GSM1800_1900TX
22
GSM1900RX1
3
4
GSM1900RX2
7
GSM850RX1
GSM850RX2
8
25
GSM850_900TX
GSM900RX1
5
6
GSM900RX2
17
LMSP4LMA-573TEMP
FL100
19
ANT
GND1
9
GND2
18
20
GND3
GND4
15nHL109
VREG_RF_SMPS
ANT_SEL2
ANT_SEL0
ANT_SEL1
ANT_SEL3
Fig. 4.6.1 Schematic of the Front-End Module Block
ANT_SEL
ANT_SEL
0
ANT_SEL
ANT_SEL
1
ANT_SEL
ANT_SEL
2
ANT_SEL
ANT_SEL
3
TP1
TP1
Fig. 4.6.2 Test Point of the Front-End Module Block
TP1