LG CU920 Manual page 102

4. TROUBLE SHOOTING
4.8.3 Checking Rx Block
1. TP1 : GSM850 Rx Balance Input
2. TP2 : GSM900 Rx Balance Input
3. TP3 : PCS Rx Balance Input
4. TP4 : DCS Rx Balance Input
C100 56p
C102
56nH
FL100
LMSP4LMA-573TEMP
14
VC1 GSM1800RX1
13
VC2 GSM1800RX2
12
VC3 GSM1900RX1
11
VC4 GSM1900RX2
GSM900RX1
10
VDD GSM900RX2
GSM850RX1
9
GND1 GSM850RX2
18
GND2
20
GND3 UMTS1
21
GND4 UMTS2
23
GND5
24
GND6 GSM1800_1900TX
26
GND7 GSM850_900TX
27
GND8
28
GND9 NC
LGE Internal Use Only
TP1 TP2 TP4 TP3
Fig. 4.8.3.1 Test point of the GSM RX Block
1
2
3
4
5
6
7
8
15
16
22
25
17
Fig. 4.8.3.2 Schematic of the GSM RX Block
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TP3 L101
NA
L107
TP4
2.7nH
TP1 L113
NA
L119
TP2
18nH
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
L100
4.7nH
L102
NA
L104
4.7nH
L106
3.3nH
L108
18nH
L110
3.3nH
L111
27nH
L114
68nH
L116
27nH
L118
22nH
L120
47nH
L121
22nH