LG KE990 Service Manual - Page 84
FL100
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4. TROUBLE SHOOTING 4.4 Checking Front-End Module Block ANT 11 ANT_SEL0 ANT_SEL1 VREG_RF_SMPS TP1 TP2 TP3 C113 C114 1000p 1000p C195 1000p 19 20 VC1 VC2 21 VDD 9 GND1 10 GND2 12 GND3 13 GND4 14 GND5 16 GND6 18 22 GND7 GND8 NC2 24 NC1 23 GSM850_RX1 1 2 GSM850_RX2 3 GSM900_RX1 4 GSM900_RX2 5 GSM1800_RX1 GSM1800_RX2 6 GSM1900_RX1 7 GSM1900_RX2 8 GSM1800_1900_TX 15 17 GSM850_900_TX LMSP43QA-538 FL100 Schematic of the Front-End Module Block TP3 TP2 TP1 Test Point of Front-End Module Block Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 85 - LGE Internal Use Only
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 85 -
4.4 Checking Front-End Module Block
1000p
C114
1000p
C195
15
5
GSM1800_RX1
GSM1800_RX2
6
7
GSM1900_RX1
GSM1900_RX2
8
17
GSM850_900_TX
1
GSM850_RX1
GSM850_RX2
2
3
GSM900_RX1
GSM900_RX2
4
NC1
23
NC2
24
VC1
19
20
VC2
VDD
21
ANT
11
9
GND1
10
GND2
GND3
12
13
GND4
14
GND5
16
GND6
GND7
18
GND8
22
GSM1800_1900_TX
FL100
LMSP43QA-538
C113
1000p
ANT_SEL1
ANT_SEL0
VREG_RF_SMPS
Schematic of the Front-End Module Block
TP2
TP1
TP3
Test Point of Front-End Module Block
TP1
TP3
TP2