LG KU250 Service Manual - Page 78
Checking Front-End Module Block
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4. TROUBLE SHOOTING 4.5 Checking Front-End Module Block VREG_RF_SMPS Rev.B L108 Rev.D 15nH C117 10p TP1 U500 Rev.C ANT 11 19 VDD 7 8 GND1 GND2 10 GND3 12 GND4 13 GND5 15 17 GND6 20 GND7 21 GND8 23 GND9 GND10 GSM900_RX1 5 6 GSM900_RX2 1 GSM1800_RX1 2 GSM1800_RX2 3 GSM1900_RX1 GSM1900_RX2 4 WCDMA2100 9 D5011 CTRL1 18 CTRL2 22 16 GSM900_TX 14 GSM18001900_TX 1K 1K R100 R101 ANT_SEL0 ANT_SEL1 C110 C109 33p 33p Schematic of the Front-End Module Block TP1 ANT_SEL0 ANT_SEL1 Test Point of the Front-End Module Block - 79 -
4. TROUBLE SHOOTING
- 79 -
4.5 Checking Front-End Module Block
Rev.D
Rev.B
Rev.C
R101
1K
R100
1K
L108
15nH
C117
10p
C110
33p
21
14
GSM18001900_TX
GSM1800_RX1
1
GSM1800_RX2
2
GSM1900_RX1
3
4
GSM1900_RX2
GSM900_RX1
5
6
GSM900_RX2
16
GSM900_TX
VDD
19
WCDMA2100
9
ANT
11
CTRL1
18
CTRL2
22
7
GND1
GND10
23
GND2
8
GND3
10
GND4
12
GND5
13
15
GND6
17
GND7
GND8
20
GND9
U500
D5011
33p
C109
VREG_RF_SMPS
ANT_SEL1
ANT_SEL0
ANT_SEL0
ANT_SEL1
TP1
Schematic of the Front-End Module Block
Test Point of the Front-End Module Block
TP1